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%{
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/*#define YYDEBUG 1*/
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/*-------------------------------------------------------------------------
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 *
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 * gram.y
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 *	  POSTGRES SQL YACC rules/actions
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 *
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 * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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 * Portions Copyright (c) 1994, Regents of the University of California
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 *
 *
 * IDENTIFICATION
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 *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.439 2003/11/24 16:54:07 tgl Exp $
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 *
 * HISTORY
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 *	  AUTHOR			DATE			MAJOR EVENT
 *	  Andrew Yu			Sept, 1994		POSTQUEL to SQL conversion
 *	  Andrew Yu			Oct, 1994		lispy code conversion
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 *
 * NOTES
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 *	  CAPITALS are used to represent terminal symbols.
 *	  non-capitals are used to represent non-terminals.
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 *	  SQL92-specific syntax is separated from plain SQL/Postgres syntax
 *	  to help isolate the non-extensible portions of the parser.
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 *
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 *	  In general, nothing in this file should initiate database accesses
 *	  nor depend on changeable state (such as SET variables).  If you do
 *	  database accesses, your code will fail when we have aborted the
 *	  current transaction and are just parsing commands to find the next
 *	  ROLLBACK or COMMIT.  If you make use of SET variables, then you
 *	  will do the wrong thing in multi-query strings like this:
 *			SET SQL_inheritance TO off; SELECT * FROM foo;
 *	  because the entire string is parsed by gram.y before the SET gets
 *	  executed.  Anything that depends on the database or changeable state
 *	  should be handled inside parse_analyze() so that it happens at the
 *	  right time not the wrong time.  The handling of SQL_inheritance is
 *	  a good example.
 *
 * WARNINGS
 *	  If you use a list, make sure the datum is a node so that the printing
 *	  routines work.
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 *	  Sometimes we assign constants to makeStrings. Make sure we don't free
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 *	  those.
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 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"
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#include <ctype.h>
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#include <limits.h>
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#include "access/htup.h"
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#include "catalog/index.h"
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#include "catalog/namespace.h"
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#include "catalog/pg_type.h"
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#include "nodes/makefuncs.h"
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#include "nodes/params.h"
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#include "nodes/parsenodes.h"
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#include "parser/gramparse.h"
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#include "storage/lmgr.h"
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#include "utils/numeric.h"
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#include "utils/datetime.h"
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#include "utils/date.h"
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extern List *parsetree;			/* final parse result is delivered here */

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static bool QueryIsRule = FALSE;

/*
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 * If you need access to certain yacc-generated variables and find that
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 * they're static by default, uncomment the next line.  (this is not a
 * problem, yet.)
 */
/*#define __YYSCLASS*/

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static Node *makeTypeCast(Node *arg, TypeName *typename);
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static Node *makeStringConst(char *str, TypeName *typename);
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static Node *makeIntConst(int val);
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static Node *makeFloatConst(char *str);
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static Node *makeAConst(Value *v);
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static Node *makeRowExpr(List *opr, List *largs, List *rargs);
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static Node *makeDistinctExpr(List *largs, List *rargs);
static Node *makeRowNullTest(NullTestType test, List *args);
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static DefElem *makeDefElem(char *name, Node *arg);
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static A_Const *makeBoolConst(bool state);
static FuncCall *makeOverlaps(List *largs, List *rargs);
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static SelectStmt *findLeftmostSelect(SelectStmt *node);
static void insertSelectOptions(SelectStmt *stmt,
								List *sortClause, List *forUpdate,
								Node *limitOffset, Node *limitCount);
static Node *makeSetOp(SetOperation op, bool all, Node *larg, Node *rarg);
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static Node *doNegate(Node *n);
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static void doNegateFloat(Value *v);
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%}

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%union
{
	int					ival;
	char				chr;
	char				*str;
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	const char			*keyword;
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	bool				boolean;
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	JoinType			jtype;
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	DropBehavior		dbehavior;
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	OnCommitAction		oncommit;
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	List				*list;
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	FastList			fastlist;
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	Node				*node;
	Value				*value;
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	ColumnRef			*columnref;
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	ObjectType			objtype;
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	TypeName			*typnam;
	DefElem				*defelt;
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	SortBy				*sortby;
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	JoinExpr			*jexpr;
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	IndexElem			*ielem;
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	Alias				*alias;
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	RangeVar			*range;
	A_Indices			*aind;
	ResTarget			*target;
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	PrivTarget			*privtarget;
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	InsertStmt			*istmt;
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	VariableSetStmt		*vsetstmt;
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}

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%type <node>	stmt schema_stmt
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		AlterDatabaseSetStmt AlterDomainStmt AlterGroupStmt
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		AlterSeqStmt AlterTableStmt AlterUserStmt AlterUserSetStmt
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		AnalyzeStmt ClosePortalStmt ClusterStmt CommentStmt
		ConstraintsSetStmt CopyStmt CreateAsStmt CreateCastStmt
		CreateDomainStmt CreateGroupStmt CreateOpClassStmt CreatePLangStmt
		CreateSchemaStmt CreateSeqStmt CreateStmt
		CreateAssertStmt CreateTrigStmt CreateUserStmt
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		CreatedbStmt DeclareCursorStmt DefineStmt DeleteStmt
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		DropGroupStmt DropOpClassStmt DropPLangStmt DropStmt
		DropAssertStmt DropTrigStmt DropRuleStmt DropCastStmt
		DropUserStmt DropdbStmt ExplainStmt FetchStmt
		GrantStmt IndexStmt InsertStmt ListenStmt LoadStmt
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		LockStmt NotifyStmt ExplainableStmt PreparableStmt
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		CreateFunctionStmt ReindexStmt RemoveAggrStmt
		RemoveFuncStmt RemoveOperStmt RenameStmt RevokeStmt
		RuleActionStmt RuleActionStmtOrEmpty RuleStmt
		SelectStmt TransactionStmt TruncateStmt
		UnlistenStmt UpdateStmt VacuumStmt
		VariableResetStmt VariableSetStmt VariableShowStmt
		ViewStmt CheckPointStmt CreateConversionStmt
		DeallocateStmt PrepareStmt ExecuteStmt

%type <node>	select_no_parens select_with_parens select_clause
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				simple_select
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%type <node>	alter_column_default opclass_item
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%type <ival>	add_drop

%type <dbehavior>	opt_drop_behavior
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%type <list>	createdb_opt_list copy_opt_list
%type <defelt>	createdb_opt_item copy_opt_item
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%type <ival>	opt_lock lock_type cast_context
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%type <boolean>	opt_force opt_or_replace transaction_access_mode
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				opt_grant_grant_option opt_revoke_grant_option
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%type <boolean>	like_including_defaults

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%type <list>	user_list

%type <list>	OptGroupList
%type <defelt>	OptGroupElem
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%type <list>	OptUserList
%type <defelt>	OptUserElem
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%type <str>		OptSchemaName
%type <list>	OptSchemaEltList

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%type <boolean> TriggerActionTime TriggerForSpec opt_trusted
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%type <str>		opt_lancompiler
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%type <str>		TriggerEvents
%type <value>	TriggerFuncArg
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%type <str>		relation_name copy_file_name
				database_name access_method_clause access_method attr_name
				index_name name function_name file_name
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%type <list>	func_name handler_name qual_Op qual_all_Op
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				opt_class opt_validator
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%type <range>	qualified_name OptConstrFromTable
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%type <str>		all_Op MathOp opt_name SpecialRuleRelation
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%type <str>		iso_level opt_encoding
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%type <node>	grantee
%type <list>	grantee_list
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%type <ival>	privilege
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%type <list>	privileges privilege_list
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%type <privtarget> privilege_target
%type <node>	function_with_argtypes
%type <list>	function_with_argtypes_list
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%type <chr> 	TriggerOneEvent
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%type <list>	stmtblock stmtmulti
				OptTableElementList TableElementList OptInherit definition
				opt_distinct opt_definition func_args
				func_args_list func_as createfunc_opt_list
				oper_argtypes RuleActionList RuleActionMulti
				opt_column_list columnList opt_name_list
				sort_clause opt_sort_clause sortby_list index_params
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				name_list from_clause from_list opt_array_bounds
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				qualified_name_list any_name any_name_list
				any_operator expr_list dotted_name attrs
				target_list update_target_list insert_column_list
				insert_target_list def_list opt_indirection
				group_clause TriggerFuncArgs select_limit
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				opt_select_limit opclass_item_list transaction_mode_list
				transaction_mode_list_or_empty
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				TableFuncElementList
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				prep_type_clause prep_type_list
				execute_param_clause
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%type <range>	into_clause OptTempTableName
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%type <defelt>	createfunc_opt_item
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%type <typnam>	func_arg func_return func_type aggr_argtype
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%type <boolean> opt_arg TriggerForType OptTemp OptWithOids
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%type <oncommit>	OnCommitOption
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%type <list>	for_update_clause opt_for_update_clause update_list
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%type <boolean>	opt_all
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%type <node>	join_outer join_qual
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%type <jtype>	join_type
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%type <list>	extract_list overlay_list position_list
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%type <list>	substr_list trim_list
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%type <ival>	opt_interval
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%type <node>	overlay_placing substr_from substr_for
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%type <boolean> opt_instead opt_analyze
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%type <boolean> index_opt_unique opt_verbose opt_full
%type <boolean> opt_freeze opt_default opt_recheck
%type <defelt>	opt_binary opt_oids copy_delimiter
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%type <boolean> copy_from opt_hold
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%type <ival>	fetch_count	opt_column event cursor_options
%type <objtype>	reindex_type drop_type comment_type
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%type <node>	fetch_direction select_limit_value select_offset_value
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%type <list>	OptSeqList
%type <defelt>	OptSeqElem

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%type <istmt>	insert_rest
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%type <vsetstmt> set_rest
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%type <node>	TableElement ConstraintElem TableFuncElement
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%type <node>	columnDef
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%type <defelt>	def_elem
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%type <node>	def_arg columnElem where_clause insert_column_item
				a_expr b_expr c_expr r_expr AexprConst
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				in_expr having_clause func_table array_expr
%type <list>	row row_descriptor type_list array_expr_list
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%type <node>	case_expr case_arg when_clause case_default
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%type <list>	when_clause_list
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%type <ival>	sub_type
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%type <list>	OptCreateAs CreateAsList
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%type <node>	CreateAsElement
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%type <value>	NumericOnly FloatOnly IntegerOnly
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%type <columnref>	columnref
%type <alias>	alias_clause
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%type <sortby>	sortby
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%type <ielem>	index_elem
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%type <node>	table_ref
%type <jexpr>	joined_table
%type <range>	relation_expr
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%type <target>	target_el insert_target_el update_target_el

%type <typnam>	Typename SimpleTypename ConstTypename
				GenericType Numeric opt_float
				Character ConstCharacter
				CharacterWithLength CharacterWithoutLength
				ConstDatetime ConstInterval
				Bit ConstBit BitWithLength BitWithoutLength
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%type <str>		character
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%type <str>		extract_arg
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%type <str>		opt_charset
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%type <ival>	opt_numeric opt_decimal
%type <boolean> opt_varying opt_timezone
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%type <ival>	Iconst
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%type <str>		Sconst comment_text
%type <str>		UserId opt_boolean ColId_or_Sconst
%type <list>	var_list var_list_or_default
%type <str>		ColId ColLabel type_name
%type <node>	var_value zone_value
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%type <keyword> unreserved_keyword func_name_keyword
%type <keyword> col_name_keyword reserved_keyword
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%type <node>	TableConstraint TableLikeClause
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%type <list>	ColQualList
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%type <node>	ColConstraint ColConstraintElem ConstraintAttr
%type <ival>	key_actions key_delete key_match key_update key_action
%type <ival>	ConstraintAttributeSpec ConstraintDeferrabilitySpec
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				ConstraintTimeSpec
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%type <list>	constraints_set_list
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%type <boolean> constraints_set_mode
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/*
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 * If you make any token changes, update the keyword table in
 * parser/keywords.c and add new keywords to the appropriate one of
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 * the reserved-or-not-so-reserved keyword lists, below.
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 */

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/* ordinary key words in alphabetical order */
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%token <keyword> ABORT_P ABSOLUTE_P ACCESS ACTION ADD AFTER
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	AGGREGATE ALL ALTER ANALYSE ANALYZE AND ANY ARRAY AS ASC
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	ASSERTION ASSIGNMENT AT AUTHORIZATION
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	BACKWARD BEFORE BEGIN_P BETWEEN BIGINT BINARY BIT
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	BOOLEAN_P BOTH BY
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	CACHE CALLED CASCADE CASE CAST CHAIN CHAR_P
	CHARACTER CHARACTERISTICS CHECK CHECKPOINT CLASS CLOSE
	CLUSTER COALESCE COLLATE COLUMN COMMENT COMMIT
	COMMITTED CONSTRAINT CONSTRAINTS CONVERSION_P CONVERT COPY CREATE CREATEDB
	CREATEUSER CROSS CURRENT_DATE CURRENT_TIME
	CURRENT_TIMESTAMP CURRENT_USER CURSOR CYCLE
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	DATABASE DAY_P DEALLOCATE DEC DECIMAL_P DECLARE DEFAULT DEFAULTS
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	DEFERRABLE DEFERRED DEFINER DELETE_P DELIMITER DELIMITERS
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	DESC DISTINCT DO DOMAIN_P DOUBLE_P DROP
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	EACH ELSE ENCODING ENCRYPTED END_P ESCAPE EXCEPT EXCLUDING
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	EXCLUSIVE EXECUTE EXISTS EXPLAIN EXTERNAL EXTRACT
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	FALSE_P FETCH FIRST_P FLOAT_P FOR FORCE FOREIGN FORWARD
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	FREEZE FROM FULL FUNCTION
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	GLOBAL GRANT GROUP_P
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	HANDLER HAVING HOLD HOUR_P
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	ILIKE IMMEDIATE IMMUTABLE IMPLICIT_P IN_P INCLUDING INCREMENT
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	INDEX INHERITS INITIALLY INNER_P INOUT INPUT_P
	INSENSITIVE INSERT INSTEAD INT_P INTEGER INTERSECT
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	INTERVAL INTO INVOKER IS ISNULL ISOLATION
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	JOIN
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	KEY
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	LANCOMPILER LANGUAGE LARGE_P LAST_P LEADING LEFT LEVEL LIKE LIMIT
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	LISTEN LOAD LOCAL LOCALTIME LOCALTIMESTAMP LOCATION
	LOCK_P
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	MATCH MAXVALUE MINUTE_P MINVALUE MODE MONTH_P MOVE
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	NAMES NATIONAL NATURAL NCHAR NEW NEXT NO NOCREATEDB
	NOCREATEUSER NONE NOT NOTHING NOTIFY NOTNULL NULL_P
	NULLIF NUMERIC
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	OBJECT_P OF OFF OFFSET OIDS OLD ON ONLY OPERATOR OPTION OR
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	ORDER OUT_P OUTER_P OVERLAPS OVERLAY OWNER
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	PARTIAL PASSWORD PATH_P PENDANT PLACING POSITION
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	PRECISION PRESERVE PREPARE PRIMARY 
	PRIOR PRIVILEGES PROCEDURAL PROCEDURE
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	READ REAL RECHECK REFERENCES REINDEX RELATIVE_P RENAME REPEATABLE REPLACE
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	RESET RESTART RESTRICT RETURNS REVOKE RIGHT ROLLBACK ROW ROWS
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	RULE
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	SCHEMA SCROLL SECOND_P SECURITY SELECT SEQUENCE
	SERIALIZABLE SESSION SESSION_USER SET SETOF SHARE
	SHOW SIMILAR SIMPLE SMALLINT SOME STABLE START STATEMENT
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	STATISTICS STDIN STDOUT STORAGE STRICT_P SUBSTRING SYSID
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	TABLE TEMP TEMPLATE TEMPORARY THEN TIME TIMESTAMP
	TO TOAST TRAILING TRANSACTION TREAT TRIGGER TRIM TRUE_P
	TRUNCATE TRUSTED TYPE_P
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	UNCOMMITTED UNENCRYPTED UNION UNIQUE UNKNOWN UNLISTEN UNTIL
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	UPDATE USAGE USER USING
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	VACUUM VALID VALIDATOR VALUES VARCHAR VARYING
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	VERBOSE VERSION VIEW VOLATILE
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	WHEN WHERE WITH WITHOUT WORK WRITE
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	YEAR_P
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	ZONE
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/* The grammar thinks these are keywords, but they are not in the keywords.c
 * list and so can never be entered directly.  The filter in parser.c
 * creates these tokens when required.
 */
%token			UNIONJOIN

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/* Special keywords, not in the query language - see the "lex" file */
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%token <str>	IDENT FCONST SCONST BCONST XCONST Op
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%token <ival>	ICONST PARAM
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/* precedence: lowest to highest */
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%left		UNION EXCEPT
%left		INTERSECT
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%left		OR
%left		AND
%right		NOT
%right		'='
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%nonassoc	'<' '>'
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%nonassoc	LIKE ILIKE SIMILAR
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%nonassoc	ESCAPE
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%nonassoc	OVERLAPS
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%nonassoc	BETWEEN
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%nonassoc	IN_P
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%left		POSTFIXOP		/* dummy for postfix Op rules */
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%left		Op OPERATOR		/* multi-character ops and user-defined operators */
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%nonassoc	NOTNULL
%nonassoc	ISNULL
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%nonassoc	IS NULL_P TRUE_P FALSE_P UNKNOWN /* sets precedence for IS NULL, etc */
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%left		'+' '-'
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%left		'*' '/' '%'
%left		'^'
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/* Unary Operators */
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%left		AT ZONE			/* sets precedence for AT TIME ZONE */
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%right		UMINUS
%left		'[' ']'
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%left		'(' ')'
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%left		TYPECAST
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%left		'.'
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/*
 * These might seem to be low-precedence, but actually they are not part
 * of the arithmetic hierarchy at all in their use as JOIN operators.
 * We make them high-precedence to support their use as function names.
 * They wouldn't be given a precedence at all, were it not that we need
 * left-associativity among the JOIN rules themselves.
 */
%left		JOIN UNIONJOIN CROSS LEFT FULL RIGHT INNER_P NATURAL
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%%

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/*
 *	Handle comment-only lines, and ;; SELECT * FROM pg_class ;;;
 *	psql already handles such cases, but other interfaces don't.
 *	bjm 1999/10/05
 */
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stmtblock:	stmtmulti								{ parsetree = $1; }
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		;
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/* the thrashing around here is to discard "empty" statements... */
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stmtmulti:	stmtmulti ';' stmt
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				{ if ($3 != (Node *)NULL)
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					$$ = lappend($1, $3);
				  else
					$$ = $1;
				}
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			| stmt
					{ if ($1 != (Node *)NULL)
						$$ = makeList1($1);
					  else
						$$ = NIL;
					}
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		;
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stmt :
			AlterDatabaseSetStmt
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			| AlterDomainStmt
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			| AlterGroupStmt
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			| AlterSeqStmt
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			| AlterTableStmt
			| AlterUserSetStmt
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			| AlterUserStmt
			| AnalyzeStmt
			| CheckPointStmt
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			| ClosePortalStmt
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			| ClusterStmt
			| CommentStmt
			| ConstraintsSetStmt
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			| CopyStmt
			| CreateAsStmt
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			| CreateAssertStmt
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			| CreateCastStmt
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			| CreateConversionStmt
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			| CreateDomainStmt
			| CreateFunctionStmt
			| CreateGroupStmt
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			| CreateOpClassStmt
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			| CreatePLangStmt
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			| CreateSchemaStmt
			| CreateSeqStmt
			| CreateStmt
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			| CreateTrigStmt
			| CreateUserStmt
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			| CreatedbStmt
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			| DeallocateStmt
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			| DeclareCursorStmt
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			| DefineStmt
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			| DeleteStmt
			| DropAssertStmt
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			| DropCastStmt
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			| DropGroupStmt
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			| DropOpClassStmt
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			| DropPLangStmt
			| DropRuleStmt
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			| DropStmt
			| DropTrigStmt
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			| DropUserStmt
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			| DropdbStmt
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			| ExecuteStmt
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			| ExplainStmt
			| FetchStmt
			| GrantStmt
			| IndexStmt
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			| InsertStmt
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			| ListenStmt
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			| LoadStmt
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			| LockStmt
			| NotifyStmt
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			| PrepareStmt
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			| ReindexStmt
			| RemoveAggrStmt
			| RemoveFuncStmt
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			| RemoveOperStmt
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			| RenameStmt
			| RevokeStmt
			| RuleStmt
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			| SelectStmt
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			| TransactionStmt
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			| TruncateStmt
			| UnlistenStmt
			| UpdateStmt
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			| VacuumStmt
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			| VariableResetStmt
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			| VariableSetStmt
			| VariableShowStmt
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			| ViewStmt
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			| /*EMPTY*/
				{ $$ = (Node *)NULL; }
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		;
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/*****************************************************************************
 *
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 * Create a new Postgres DBMS user
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 *
 *
 *****************************************************************************/

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CreateUserStmt:
			CREATE USER UserId opt_with OptUserList
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				{
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					CreateUserStmt *n = makeNode(CreateUserStmt);
					n->user = $3;
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					n->options = $5;
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					$$ = (Node *)n;
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				}
		;


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opt_with:	WITH									{}
			| /*EMPTY*/								{}
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		;
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/*****************************************************************************
 *
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 * Alter a postgresql DBMS user
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 *
 *
 *****************************************************************************/

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AlterUserStmt:
			ALTER USER UserId opt_with OptUserList
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				 {
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					AlterUserStmt *n = makeNode(AlterUserStmt);
					n->user = $3;
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					n->options = $5;
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					$$ = (Node *)n;
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				 }
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		;
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AlterUserSetStmt:
			ALTER USER UserId SET set_rest
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				{
					AlterUserSetStmt *n = makeNode(AlterUserSetStmt);
					n->user = $3;
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					n->variable = $5->name;
					n->value = $5->args;
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					$$ = (Node *)n;
				}
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			| ALTER USER UserId VariableResetStmt
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				{
					AlterUserSetStmt *n = makeNode(AlterUserSetStmt);
					n->user = $3;
					n->variable = ((VariableResetStmt *)$4)->name;
609
					n->value = NIL;
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					$$ = (Node *)n;
				}
612
			;
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/*****************************************************************************
 *
617
 * Drop a postgresql DBMS user
618
 *
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 * XXX Ideally this would have CASCADE/RESTRICT options, but since a user
 * might own objects in multiple databases, there is presently no way to
 * implement either cascading or restricting.  Caveat DBA.
622 623
 *****************************************************************************/

624 625
DropUserStmt:
			DROP USER user_list
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				{
					DropUserStmt *n = makeNode(DropUserStmt);
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					n->users = $3;
629 630
					$$ = (Node *)n;
				}
631
			;
632

633 634 635
/*
 * Options for CREATE USER and ALTER USER
 */
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OptUserList:
			OptUserList OptUserElem					{ $$ = lappend($1, $2); }
			| /* EMPTY */							{ $$ = NIL; }
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		;

641 642
OptUserElem:
			PASSWORD Sconst
643
				{
644
					$$ = makeDefElem("password", (Node *)makeString($2));
645
				}
646
			| ENCRYPTED PASSWORD Sconst
647
				{
648
					$$ = makeDefElem("encryptedPassword", (Node *)makeString($3));
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				}
			| UNENCRYPTED PASSWORD Sconst
651
				{
652
					$$ = makeDefElem("unencryptedPassword", (Node *)makeString($3));
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				}
			| SYSID Iconst
				{
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					$$ = makeDefElem("sysid", (Node *)makeInteger($2));
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				}
			| CREATEDB
659
				{
660
					$$ = makeDefElem("createdb", (Node *)makeInteger(TRUE));
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				}
			| NOCREATEDB
663
				{
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					$$ = makeDefElem("createdb", (Node *)makeInteger(FALSE));
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				}
			| CREATEUSER
667
				{
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					$$ = makeDefElem("createuser", (Node *)makeInteger(TRUE));
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				}
			| NOCREATEUSER
671
				{
672
					$$ = makeDefElem("createuser", (Node *)makeInteger(FALSE));
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				}
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			| IN_P GROUP_P user_list
675
				{
676
					$$ = makeDefElem("groupElts", (Node *)$3);
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				}
			| VALID UNTIL Sconst
679
				{
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					$$ = makeDefElem("validUntil", (Node *)makeString($3));
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				}
		;
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user_list:	user_list ',' UserId		{ $$ = lappend($1, makeString($3)); }
			| UserId					{ $$ = makeList1(makeString($1)); }
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		;

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/*****************************************************************************
 *
692
 * Create a postgresql group
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 *
 *
 *****************************************************************************/

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CreateGroupStmt:
			CREATE GROUP_P UserId opt_with OptGroupList
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				{
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					CreateGroupStmt *n = makeNode(CreateGroupStmt);
					n->name = $3;
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					n->options = $5;
703
					$$ = (Node *)n;
704
				}
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		;

/*
 * Options for CREATE GROUP
 */
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OptGroupList:
			OptGroupList OptGroupElem				{ $$ = lappend($1, $2); }
			| /* EMPTY */							{ $$ = NIL; }
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		;

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OptGroupElem:
			USER user_list
717
				{
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					$$ = makeDefElem("userElts", (Node *)$2);
719
				}
720
			| SYSID Iconst
721
				{
722
					$$ = makeDefElem("sysid", (Node *)makeInteger($2));
723
				}
724
		;
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726 727 728

/*****************************************************************************
 *
729
 * Alter a postgresql group
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 *
 *
 *****************************************************************************/

734 735
AlterGroupStmt:
			ALTER GROUP_P UserId add_drop USER user_list
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				{
					AlterGroupStmt *n = makeNode(AlterGroupStmt);
					n->name = $3;
739
					n->action = $4;
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					n->listUsers = $6;
					$$ = (Node *)n;
				}
743
		;
744

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add_drop:	ADD										{ $$ = +1; }
			| DROP									{ $$ = -1; }
747 748
		;

749

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/*****************************************************************************
 *
752
 * Drop a postgresql group
753
 *
754
 * XXX see above notes about cascading DROP USER; groups have same problem.
755 756
 *****************************************************************************/

757 758
DropGroupStmt:
			DROP GROUP_P UserId
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				{
					DropGroupStmt *n = makeNode(DropGroupStmt);
					n->name = $3;
					$$ = (Node *)n;
				}
764
		;
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/*****************************************************************************
 *
 * Manipulate a schema
 *
 *****************************************************************************/

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CreateSchemaStmt:
			CREATE SCHEMA OptSchemaName AUTHORIZATION UserId OptSchemaEltList
775
				{
776
					CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
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					/* One can omit the schema name or the authorization id. */
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					if ($3 != NULL)
						n->schemaname = $3;
					else
						n->schemaname = $5;
					n->authid = $5;
					n->schemaElts = $6;
					$$ = (Node *)n;
				}
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			| CREATE SCHEMA ColId OptSchemaEltList
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				{
					CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
					/* ...but not both */
					n->schemaname = $3;
					n->authid = NULL;
					n->schemaElts = $4;
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					$$ = (Node *)n;
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				}
		;

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OptSchemaName:
			ColId									{ $$ = $1; }
			| /* EMPTY */							{ $$ = NULL; }
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		;

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OptSchemaEltList:
			OptSchemaEltList schema_stmt			{ $$ = lappend($1, $2); }
			| /* EMPTY */							{ $$ = NIL; }
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		;
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/*
 *	schema_stmt are the ones that can show up inside a CREATE SCHEMA
 *	statement (in addition to by themselves).
 */
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schema_stmt:
			CreateStmt
			| GrantStmt
			| ViewStmt
815
		;
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817

818
/*****************************************************************************
819
 *
820
 * Set PG internal variable
821
 *	  SET name TO 'var_value'
822
 * Include SQL92 syntax (thomas 1997-10-22):
823
 *	  SET TIME ZONE 'var_value'
824
 *
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 *****************************************************************************/

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VariableSetStmt:
			SET set_rest
829
				{
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					VariableSetStmt *n = $2;
					n->is_local = false;
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					$$ = (Node *) n;
				}
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			| SET LOCAL set_rest
835
				{
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					VariableSetStmt *n = $3;
					n->is_local = true;
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					$$ = (Node *) n;
				}
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			| SET SESSION set_rest
841
				{
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					VariableSetStmt *n = $3;
					n->is_local = false;
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					$$ = (Node *) n;
				}
846 847 848
		;

set_rest:  ColId TO var_list_or_default
849 850
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
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					n->name = $1;
					n->args = $3;
					$$ = n;
854
				}
855
			| ColId '=' var_list_or_default
856 857
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
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					n->name = $1;
					n->args = $3;
					$$ = n;
861
				}
862
			| TIME ZONE zone_value
863 864
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
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					n->name = "timezone";
866
					if ($3 != NULL)
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						n->args = makeList1($3);
					$$ = n;
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				}
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			| TRANSACTION transaction_mode_list
871 872
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
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					n->name = "TRANSACTION";
					n->args = $2;
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					$$ = n;
				}
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			| SESSION CHARACTERISTICS AS TRANSACTION transaction_mode_list
878 879
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
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					n->name = "SESSION CHARACTERISTICS";
					n->args = $5;
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					$$ = n;
				}
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			| NAMES opt_encoding
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				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "client_encoding";
					if ($2 != NULL)
						n->args = makeList1(makeStringConst($2, NULL));
					$$ = n;
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				}
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			| SESSION AUTHORIZATION ColId_or_Sconst
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				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "session_authorization";
					n->args = makeList1(makeStringConst($3, NULL));
					$$ = n;
				}
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			| SESSION AUTHORIZATION DEFAULT
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				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "session_authorization";
					n->args = NIL;
904
					$$ = n;
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				}
		;

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var_list_or_default:
			var_list								{ $$ = $1; }
			| DEFAULT								{ $$ = NIL; }
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		;

913
var_list:	var_value								{ $$ = makeList1($1); }
914
			| var_list ',' var_value				{ $$ = lappend($1, $3); }
915 916
		;

917
var_value:	opt_boolean
918
				{ $$ = makeStringConst($1, NULL); }
919
			| ColId_or_Sconst
920
				{ $$ = makeStringConst($1, NULL); }
921
			| NumericOnly
922 923
				{ $$ = makeAConst($1); }
		;
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iso_level:	READ UNCOMMITTED						{ $$ = "read uncommitted"; }
			| READ COMMITTED						{ $$ = "read committed"; }
			| REPEATABLE READ						{ $$ = "repeatable read"; }
928
			| SERIALIZABLE							{ $$ = "serializable"; }
929
		;
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opt_boolean:
			TRUE_P									{ $$ = "true"; }
			| FALSE_P								{ $$ = "false"; }
			| ON									{ $$ = "on"; }
			| OFF									{ $$ = "off"; }
936 937
		;

938 939
/* Timezone values can be:
 * - a string such as 'pst8pdt'
940
 * - an identifier such as "pst8pdt"
941 942
 * - an integer or floating point number
 * - a time interval per SQL99
943
 * ColId gives reduce/reduce errors against ConstInterval and LOCAL,
944
 * so use IDENT and reject anything which is a reserved word.
945
 */
946 947
zone_value:
			Sconst
948
				{
949
					$$ = makeStringConst($1, NULL);
950
				}
951 952 953
			| IDENT
				{
					$$ = makeStringConst($1, NULL);
954
				}
955
			| ConstInterval Sconst opt_interval
956
				{
957
					A_Const *n = (A_Const *) makeStringConst($2, $1);
958
					if ($3 != INTERVAL_FULL_RANGE)
959
					{
960
						if (($3 & ~(INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE))) != 0)
961 962 963
							ereport(ERROR,
									(errcode(ERRCODE_SYNTAX_ERROR),
									 errmsg("time zone interval must be HOUR or HOUR TO MINUTE")));
964
						n->typename->typmod = INTERVAL_TYPMOD(INTERVAL_FULL_PRECISION, $3);
965 966
					}
					$$ = (Node *)n;
967
				}
968 969 970
			| ConstInterval '(' Iconst ')' Sconst opt_interval
				{
					A_Const *n = (A_Const *) makeStringConst($5, $1);
971
					if ($3 < 0)
972 973 974 975
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision must not be negative",
										$3)));
976 977
					if ($3 > MAX_INTERVAL_PRECISION)
					{
978
						ereport(WARNING,
979 980 981
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision reduced to maximum allowed, %d",
										$3, MAX_INTERVAL_PRECISION)));
982 983
						$3 = MAX_INTERVAL_PRECISION;
					}
984 985 986

					if (($6 != INTERVAL_FULL_RANGE)
						&& (($6 & ~(INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE))) != 0))
987 988 989
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("time zone interval must be HOUR or HOUR TO MINUTE")));
990 991

					n->typename->typmod = INTERVAL_TYPMOD($3, $6);
992

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					$$ = (Node *)n;
				}
			| NumericOnly							{ $$ = makeAConst($1); }
			| DEFAULT								{ $$ = NULL; }
			| LOCAL									{ $$ = NULL; }
998
		;
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opt_encoding:
			Sconst									{ $$ = $1; }
			| DEFAULT								{ $$ = NULL; }
			| /*EMPTY*/								{ $$ = NULL; }
		;
1005

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ColId_or_Sconst:
			ColId									{ $$ = $1; }
			| SCONST								{ $$ = $1; }
1009
		;
1010 1011


1012 1013
VariableShowStmt:
			SHOW ColId
1014 1015
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
1016
					n->name = $2;
1017 1018
					$$ = (Node *) n;
				}
1019
			| SHOW TIME ZONE
1020 1021
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
1022
					n->name = "timezone";
1023 1024
					$$ = (Node *) n;
				}
1025
			| SHOW TRANSACTION ISOLATION LEVEL
1026 1027
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
1028
					n->name = "transaction_isolation";
1029 1030
					$$ = (Node *) n;
				}
1031
			| SHOW SESSION AUTHORIZATION
1032 1033 1034 1035 1036
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name = "session_authorization";
					$$ = (Node *) n;
				}
1037
			| SHOW ALL
1038 1039
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
1040
					n->name = "all";
1041 1042
					$$ = (Node *) n;
				}
1043 1044
		;

1045 1046
VariableResetStmt:
			RESET ColId
1047 1048
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
1049
					n->name = $2;
1050 1051
					$$ = (Node *) n;
				}
1052
			| RESET TIME ZONE
1053 1054
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
1055
					n->name = "timezone";
1056 1057
					$$ = (Node *) n;
				}
1058
			| RESET TRANSACTION ISOLATION LEVEL
1059 1060
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
1061
					n->name = "transaction_isolation";
1062 1063
					$$ = (Node *) n;
				}
1064
			| RESET SESSION AUTHORIZATION
1065 1066 1067 1068 1069
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name = "session_authorization";
					$$ = (Node *) n;
				}
1070
			| RESET ALL
1071 1072
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
1073
					n->name = "all";
1074 1075
					$$ = (Node *) n;
				}
1076
		;
1077

1078

1079 1080
ConstraintsSetStmt:
			SET CONSTRAINTS constraints_set_list constraints_set_mode
1081 1082 1083 1084 1085 1086 1087 1088
				{
					ConstraintsSetStmt *n = makeNode(ConstraintsSetStmt);
					n->constraints = $3;
					n->deferred    = $4;
					$$ = (Node *) n;
				}
		;

1089 1090 1091
constraints_set_list:
			ALL										{ $$ = NIL; }
			| name_list								{ $$ = $1; }
1092 1093
		;

1094 1095 1096
constraints_set_mode:
			DEFERRED								{ $$ = TRUE; }
			| IMMEDIATE								{ $$ = FALSE; }
1097 1098 1099
		;


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/*
 * Checkpoint statement
 */
1103 1104
CheckPointStmt:
			CHECKPOINT
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				{
					CheckPointStmt *n = makeNode(CheckPointStmt);
					$$ = (Node *)n;
				}
1109 1110
		;

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1112 1113
/*****************************************************************************
 *
1114
 *	ALTER TABLE variations
1115 1116 1117
 *
 *****************************************************************************/

1118
AlterTableStmt:
1119 1120
			/* ALTER TABLE <relation> ADD [COLUMN] <coldef> */
			ALTER TABLE relation_expr ADD opt_column columnDef
1121 1122 1123
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'A';
1124
					n->relation = $3;
1125
					n->def = $6;
1126 1127
					$$ = (Node *)n;
				}
1128 1129
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> {SET DEFAULT <expr>|DROP DEFAULT} */
			| ALTER TABLE relation_expr ALTER opt_column ColId alter_column_default
1130 1131 1132
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'T';
1133
					n->relation = $3;
1134 1135
					n->name = $6;
					n->def = $7;
1136 1137
					$$ = (Node *)n;
				}
1138 1139
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> DROP NOT NULL */
			| ALTER TABLE relation_expr ALTER opt_column ColId DROP NOT NULL_P
1140 1141 1142 1143 1144 1145 1146
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'N';
					n->relation = $3;
					n->name = $6;
					$$ = (Node *)n;
				}
1147 1148
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> SET NOT NULL */
			| ALTER TABLE relation_expr ALTER opt_column ColId SET NOT NULL_P
1149 1150
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
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					n->subtype = 'n';
1152 1153 1154 1155
					n->relation = $3;
					n->name = $6;
					$$ = (Node *)n;
				}
1156 1157
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> SET STATISTICS <IntegerOnly> */
			| ALTER TABLE relation_expr ALTER opt_column ColId SET STATISTICS IntegerOnly
1158 1159 1160
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'S';
1161
					n->relation = $3;
1162
					n->name = $6;
1163
					n->def = (Node *) $9;
1164 1165
					$$ = (Node *)n;
				}
1166
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> SET STORAGE <storagemode> */
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			| ALTER TABLE relation_expr ALTER opt_column ColId
			SET STORAGE ColId
1169
				{
1170 1171
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'M';
1172
					n->relation = $3;
1173 1174 1175 1176
					n->name = $6;
					n->def = (Node *) makeString($9);
					$$ = (Node *)n;
				}
1177 1178
			/* ALTER TABLE <relation> DROP [COLUMN] <colname> [RESTRICT|CASCADE] */
			| ALTER TABLE relation_expr DROP opt_column ColId opt_drop_behavior
1179 1180 1181
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'D';
1182
					n->relation = $3;
1183 1184
					n->name = $6;
					n->behavior = $7;
1185 1186
					$$ = (Node *)n;
				}
1187 1188
			/* ALTER TABLE <relation> ADD CONSTRAINT ... */
			| ALTER TABLE relation_expr ADD TableConstraint
1189 1190 1191
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'C';
1192
					n->relation = $3;
1193
					n->def = $5;
1194 1195
					$$ = (Node *)n;
				}
1196 1197
			/* ALTER TABLE <relation> DROP CONSTRAINT <name> [RESTRICT|CASCADE] */
			| ALTER TABLE relation_expr DROP CONSTRAINT name opt_drop_behavior
1198 1199 1200
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'X';
1201
					n->relation = $3;
1202 1203
					n->name = $6;
					n->behavior = $7;
1204 1205
					$$ = (Node *)n;
				}
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			/* ALTER TABLE <relation> SET WITHOUT OIDS  */
			| ALTER TABLE relation_expr SET WITHOUT OIDS
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->relation = $3;
					n->subtype = 'o';
					$$ = (Node *)n;
				}
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			/* ALTER TABLE <name> CREATE TOAST TABLE */
			| ALTER TABLE qualified_name CREATE TOAST TABLE
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TOAST  
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				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'E';
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					$3->inhOpt = INH_NO;
					n->relation = $3;
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					$$ = (Node *)n;
				}
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			/* ALTER TABLE <name> OWNER TO UserId */
			| ALTER TABLE qualified_name OWNER TO UserId
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				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'U';
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					$3->inhOpt = INH_NO;
					n->relation = $3;
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					n->name = $6;
					$$ = (Node *)n;
				}
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			/* ALTER TABLE <name> CLUSTER ON <indexname> */
			| ALTER TABLE qualified_name CLUSTER ON name
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->subtype = 'L';
					n->relation = $3;
					n->name = $6;
					$$ = (Node *)n;
				}
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		;
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alter_column_default:
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			SET DEFAULT a_expr
				{
					/* Treat SET DEFAULT NULL the same as DROP DEFAULT */
					if (exprIsNullConstant($3))
						$$ = NULL;
					else
						$$ = $3;
				}
			| DROP DEFAULT					{ $$ = NULL; }
		;
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opt_drop_behavior:
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			CASCADE						{ $$ = DROP_CASCADE; }
			| RESTRICT					{ $$ = DROP_RESTRICT; }
			| /* EMPTY */				{ $$ = DROP_RESTRICT; /* default */ }
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		;

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1263
/*****************************************************************************
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 *
1265
 *		QUERY :
1266
 *				close <portalname>
1267
 *
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 *****************************************************************************/

1270
ClosePortalStmt:
1271
			CLOSE name
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				{
					ClosePortalStmt *n = makeNode(ClosePortalStmt);
					n->portalname = $2;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY :
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 *				COPY <relname> ['(' columnList ')'] FROM/TO [WITH options]
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 *
 *				BINARY, OIDS, and DELIMITERS kept in old locations
 *				for backward compatibility.  2002-06-18
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 *
 *****************************************************************************/

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CopyStmt:	COPY opt_binary qualified_name opt_column_list opt_oids
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			copy_from copy_file_name copy_delimiter opt_with copy_opt_list
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				{
					CopyStmt *n = makeNode(CopyStmt);
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					n->relation = $3;
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					n->attlist = $4;
					n->is_from = $6;
					n->filename = $7;
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					n->options = NIL;
					/* Concatenate user-supplied flags */
					if ($2)
						n->options = lappend(n->options, $2);
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					if ($5)
						n->options = lappend(n->options, $5);
					if ($8)
						n->options = lappend(n->options, $8);
					if ($10)
						n->options = nconc(n->options, $10);
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					$$ = (Node *)n;
				}
		;

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copy_from:
			FROM									{ $$ = TRUE; }
			| TO									{ $$ = FALSE; }
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		;
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/*
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 * copy_file_name NULL indicates stdio is used. Whether stdin or stdout is
 * used depends on the direction. (It really doesn't make sense to copy from
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 * stdout. We silently correct the "typo".		 - AY 9/94
1322
 */
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copy_file_name:
			Sconst									{ $$ = $1; }
			| STDIN									{ $$ = NULL; }
			| STDOUT								{ $$ = NULL; }
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		;
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copy_opt_list:
			copy_opt_list copy_opt_item				{ $$ = lappend($1, $2); }
			| /* EMPTY */							{ $$ = NIL; }
1334
		;
1335

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copy_opt_item:
			BINARY
				{
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					$$ = makeDefElem("binary", (Node *)makeInteger(TRUE));
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				}
			| OIDS
				{
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					$$ = makeDefElem("oids", (Node *)makeInteger(TRUE));
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				}
			| DELIMITER opt_as Sconst
				{
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					$$ = makeDefElem("delimiter", (Node *)makeString($3));
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				}
			| NULL_P opt_as Sconst
				{
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					$$ = makeDefElem("null", (Node *)makeString($3));
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				}
		;

/* The following exist for backward compatibility */

opt_binary:
			BINARY
				{
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					$$ = makeDefElem("binary", (Node *)makeInteger(TRUE));
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				}
			| /*EMPTY*/								{ $$ = NULL; }
		;

opt_oids:
			WITH OIDS
				{
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					$$ = makeDefElem("oids", (Node *)makeInteger(TRUE));
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				}
			| /*EMPTY*/								{ $$ = NULL; }
1372
		;
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copy_delimiter:
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			/* USING DELIMITERS kept for backward compatibility. 2002-06-15 */
			opt_using DELIMITERS Sconst
				{
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					$$ = makeDefElem("delimiter", (Node *)makeString($3));
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				}
			| /*EMPTY*/								{ $$ = NULL; }
1381
		;
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opt_using:
			USING									{}
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			| /*EMPTY*/								{}
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		;

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/*****************************************************************************
 *
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 *		QUERY :
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 *				CREATE TABLE relname
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 *
 *****************************************************************************/

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CreateStmt:	CREATE OptTemp TABLE qualified_name '(' OptTableElementList ')'
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			OptInherit OptWithOids OnCommitOption
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				{
					CreateStmt *n = makeNode(CreateStmt);
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					$4->istemp = $2;
					n->relation = $4;
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					n->tableElts = $6;
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					n->inhRelations = $8;
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					n->constraints = NIL;
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					n->hasoids = $9;
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					n->oncommit = $10;
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					$$ = (Node *)n;
				}
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		| CREATE OptTemp TABLE qualified_name OF qualified_name
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			'(' OptTableElementList ')' OptWithOids OnCommitOption
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				{
					/* SQL99 CREATE TABLE OF <UDT> (cols) seems to be satisfied
					 * by our inheritance capabilities. Let's try it...
					 */
					CreateStmt *n = makeNode(CreateStmt);
					$4->istemp = $2;
					n->relation = $4;
					n->tableElts = $8;
					n->inhRelations = makeList1($6);
					n->constraints = NIL;
					n->hasoids = $10;
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					n->oncommit = $11;
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					$$ = (Node *)n;
				}
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		;

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/*
 * Redundancy here is needed to avoid shift/reduce conflicts,
 * since TEMP is not a reserved word.  See also OptTempTableName.
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 *
 * NOTE: we accept both GLOBAL and LOCAL options; since we have no modules
 * the LOCAL keyword is really meaningless.
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 */
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OptTemp:	TEMPORARY						{ $$ = TRUE; }
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			| TEMP							{ $$ = TRUE; }
			| LOCAL TEMPORARY				{ $$ = TRUE; }
			| LOCAL TEMP					{ $$ = TRUE; }
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			| GLOBAL TEMPORARY				{ $$ = TRUE; }
			| GLOBAL TEMP					{ $$ = TRUE; }
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			| /*EMPTY*/						{ $$ = FALSE; }
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		;

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OptTableElementList:
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			TableElementList					{ $$ = $1; }
			| /*EMPTY*/							{ $$ = NIL; }
		;

TableElementList:
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			TableElement
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				{
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					$$ = makeList1($1);
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				}
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			| TableElementList ',' TableElement
1454
				{
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					$$ = lappend($1, $3);
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				}
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		;
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TableElement:
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			columnDef							{ $$ = $1; }
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			| TableLikeClause					{ $$ = $1; }
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			| TableConstraint					{ $$ = $1; }
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		;
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columnDef:	ColId Typename ColQualList
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				{
					ColumnDef *n = makeNode(ColumnDef);
					n->colname = $1;
					n->typename = $2;
					n->constraints = $3;
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					n->is_local = true;
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					$$ = (Node *)n;
				}
		;

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ColQualList:
			ColQualList ColConstraint				{ $$ = lappend($1, $2); }
			| /*EMPTY*/								{ $$ = NIL; }
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		;

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ColConstraint:
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			CONSTRAINT name ColConstraintElem
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				{
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					switch (nodeTag($3))
					{
						case T_Constraint:
							{
								Constraint *n = (Constraint *)$3;
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								n->name = $2;
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							}
							break;
						case T_FkConstraint:
							{
								FkConstraint *n = (FkConstraint *)$3;
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								n->constr_name = $2;
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							}
							break;
						default:
							break;
					}
					$$ = $3;
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				}
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			| ColConstraintElem						{ $$ = $1; }
			| ConstraintAttr						{ $$ = $1; }
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		;

/* DEFAULT NULL is already the default for Postgres.
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 * But define it here and carry it forward into the system
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 * to make it explicit.
 * - thomas 1998-09-13
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 *
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 * WITH NULL and NULL are not SQL92-standard syntax elements,
 * so leave them out. Use DEFAULT NULL to explicitly indicate
 * that a column may have that value. WITH NULL leads to
 * shift/reduce conflicts with WITH TIME ZONE anyway.
 * - thomas 1999-01-08
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 *
 * DEFAULT expression must be b_expr not a_expr to prevent shift/reduce
 * conflict on NOT (since NOT might start a subsequent NOT NULL constraint,
 * or be part of a_expr NOT LIKE or similar constructs).
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 */
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ColConstraintElem:
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			NOT NULL_P
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				{
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					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_NOTNULL;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = NULL;
					$$ = (Node *)n;
				}
			| NULL_P
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_NULL;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = NULL;
					$$ = (Node *)n;
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				}
			| UNIQUE
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				{
					Constraint *n = makeNode(Constraint);
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					n->contype = CONSTR_UNIQUE;
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					n->name = NULL;
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					n->raw_expr = NULL;
					n->cooked_expr = NULL;
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					n->keys = NULL;
					$$ = (Node *)n;
				}
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			| PRIMARY KEY
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				{
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					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_PRIMARY;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = NULL;
					$$ = (Node *)n;
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				}
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			| CHECK '(' a_expr ')'
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				{
					Constraint *n = makeNode(Constraint);
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					n->contype = CONSTR_CHECK;
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					n->name = NULL;
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					n->raw_expr = $3;
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					n->cooked_expr = NULL;
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					n->keys = NULL;
					$$ = (Node *)n;
				}
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			| DEFAULT b_expr
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_DEFAULT;
					n->name = NULL;
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					if (exprIsNullConstant($2))
					{
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						/* DEFAULT NULL should be reported as empty expr */
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						n->raw_expr = NULL;
					}
					else
					{
						n->raw_expr = $2;
					}
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					n->cooked_expr = NULL;
					n->keys = NULL;
					$$ = (Node *)n;
				}
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			| REFERENCES qualified_name opt_column_list key_match key_actions
1592
				{
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					FkConstraint *n = makeNode(FkConstraint);
					n->constr_name		= NULL;
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					n->pktable			= $2;
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					n->fk_attrs			= NIL;
					n->pk_attrs			= $3;
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					n->fk_matchtype		= $4;
					n->fk_upd_action	= (char) ($5 >> 8);
					n->fk_del_action	= (char) ($5 & 0xFF);
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					n->deferrable		= FALSE;
					n->initdeferred		= FALSE;
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					$$ = (Node *)n;
1604
				}
1605
		;
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/*
 * ConstraintAttr represents constraint attributes, which we parse as if
 * they were independent constraint clauses, in order to avoid shift/reduce
 * conflicts (since NOT might start either an independent NOT NULL clause
 * or an attribute).  analyze.c is responsible for attaching the attribute
 * information to the preceding "real" constraint node, and for complaining
 * if attribute clauses appear in the wrong place or wrong combinations.
 *
 * See also ConstraintAttributeSpec, which can be used in places where
 * there is no parsing conflict.
 */
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ConstraintAttr:
			DEFERRABLE
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				{
					Constraint *n = makeNode(Constraint);
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					n->contype = CONSTR_ATTR_DEFERRABLE;
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					$$ = (Node *)n;
				}
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			| NOT DEFERRABLE
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				{
					Constraint *n = makeNode(Constraint);
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					n->contype = CONSTR_ATTR_NOT_DEFERRABLE;
					$$ = (Node *)n;
				}
			| INITIALLY DEFERRED
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_ATTR_DEFERRED;
					$$ = (Node *)n;
				}
			| INITIALLY IMMEDIATE
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_ATTR_IMMEDIATE;
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					$$ = (Node *)n;
				}
1643 1644
		;

1645

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/*
 * SQL99 supports wholesale borrowing of a table definition via the LIKE clause.
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 * This seems to be a poor man's inheritance capability, with the resulting
 * tables completely decoupled except for the original commonality in definitions.
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 *
 * This is very similar to CREATE TABLE AS except for the INCLUDING DEFAULTS extension
 * which is a part of SQL 200N
1653
 */
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TableLikeClause:
			LIKE qualified_name like_including_defaults
1656
				{
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					InhRelation *n = makeNode(InhRelation);
					n->relation = $2;
					n->including_defaults = $3;

					$$ = (Node *)n;
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				}
		;

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like_including_defaults:
				INCLUDING DEFAULTS		{ $$ = true; }
				| EXCLUDING DEFAULTS		{ $$ = false; }
				| /* EMPTY */				{ $$ = false; }
		;

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1672
/* ConstraintElem specifies constraint syntax which is not embedded into
1673
 *	a column definition. ColConstraintElem specifies the embedded form.
1674 1675
 * - thomas 1997-12-03
 */
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TableConstraint:
			CONSTRAINT name ConstraintElem
1678
				{
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					switch (nodeTag($3))
					{
						case T_Constraint:
							{
								Constraint *n = (Constraint *)$3;
1684
								n->name = $2;
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							}
							break;
						case T_FkConstraint:
							{
								FkConstraint *n = (FkConstraint *)$3;
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								n->constr_name = $2;
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							}
							break;
						default:
							break;
					}
					$$ = $3;
1697
				}
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			| ConstraintElem						{ $$ = $1; }
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		;

1701 1702
ConstraintElem:
			CHECK '(' a_expr ')'
1703
				{
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					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_CHECK;
					n->name = NULL;
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					n->raw_expr = $3;
					n->cooked_expr = NULL;
1709
					$$ = (Node *)n;
1710
				}
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			| UNIQUE '(' columnList ')'
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				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_UNIQUE;
					n->name = NULL;
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					n->raw_expr = NULL;
					n->cooked_expr = NULL;
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					n->keys = $3;
					$$ = (Node *)n;
				}
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			| PRIMARY KEY '(' columnList ')'
1722
				{
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					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_PRIMARY;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = $4;
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					$$ = (Node *)n;
				}
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			| FOREIGN KEY '(' columnList ')' REFERENCES qualified_name
1732
				opt_column_list key_match key_actions ConstraintAttributeSpec
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				{
					FkConstraint *n = makeNode(FkConstraint);
					n->constr_name		= NULL;
1736
					n->pktable			= $7;
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					n->fk_attrs			= $4;
					n->pk_attrs			= $8;
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					n->fk_matchtype		= $9;
					n->fk_upd_action	= (char) ($10 >> 8);
					n->fk_del_action	= (char) ($10 & 0xFF);
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					n->deferrable		= ($11 & 1) != 0;
					n->initdeferred		= ($11 & 2) != 0;
					$$ = (Node *)n;
1745
				}
1746
		;
1747

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opt_column_list:
			'(' columnList ')'						{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
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		;

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columnList:
			columnElem								{ $$ = makeList1($1); }
			| columnList ',' columnElem				{ $$ = lappend($1, $3); }
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		;

1758
columnElem: ColId
1759
				{
1760
					$$ = (Node *) makeString($1);
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				}
		;

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key_match:  MATCH FULL
			{
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				$$ = FKCONSTR_MATCH_FULL;
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			}
		| MATCH PARTIAL
			{
1770 1771
				ereport(ERROR,
						(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1772
						 errmsg("MATCH PARTIAL not yet implemented")));
1773
				$$ = FKCONSTR_MATCH_PARTIAL;
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			}
		| MATCH SIMPLE
			{
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				$$ = FKCONSTR_MATCH_UNSPECIFIED;
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			}
		| /*EMPTY*/
			{
1781
				$$ = FKCONSTR_MATCH_UNSPECIFIED;
1782
			}
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		;

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/*
 * We combine the update and delete actions into one value temporarily
 * for simplicity of parsing, and then break them down again in the
 * calling production.  update is in the left 8 bits, delete in the right.
 * Note that NOACTION is the default.
 */
1791
key_actions:
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			key_update
				{ $$ = ($1 << 8) | (FKCONSTR_ACTION_NOACTION & 0xFF); }
			| key_delete
				{ $$ = (FKCONSTR_ACTION_NOACTION << 8) | ($1 & 0xFF); }
			| key_update key_delete
				{ $$ = ($1 << 8) | ($2 & 0xFF); }
			| key_delete key_update
				{ $$ = ($2 << 8) | ($1 & 0xFF); }
			| /*EMPTY*/
				{ $$ = (FKCONSTR_ACTION_NOACTION << 8) | (FKCONSTR_ACTION_NOACTION & 0xFF); }
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		;

1804
key_update: ON UPDATE key_action		{ $$ = $3; }
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		;

1807
key_delete: ON DELETE_P key_action		{ $$ = $3; }
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		;

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key_action:
			NO ACTION					{ $$ = FKCONSTR_ACTION_NOACTION; }
			| RESTRICT					{ $$ = FKCONSTR_ACTION_RESTRICT; }
			| CASCADE					{ $$ = FKCONSTR_ACTION_CASCADE; }
			| SET NULL_P				{ $$ = FKCONSTR_ACTION_SETNULL; }
			| SET DEFAULT				{ $$ = FKCONSTR_ACTION_SETDEFAULT; }
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		;

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OptInherit: INHERITS '(' qualified_name_list ')'	{ $$ = $3; }
			| /*EMPTY*/								{ $$ = NIL; }
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		;

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OptWithOids:
			WITH OIDS								{ $$ = TRUE; }
			| WITHOUT OIDS							{ $$ = FALSE; }
			| /*EMPTY*/								{ $$ = TRUE; }
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		;

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OnCommitOption:  ON COMMIT DROP				{ $$ = ONCOMMIT_DROP; }
			| ON COMMIT DELETE_P ROWS		{ $$ = ONCOMMIT_DELETE_ROWS; }
			| ON COMMIT PRESERVE ROWS		{ $$ = ONCOMMIT_PRESERVE_ROWS; }
			| /*EMPTY*/						{ $$ = ONCOMMIT_NOOP; }
		;


1835 1836 1837 1838 1839
/*
 * Note: CREATE TABLE ... AS SELECT ... is just another spelling for
 * SELECT ... INTO.
 */

1840 1841
CreateAsStmt:
			CREATE OptTemp TABLE qualified_name OptCreateAs AS SelectStmt
1842
				{
1843 1844 1845 1846
					/*
					 * When the SelectStmt is a set-operation tree, we must
					 * stuff the INTO information into the leftmost component
					 * Select, because that's where analyze.c will expect
1847
					 * to find it.	Similarly, the output column names must
1848 1849
					 * be attached to that Select's target list.
					 */
1850
					SelectStmt *n = findLeftmostSelect((SelectStmt *) $7);
1851
					if (n->into != NULL)
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						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("CREATE TABLE AS may not specify INTO")));
1855
					$4->istemp = $2;
1856
					n->into = $4;
1857
					n->intoColNames = $5;
1858
					$$ = $7;
1859 1860 1861
				}
		;

1862 1863 1864
OptCreateAs:
			'(' CreateAsList ')'					{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
1865 1866
		;

1867
CreateAsList:
1868 1869
			CreateAsElement							{ $$ = makeList1($1); }
			| CreateAsList ',' CreateAsElement		{ $$ = lappend($1, $3); }
1870 1871
		;

1872 1873
CreateAsElement:
			ColId
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				{
					ColumnDef *n = makeNode(ColumnDef);
					n->colname = $1;
					n->typename = NULL;
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					n->inhcount = 0;
					n->is_local = true;
1880
					n->is_not_null = false;
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					n->raw_default = NULL;
					n->cooked_default = NULL;
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					n->constraints = NIL;
					n->support = NULL;
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					$$ = (Node *)n;
				}
		;

1889

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/*****************************************************************************
 *
1892 1893
 *		QUERY :
 *				CREATE SEQUENCE seqname
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 *				ALTER SEQUENCE seqname
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 *
 *****************************************************************************/

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CreateSeqStmt:
			CREATE OptTemp SEQUENCE qualified_name OptSeqList
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				{
					CreateSeqStmt *n = makeNode(CreateSeqStmt);
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					$4->istemp = $2;
					n->sequence = $4;
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					n->options = $5;
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					$$ = (Node *)n;
				}
		;
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AlterSeqStmt:
			ALTER SEQUENCE qualified_name OptSeqList
				{
					AlterSeqStmt *n = makeNode(AlterSeqStmt);
					n->sequence = $3;
					n->options = $4;
					$$ = (Node *)n;
				}
		;

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OptSeqList: OptSeqList OptSeqElem					{ $$ = lappend($1, $2); }
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			| /*EMPTY*/								{ $$ = NIL; }
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		;

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OptSeqElem: CACHE NumericOnly
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				{
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					$$ = makeDefElem("cache", (Node *)$2);
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				}
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			| CYCLE
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				{
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					$$ = makeDefElem("cycle", (Node *)makeInteger(TRUE));
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				}
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			| NO CYCLE
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				{
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					$$ = makeDefElem("cycle", (Node *)makeInteger(FALSE));
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				}
			| INCREMENT opt_by NumericOnly
				{
					$$ = makeDefElem("increment", (Node *)$3);
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				}
1939
			| MAXVALUE NumericOnly
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				{
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					$$ = makeDefElem("maxvalue", (Node *)$2);
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				}
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			| MINVALUE NumericOnly
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				{
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					$$ = makeDefElem("minvalue", (Node *)$2);
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				}
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			| NO MAXVALUE
				{
					$$ = makeDefElem("maxvalue", (Node *)NULL);
				}
			| NO MINVALUE
				{
					$$ = makeDefElem("minvalue", (Node *)NULL);
				}
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			| START opt_with NumericOnly
1956
				{
1957
					$$ = makeDefElem("start", (Node *)$3);
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				}
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			| RESTART opt_with NumericOnly
				{
					$$ = makeDefElem("restart", (Node *)$3);
				}
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		;

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opt_by:		BY				{}
			| /* empty */	{}
	  ;

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NumericOnly:
			FloatOnly								{ $$ = $1; }
			| IntegerOnly							{ $$ = $1; }
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		;
1973

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FloatOnly:	FCONST									{ $$ = makeFloat($1); }
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			| '-' FCONST
				{
					$$ = makeFloat($2);
1978
					doNegateFloat($$);
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				}
		;

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IntegerOnly:
			Iconst
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				{
					$$ = makeInteger($1);
				}
			| '-' Iconst
				{
					$$ = makeInteger($2);
					$$->val.ival = - $$->val.ival;
				}
1992
		;
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/*****************************************************************************
 *
 *		QUERIES :
 *				CREATE PROCEDURAL LANGUAGE ...
 *				DROP PROCEDURAL LANGUAGE ...
 *
 *****************************************************************************/

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CreatePLangStmt:
			CREATE opt_trusted opt_procedural LANGUAGE ColId_or_Sconst
2004
			HANDLER handler_name opt_validator opt_lancompiler
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			{
				CreatePLangStmt *n = makeNode(CreatePLangStmt);
				n->plname = $5;
				n->plhandler = $7;
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				n->plvalidator = $8;
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				n->pltrusted = $2;
				$$ = (Node *)n;
			}
		;

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opt_trusted:
			TRUSTED									{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
2018
		;
2019

2020 2021 2022 2023
/* This ought to be just func_name, but that causes reduce/reduce conflicts
 * (CREATE LANGUAGE is the only place where func_name isn't followed by '(').
 * Work around by using name and dotted_name separately.
 */
2024
handler_name:
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			name
							{ $$ = makeList1(makeString($1)); }
2027
			| dotted_name							{ $$ = $1; }
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		;

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opt_lancompiler:
			LANCOMPILER Sconst						{ $$ = $2; }
			| /*EMPTY*/								{ $$ = ""; }
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		;
2034

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opt_validator:
			VALIDATOR handler_name { $$ = $2; }
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			| /*EMPTY*/ { $$ = NULL; }
		;

2040
DropPLangStmt:
2041
			DROP opt_procedural LANGUAGE ColId_or_Sconst opt_drop_behavior
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				{
					DropPLangStmt *n = makeNode(DropPLangStmt);
					n->plname = $4;
2045
					n->behavior = $5;
2046 2047
					$$ = (Node *)n;
				}
2048
		;
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2050
opt_procedural:
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			PROCEDURAL								{}
			| /*EMPTY*/								{}
2053
		;
2054

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/*****************************************************************************
 *
2057 2058 2059
 *		QUERIES :
 *				CREATE TRIGGER ...
 *				DROP TRIGGER ...
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 *
 *****************************************************************************/

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CreateTrigStmt:
			CREATE TRIGGER name TriggerActionTime TriggerEvents ON
			qualified_name TriggerForSpec EXECUTE PROCEDURE
			func_name '(' TriggerFuncArgs ')'
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				{
					CreateTrigStmt *n = makeNode(CreateTrigStmt);
					n->trigname = $3;
2070
					n->relation = $7;
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					n->funcname = $11;
					n->args = $13;
					n->before = $4;
					n->row = $8;
2075
					memcpy(n->actions, $5, 4);
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					n->isconstraint  = FALSE;
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					n->deferrable	 = FALSE;
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					n->initdeferred  = FALSE;
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					n->constrrel = NULL;
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					$$ = (Node *)n;
				}
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			| CREATE CONSTRAINT TRIGGER name AFTER TriggerEvents ON
			qualified_name OptConstrFromTable
			ConstraintAttributeSpec
			FOR EACH ROW EXECUTE PROCEDURE
			func_name '(' TriggerFuncArgs ')'
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				{
					CreateTrigStmt *n = makeNode(CreateTrigStmt);
					n->trigname = $4;
2090
					n->relation = $8;
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					n->funcname = $16;
					n->args = $18;
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					n->before = FALSE;
					n->row = TRUE;
2095
					memcpy(n->actions, $6, 4);
2096
					n->isconstraint  = TRUE;
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					n->deferrable = ($10 & 1) != 0;
					n->initdeferred = ($10 & 2) != 0;
2099

2100
					n->constrrel = $9;
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					$$ = (Node *)n;
				}
		;

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TriggerActionTime:
			BEFORE									{ $$ = TRUE; }
			| AFTER									{ $$ = FALSE; }
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		;

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TriggerEvents:
			TriggerOneEvent
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				{
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					char *e = palloc(4);
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					e[0] = $1; e[1] = '\0';
					$$ = e;
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				}
			| TriggerOneEvent OR TriggerOneEvent
				{
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					char *e = palloc(4);
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					e[0] = $1; e[1] = $3; e[2] = '\0';
					$$ = e;
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				}
			| TriggerOneEvent OR TriggerOneEvent OR TriggerOneEvent
				{
2125
					char *e = palloc(4);
2126
					e[0] = $1; e[1] = $3; e[2] = $5; e[3] = '\0';
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					$$ = e;
				}
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		;

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TriggerOneEvent:
			INSERT									{ $$ = 'i'; }
			| DELETE_P								{ $$ = 'd'; }
			| UPDATE								{ $$ = 'u'; }
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		;

2137 2138
TriggerForSpec:
			FOR TriggerForOpt TriggerForType
2139
				{
2140
					$$ = $3;
2141
				}
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			| /* EMPTY */
				{
					/*
					 * If ROW/STATEMENT not specified, default to
					 * STATEMENT, per SQL
					 */
					$$ = FALSE;
				}
2150
		;
2151

2152
TriggerForOpt:
2153 2154
			EACH									{}
			| /*EMPTY*/								{}
2155 2156
		;

2157 2158 2159
TriggerForType:
			ROW										{ $$ = TRUE; }
			| STATEMENT								{ $$ = FALSE; }
2160 2161
		;

2162 2163
TriggerFuncArgs:
			TriggerFuncArg							{ $$ = makeList1($1); }
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			| TriggerFuncArgs ',' TriggerFuncArg	{ $$ = lappend($1, $3); }
2165
			| /*EMPTY*/								{ $$ = NIL; }
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		;

2168 2169
TriggerFuncArg:
			ICONST
2170
				{
2171
					char buf[64];
2172
					snprintf(buf, sizeof(buf), "%d", $1);
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					$$ = makeString(pstrdup(buf));
				}
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			| FCONST								{ $$ = makeString($1); }
			| Sconst								{ $$ = makeString($1); }
2177 2178
			| BCONST								{ $$ = makeString($1); }
			| XCONST								{ $$ = makeString($1); }
2179 2180 2181 2182 2183 2184
			| ColId									{ $$ = makeString($1); }
		;

OptConstrFromTable:
			FROM qualified_name						{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NULL; }
2185
		;
2186

2187 2188 2189 2190
ConstraintAttributeSpec:
			ConstraintDeferrabilitySpec
				{ $$ = $1; }
			| ConstraintDeferrabilitySpec ConstraintTimeSpec
2191
				{
2192
					if ($1 == 0 && $2 != 0)
2193 2194
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
2195
								 errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE")));
2196
					$$ = $1 | $2;
2197
				}
2198
			| ConstraintTimeSpec
2199
				{
2200 2201 2202 2203
					if ($1 != 0)
						$$ = 3;
					else
						$$ = 0;
2204
				}
2205 2206 2207
			| ConstraintTimeSpec ConstraintDeferrabilitySpec
				{
					if ($2 == 0 && $1 != 0)
2208 2209
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
2210
								 errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE")));
2211 2212 2213 2214
					$$ = $1 | $2;
				}
			| /*EMPTY*/
				{ $$ = 0; }
2215 2216
		;

2217 2218 2219
ConstraintDeferrabilitySpec:
			NOT DEFERRABLE							{ $$ = 0; }
			| DEFERRABLE							{ $$ = 1; }
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		;

2222 2223 2224
ConstraintTimeSpec:
			INITIALLY IMMEDIATE						{ $$ = 0; }
			| INITIALLY DEFERRED					{ $$ = 2; }
2225
		;
2226

2227

2228
DropTrigStmt:
2229
			DROP TRIGGER name ON qualified_name opt_drop_behavior
2230
				{
2231
					DropPropertyStmt *n = makeNode(DropPropertyStmt);
2232
					n->relation = $5;
2233
					n->property = $3;
2234
					n->behavior = $6;
2235
					n->removeType = OBJECT_TRIGGER;
2236 2237 2238
					$$ = (Node *) n;
				}
		;
2239

2240

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/*****************************************************************************
 *
 *		QUERIES :
 *				CREATE ASSERTION ...
 *				DROP ASSERTION ...
 *
 *****************************************************************************/

2249
CreateAssertStmt:
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			CREATE ASSERTION name CHECK '(' a_expr ')'
			ConstraintAttributeSpec
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				{
					CreateTrigStmt *n = makeNode(CreateTrigStmt);
					n->trigname = $3;
					n->args = makeList1($6);
					n->isconstraint  = TRUE;
					n->deferrable = ($8 & 1) != 0;
					n->initdeferred = ($8 & 2) != 0;

2260 2261 2262
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("CREATE ASSERTION is not yet implemented")));
2263 2264 2265 2266 2267

					$$ = (Node *)n;
				}
		;

2268
DropAssertStmt:
2269
			DROP ASSERTION name opt_drop_behavior
2270 2271 2272 2273
				{
					DropPropertyStmt *n = makeNode(DropPropertyStmt);
					n->relation = NULL;
					n->property = $3;
2274
					n->behavior = $4;
2275
					n->removeType = OBJECT_TRIGGER; /* XXX */
2276 2277 2278
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("DROP ASSERTION is not yet implemented")));
2279 2280 2281 2282 2283
					$$ = (Node *) n;
				}
		;


2284 2285
/*****************************************************************************
 *
2286
 *		QUERY :
2287
 *				define (aggregate,operator,type)
2288 2289 2290
 *
 *****************************************************************************/

2291 2292
DefineStmt:
			CREATE AGGREGATE func_name definition
2293
				{
2294
					DefineStmt *n = makeNode(DefineStmt);
2295
					n->kind = OBJECT_AGGREGATE;
2296
					n->defnames = $3;
2297 2298 2299
					n->definition = $4;
					$$ = (Node *)n;
				}
2300
			| CREATE OPERATOR any_operator definition
2301 2302
				{
					DefineStmt *n = makeNode(DefineStmt);
2303
					n->kind = OBJECT_OPERATOR;
2304
					n->defnames = $3;
2305 2306 2307
					n->definition = $4;
					$$ = (Node *)n;
				}
2308
			| CREATE TYPE_P any_name definition
2309 2310
				{
					DefineStmt *n = makeNode(DefineStmt);
2311
					n->kind = OBJECT_TYPE;
2312
					n->defnames = $3;
2313 2314
					n->definition = $4;
					$$ = (Node *)n;
2315
				}
2316
			| CREATE TYPE_P any_name AS '(' TableFuncElementList ')'
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				{
					CompositeTypeStmt *n = makeNode(CompositeTypeStmt);
					RangeVar *r = makeNode(RangeVar);

2321
					/* can't use qualified_name, sigh */
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					switch (length($3))
					{
						case 1:
							r->catalogname = NULL;
							r->schemaname = NULL;
							r->relname = strVal(lfirst($3));
							break;
						case 2:
							r->catalogname = NULL;
							r->schemaname = strVal(lfirst($3));
							r->relname = strVal(lsecond($3));
							break;
						case 3:
							r->catalogname = strVal(lfirst($3));
							r->schemaname = strVal(lsecond($3));
2337
							r->relname = strVal(lthird($3));
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							break;
						default:
2340 2341 2342 2343
							ereport(ERROR,
									(errcode(ERRCODE_SYNTAX_ERROR),
									 errmsg("improper qualified name (too many dotted names): %s",
											NameListToString($3))));
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							break;
					}
					n->typevar = r;
2347
					n->coldeflist = $6;
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					$$ = (Node *)n;
				}
2350
		;
2351

2352
definition: '(' def_list ')'						{ $$ = $2; }
2353
		;
2354

2355
def_list:  	def_elem								{ $$ = makeList1($1); }
2356
			| def_list ',' def_elem					{ $$ = lappend($1, $3); }
2357
		;
2358

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def_elem:  ColLabel '=' def_arg
2360
				{
2361
					$$ = makeDefElem($1, (Node *)$3);
2362
				}
2363
			| ColLabel
2364
				{
2365
					$$ = makeDefElem($1, (Node *)NULL);
2366 2367 2368
				}
		;

2369
/* Note: any simple identifier will be returned as a type name! */
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def_arg:	func_return						{ $$ = (Node *)$1; }
2371
			| qual_all_Op					{ $$ = (Node *)$1; }
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			| NumericOnly					{ $$ = (Node *)$1; }
			| Sconst						{ $$ = (Node *)makeString($1); }
2374
		;
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/*****************************************************************************
 *
 *		QUERIES :
 *				CREATE OPERATOR CLASS ...
 *				DROP OPERATOR CLASS ...
 *
 *****************************************************************************/

CreateOpClassStmt:
			CREATE OPERATOR CLASS any_name opt_default FOR TYPE_P Typename
			USING access_method AS opclass_item_list
				{
					CreateOpClassStmt *n = makeNode(CreateOpClassStmt);
					n->opclassname = $4;
					n->isDefault = $5;
					n->datatype = $8;
					n->amname = $10;
					n->items = $12;
					$$ = (Node *) n;
				}
		;

opclass_item_list:
			opclass_item							{ $$ = makeList1($1); }
			| opclass_item_list ',' opclass_item	{ $$ = lappend($1, $3); }
		;

opclass_item:
			OPERATOR Iconst any_operator opt_recheck
				{
					CreateOpClassItem *n = makeNode(CreateOpClassItem);
					n->itemtype = OPCLASS_ITEM_OPERATOR;
					n->name = $3;
					n->args = NIL;
					n->number = $2;
					n->recheck = $4;
					$$ = (Node *) n;
				}
			| OPERATOR Iconst any_operator '(' oper_argtypes ')' opt_recheck
				{
					CreateOpClassItem *n = makeNode(CreateOpClassItem);
					n->itemtype = OPCLASS_ITEM_OPERATOR;
					n->name = $3;
					n->args = $5;
					n->number = $2;
					n->recheck = $7;
					$$ = (Node *) n;
				}
			| FUNCTION Iconst func_name func_args
				{
					CreateOpClassItem *n = makeNode(CreateOpClassItem);
					n->itemtype = OPCLASS_ITEM_FUNCTION;
					n->name = $3;
					n->args = $4;
					n->number = $2;
					$$ = (Node *) n;
				}
			| STORAGE Typename
				{
					CreateOpClassItem *n = makeNode(CreateOpClassItem);
					n->itemtype = OPCLASS_ITEM_STORAGETYPE;
					n->storedtype = $2;
					$$ = (Node *) n;
				}
		;

opt_default:	DEFAULT	{ $$ = TRUE; }
			| /*EMPTY*/	{ $$ = FALSE; }
		;

opt_recheck:	RECHECK	{ $$ = TRUE; }
			| /*EMPTY*/	{ $$ = FALSE; }
		;


DropOpClassStmt:
			DROP OPERATOR CLASS any_name USING access_method opt_drop_behavior
				{
					RemoveOpClassStmt *n = makeNode(RemoveOpClassStmt);
					n->opclassname = $4;
					n->amname = $6;
					n->behavior = $7;
					$$ = (Node *) n;
				}
		;


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/*****************************************************************************
 *
2466
 *		QUERY:
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 *
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 *		DROP itemtype itemname [, itemname ...] [ RESTRICT | CASCADE ]
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 *
 *****************************************************************************/

2472
DropStmt:	DROP drop_type any_name_list opt_drop_behavior
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				{
					DropStmt *n = makeNode(DropStmt);
2475
					n->removeType = $2;
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					n->objects = $3;
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					n->behavior = $4;
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					$$ = (Node *)n;
				}
		;
2481

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drop_type:	TABLE									{ $$ = OBJECT_TABLE; }
			| SEQUENCE								{ $$ = OBJECT_SEQUENCE; }
			| VIEW									{ $$ = OBJECT_VIEW; }
			| INDEX									{ $$ = OBJECT_INDEX; }
			| TYPE_P								{ $$ = OBJECT_TYPE; }
			| DOMAIN_P								{ $$ = OBJECT_DOMAIN; }
			| CONVERSION_P							{ $$ = OBJECT_CONVERSION; }
			| SCHEMA								{ $$ = OBJECT_SCHEMA; }
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		;

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any_name_list:
			any_name								{ $$ = makeList1($1); }
			| any_name_list ',' any_name			{ $$ = lappend($1, $3); }
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		;

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any_name:	ColId						{ $$ = makeList1(makeString($1)); }
			| dotted_name				{ $$ = $1; }
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		;

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/*****************************************************************************
 *
 *		QUERY:
 *				truncate table relname
 *
 *****************************************************************************/

2508 2509
TruncateStmt:
			TRUNCATE opt_table qualified_name
2510 2511
				{
					TruncateStmt *n = makeNode(TruncateStmt);
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					n->relation = $3;
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					$$ = (Node *)n;
				}
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		;
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/*****************************************************************************
 *
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 *	The COMMENT ON statement can take different forms based upon the type of
 *	the object associated with the comment. The form of the statement is:
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 *
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 *	COMMENT ON [ [ DATABASE | DOMAIN | INDEX | SEQUENCE | TABLE | TYPE | VIEW |
 *				   CONVERSION | LANGUAGE | OPERATOR CLASS | LARGE OBJECT |
 *				   CAST ] <objname> |
 *				 AGGREGATE <aggname> (<aggtype>) |
 *				 FUNCTION <funcname> (arg1, arg2, ...) |
 *				 OPERATOR <op> (leftoperand_typ, rightoperand_typ) |
 *				 TRIGGER <triggername> ON <relname> |
 *				 RULE <rulename> ON <relname> ]
 *			   IS 'text'
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 *
 *****************************************************************************/
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CommentStmt:
			COMMENT ON comment_type any_name IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = $3;
					n->objname = $4;
					n->objargs = NIL;
					n->comment = $6;
					$$ = (Node *) n;
				}
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			| COMMENT ON AGGREGATE func_name '(' aggr_argtype ')'
			IS comment_text
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				{
					CommentStmt *n = makeNode(CommentStmt);
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					n->objtype = OBJECT_AGGREGATE;
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					n->objname = $4;
					n->objargs = makeList1($6);
					n->comment = $9;
					$$ = (Node *) n;
				}
			| COMMENT ON FUNCTION func_name func_args IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
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					n->objtype = OBJECT_FUNCTION;
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					n->objname = $4;
					n->objargs = $5;
					n->comment = $7;
					$$ = (Node *) n;
				}
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			| COMMENT ON OPERATOR any_operator '(' oper_argtypes ')'
			IS comment_text
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				{
					CommentStmt *n = makeNode(CommentStmt);
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					n->objtype = OBJECT_OPERATOR;
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					n->objname = $4;
					n->objargs = $6;
					n->comment = $9;
					$$ = (Node *) n;
				}
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			| COMMENT ON CONSTRAINT name ON any_name IS comment_text
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				{
					CommentStmt *n = makeNode(CommentStmt);
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					n->objtype = OBJECT_CONSTRAINT;
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					n->objname = lappend($6, makeString($4));
					n->objargs = NIL;
					n->comment = $8;
					$$ = (Node *) n;
				}
			| COMMENT ON RULE name ON any_name IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
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					n->objtype = OBJECT_RULE;
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					n->objname = lappend($6, makeString($4));
					n->objargs = NIL;
					n->comment = $8;
					$$ = (Node *) n;
				}
			| COMMENT ON RULE name IS comment_text
				{
					/* Obsolete syntax supported for awhile for compatibility */
					CommentStmt *n = makeNode(CommentStmt);
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					n->objtype = OBJECT_RULE;
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					n->objname = makeList1(makeString($4));
					n->objargs = NIL;
					n->comment = $6;
					$$ = (Node *) n;
				}
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			| COMMENT ON TRIGGER name ON any_name IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
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					n->objtype = OBJECT_TRIGGER;
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					n->objname = lappend($6, makeString($4));
					n->objargs = NIL;
					n->comment = $8;
					$$ = (Node *) n;
				}
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			| COMMENT ON OPERATOR CLASS any_name USING access_method IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_OPCLASS;
					n->objname = $5;
					n->objargs = makeList1(makeString($7));
					n->comment = $9;
					$$ = (Node *) n;
				}
			| COMMENT ON LARGE_P OBJECT_P NumericOnly IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_LARGEOBJECT;
					n->objname = makeList1($5);
					n->objargs = NIL;
					n->comment = $7;
					$$ = (Node *) n;
				}
			| COMMENT ON CAST '(' Typename AS Typename ')' IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_CAST;
					n->objname = makeList1($5);
					n->objargs = makeList1($7);
					n->comment = $10;
					$$ = (Node *) n;
				}
			| COMMENT ON opt_procedural LANGUAGE any_name IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_LANGUAGE;
					n->objname = $5;
					n->objargs = NIL;
					n->comment = $7;
					$$ = (Node *) n;
				}				
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		;

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comment_type:
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			COLUMN								{ $$ = OBJECT_COLUMN; }
			| DATABASE							{ $$ = OBJECT_DATABASE; }
			| SCHEMA							{ $$ = OBJECT_SCHEMA; }
			| INDEX								{ $$ = OBJECT_INDEX; }
			| SEQUENCE							{ $$ = OBJECT_SEQUENCE; }
			| TABLE								{ $$ = OBJECT_TABLE; }
			| DOMAIN_P							{ $$ = OBJECT_TYPE; }
			| TYPE_P							{ $$ = OBJECT_TYPE; }
			| VIEW								{ $$ = OBJECT_VIEW; }
2658
			| CONVERSION_P						{ $$ = OBJECT_CONVERSION; }
2659
		;
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comment_text:
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			Sconst								{ $$ = $1; }
			| NULL_P							{ $$ = NULL; }
2664
		;
2665

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/*****************************************************************************
 *
2668
 *		QUERY:
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 *			fetch/move
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 *
 *****************************************************************************/

2673
FetchStmt:	FETCH fetch_direction from_in name
2674
				{
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					FetchStmt *n = (FetchStmt *) $2;
					n->portalname = $4;
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					n->ismove = FALSE;
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					$$ = (Node *)n;
				}
2680
			| FETCH name
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				{
					FetchStmt *n = makeNode(FetchStmt);
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					n->direction = FETCH_FORWARD;
					n->howMany = 1;
					n->portalname = $2;
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					n->ismove = FALSE;
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					$$ = (Node *)n;
				}
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			| MOVE fetch_direction from_in name
2690
				{
2691
					FetchStmt *n = (FetchStmt *) $2;
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					n->portalname = $4;
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					n->ismove = TRUE;
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					$$ = (Node *)n;
				}
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			| MOVE name
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				{
					FetchStmt *n = makeNode(FetchStmt);
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					n->direction = FETCH_FORWARD;
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					n->howMany = 1;
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					n->portalname = $2;
					n->ismove = TRUE;
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					$$ = (Node *)n;
				}
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		;

fetch_direction:
			/*EMPTY*/
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				{
					FetchStmt *n = makeNode(FetchStmt);
2711
					n->direction = FETCH_FORWARD;
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					n->howMany = 1;
					$$ = (Node *)n;
				}
2715
			| NEXT
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				{
					FetchStmt *n = makeNode(FetchStmt);
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					n->direction = FETCH_FORWARD;
					n->howMany = 1;
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					$$ = (Node *)n;
				}
2722
			| PRIOR
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				{
					FetchStmt *n = makeNode(FetchStmt);
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					n->direction = FETCH_BACKWARD;
					n->howMany = 1;
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					$$ = (Node *)n;
				}
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			| FIRST_P
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				{
					FetchStmt *n = makeNode(FetchStmt);
2732
					n->direction = FETCH_ABSOLUTE;
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					n->howMany = 1;
					$$ = (Node *)n;
				}
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			| LAST_P
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_ABSOLUTE;
					n->howMany = -1;
					$$ = (Node *)n;
				}
2743
			| ABSOLUTE_P fetch_count
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				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_ABSOLUTE;
					n->howMany = $2;
					$$ = (Node *)n;
				}
2750
			| RELATIVE_P fetch_count
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				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_RELATIVE;
					n->howMany = $2;
					$$ = (Node *)n;
				}
			| fetch_count
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = $1;
					$$ = (Node *)n;
				}
			| ALL
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = FETCH_ALL;
					$$ = (Node *)n;
				}
			| FORWARD
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				{
					FetchStmt *n = makeNode(FetchStmt);
2774
					n->direction = FETCH_FORWARD;
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					n->howMany = 1;
					$$ = (Node *)n;
				}
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			| FORWARD fetch_count
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				{
					FetchStmt *n = makeNode(FetchStmt);
2781
					n->direction = FETCH_FORWARD;
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					n->howMany = $2;
					$$ = (Node *)n;
				}
			| FORWARD ALL
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = FETCH_ALL;
					$$ = (Node *)n;
				}
			| BACKWARD
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_BACKWARD;
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					n->howMany = 1;
					$$ = (Node *)n;
				}
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			| BACKWARD fetch_count
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_BACKWARD;
					n->howMany = $2;
					$$ = (Node *)n;
				}
			| BACKWARD ALL
2807
				{
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					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_BACKWARD;
					n->howMany = FETCH_ALL;
					$$ = (Node *)n;
2812
				}
2813
		;
2814

2815
fetch_count:
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			Iconst									{ $$ = $1; }
			| '-' Iconst							{ $$ = - $2; }
2818
		;
2819

2820 2821
from_in:	FROM									{}
			| IN_P									{}
2822
		;
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2824

2825 2826
/*****************************************************************************
 *
2827
 * GRANT and REVOKE statements
2828 2829 2830
 *
 *****************************************************************************/

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GrantStmt:	GRANT privileges ON privilege_target TO grantee_list
			opt_grant_grant_option
2833
				{
2834 2835 2836
					GrantStmt *n = makeNode(GrantStmt);
					n->is_grant = true;
					n->privileges = $2;
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					n->objtype = ($4)->objtype;
					n->objects = ($4)->objs;
					n->grantees = $6;
2840
					n->grant_option = $7;
2841
					$$ = (Node*)n;
2842 2843
				}
		;
2844

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2845
RevokeStmt: REVOKE opt_revoke_grant_option privileges ON privilege_target
2846
			FROM grantee_list opt_drop_behavior
2847
				{
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					GrantStmt *n = makeNode(GrantStmt);
					n->is_grant = false;
					n->privileges = $3;
					n->objtype = ($5)->objtype;
					n->objects = ($5)->objs;
					n->grantees = $7;
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					n->grant_option = $2;
					n->behavior = $8;
2856

2857
					$$ = (Node *)n;
2858 2859 2860
				}
		;

2861 2862

/* either ALL [PRIVILEGES] or a list of individual privileges */
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privileges: privilege_list				{ $$ = $1; }
			| ALL						{ $$ = makeListi1(ACL_ALL_RIGHTS); }
			| ALL PRIVILEGES			{ $$ = makeListi1(ACL_ALL_RIGHTS); }
2866 2867
		;

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privilege_list:
			privilege								{ $$ = makeListi1($1); }
			| privilege_list ',' privilege			{ $$ = lappendi($1, $3); }
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		;

/* Not all of these privilege types apply to all objects, but that
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 * gets sorted out later.
 */
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privilege:	SELECT									{ $$ = ACL_SELECT; }
			| INSERT								{ $$ = ACL_INSERT; }
			| UPDATE								{ $$ = ACL_UPDATE; }
			| DELETE_P								{ $$ = ACL_DELETE; }
			| RULE									{ $$ = ACL_RULE; }
			| REFERENCES							{ $$ = ACL_REFERENCES; }
			| TRIGGER								{ $$ = ACL_TRIGGER; }
			| EXECUTE								{ $$ = ACL_EXECUTE; }
			| USAGE									{ $$ = ACL_USAGE; }
			| CREATE								{ $$ = ACL_CREATE; }
			| TEMPORARY								{ $$ = ACL_CREATE_TEMP; }
			| TEMP									{ $$ = ACL_CREATE_TEMP; }
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		;


/* Don't bother trying to fold the first two rules into one using
   opt_table.  You're going to get conflicts. */
2893 2894
privilege_target:
			qualified_name_list
2895
				{
2896
					PrivTarget *n = makeNode(PrivTarget);
2897
					n->objtype = ACL_OBJECT_RELATION;
2898 2899
					n->objs = $1;
					$$ = n;
2900
				}
2901
			| TABLE qualified_name_list
2902
				{
2903
					PrivTarget *n = makeNode(PrivTarget);
2904
					n->objtype = ACL_OBJECT_RELATION;
2905 2906
					n->objs = $2;
					$$ = n;
2907
				}
2908
			| FUNCTION function_with_argtypes_list
2909
				{
2910
					PrivTarget *n = makeNode(PrivTarget);
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					n->objtype = ACL_OBJECT_FUNCTION;
					n->objs = $2;
					$$ = n;
				}
			| DATABASE name_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_DATABASE;
2919 2920
					n->objs = $2;
					$$ = n;
2921
				}
2922
			| LANGUAGE name_list
2923
				{
2924
					PrivTarget *n = makeNode(PrivTarget);
2925 2926 2927 2928 2929 2930 2931 2932
					n->objtype = ACL_OBJECT_LANGUAGE;
					n->objs = $2;
					$$ = n;
				}
			| SCHEMA name_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_NAMESPACE;
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					n->objs = $2;
					$$ = n;
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				}
		;

2938

2939 2940 2941
grantee_list:
			grantee									{ $$ = makeList1($1); }
			| grantee_list ',' grantee				{ $$ = lappend($1, $3); }
2942 2943
		;

2944
grantee:	ColId
2945
				{
2946
					PrivGrantee *n = makeNode(PrivGrantee);
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					/* This hack lets us avoid reserving PUBLIC as a keyword*/
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					if (strcmp($1, "public") == 0)
						n->username = NULL;
					else
						n->username = $1;
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					n->groupname = NULL;
					$$ = (Node *)n;
2954
				}
2955
			| GROUP_P ColId
2956
				{
2957
					PrivGrantee *n = makeNode(PrivGrantee);
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					/* Treat GROUP PUBLIC as a synonym for PUBLIC */
					if (strcmp($2, "public") == 0)
						n->groupname = NULL;
					else
						n->groupname = $2;
2963 2964
					n->username = NULL;
					$$ = (Node *)n;
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				}
		;
2967

2968

2969
opt_grant_grant_option:
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			WITH GRANT OPTION { $$ = TRUE; }
			| /*EMPTY*/ { $$ = FALSE; }
2972
		;
2973

2974
opt_revoke_grant_option:
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			GRANT OPTION FOR { $$ = TRUE; }
			| /*EMPTY*/ { $$ = FALSE; }
2977 2978
		;

2979

2980
function_with_argtypes_list:
2981
			function_with_argtypes					{ $$ = makeList1($1); }
2982
			| function_with_argtypes_list ',' function_with_argtypes
2983
													{ $$ = lappend($1, $3); }
2984
		;
2985

2986 2987
function_with_argtypes:
			func_name func_args
2988
				{
2989 2990 2991
					FuncWithArgs *n = makeNode(FuncWithArgs);
					n->funcname = $1;
					n->funcargs = $2;
2992
					$$ = (Node *)n;
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				}
		;
2995

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/*****************************************************************************
 *
2999
 *		QUERY:
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 *				create index <indexname> on <relname>
3001
 *				  [ using <access> ] "(" ( <col> [ using <opclass> ] )+ ")"
3002
 *				  [ where <predicate> ]
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 *
 *****************************************************************************/

3006
IndexStmt:	CREATE index_opt_unique INDEX index_name ON qualified_name
3007
			access_method_clause '(' index_params ')' where_clause
3008 3009 3010 3011
				{
					IndexStmt *n = makeNode(IndexStmt);
					n->unique = $2;
					n->idxname = $4;
3012
					n->relation = $6;
3013 3014
					n->accessMethod = $7;
					n->indexParams = $9;
3015
					n->whereClause = $11;
3016 3017 3018 3019
					$$ = (Node *)n;
				}
		;

3020
index_opt_unique:
3021 3022
			UNIQUE									{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
3023 3024
		;

3025
access_method_clause:
3026 3027
			USING access_method						{ $$ = $2; }
			| /*EMPTY*/								{ $$ = DEFAULT_INDEX_TYPE; }
3028
		;
3029

3030 3031
index_params:	index_elem							{ $$ = makeList1($1); }
			| index_params ',' index_elem			{ $$ = lappend($1, $3); }
3032 3033
		;

3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046
/*
 * Index attributes can be either simple column references, or arbitrary
 * expressions in parens.  For backwards-compatibility reasons, we allow
 * an expression that's just a function call to be written without parens.
 */
index_elem:	attr_name opt_class
				{
					$$ = makeNode(IndexElem);
					$$->name = $1;
					$$->expr = NULL;
					$$->opclass = $2;
				}
			| func_name '(' expr_list ')' opt_class
3047
				{
3048 3049 3050 3051 3052 3053
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;

3054
					$$ = makeNode(IndexElem);
3055
					$$->name = NULL;
3056
					$$->expr = (Node *)n;
3057
					$$->opclass = $5;
3058
				}
3059
			| '(' a_expr ')' opt_class
3060 3061
				{
					$$ = makeNode(IndexElem);
3062 3063 3064
					$$->name = NULL;
					$$->expr = $2;
					$$->opclass = $4;
3065 3066 3067
				}
		;

3068
opt_class:	any_name								{ $$ = $1; }
3069 3070
			| USING any_name						{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
3071 3072
		;

3073 3074
/*****************************************************************************
 *
3075
 *		QUERY:
3076
 *				create [or replace] function <fname>
3077 3078 3079
 *						[(<type-1> { , <type-n>})]
 *						returns <type-r>
 *						as <filename or code in language as appropriate>
3080
 *						language <lang> [with parameters]
3081 3082 3083
 *
 *****************************************************************************/

3084 3085 3086
CreateFunctionStmt:
			CREATE opt_or_replace FUNCTION func_name func_args
			RETURNS func_return createfunc_opt_list opt_definition
3087
				{
3088
					CreateFunctionStmt *n = makeNode(CreateFunctionStmt);
3089
					n->replace = $2;
3090
					n->funcname = $4;
3091
					n->argTypes = $5;
3092
					n->returnType = $7;
3093 3094
					n->options = $8;
					n->withClause = $9;
3095
					$$ = (Node *)n;
3096 3097
				}
		;
3098

3099 3100 3101
opt_or_replace:
			OR REPLACE								{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
3102 3103
		;

3104 3105
func_args:	'(' func_args_list ')'					{ $$ = $2; }
			| '(' ')'								{ $$ = NIL; }
3106
		;
3107

3108 3109 3110
func_args_list:
			func_arg								{ $$ = makeList1($1); }
			| func_args_list ',' func_arg			{ $$ = lappend($1, $3); }
3111 3112
		;

3113
func_arg:	opt_arg func_type
3114
				{
3115 3116 3117 3118
					/* We can catch over-specified arguments here if we want to,
					 * but for now better to silently swallow typmod, etc.
					 * - thomas 2000-03-22
					 */
3119 3120
					$$ = $2;
				}
3121
			| func_type								{ $$ = $1; }
3122 3123
		;

3124 3125
opt_arg:	IN_P									{ $$ = FALSE; }
			| OUT_P
3126
				{
3127 3128 3129
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("CREATE FUNCTION / OUT parameters are not implemented")));
3130 3131
					$$ = TRUE;
				}
3132
			| INOUT
3133
				{
3134 3135 3136
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("CREATE FUNCTION / INOUT parameters are not implemented")));
3137 3138 3139 3140
					$$ = FALSE;
				}
		;

3141 3142
func_return:
			func_type
3143
				{
3144 3145 3146 3147 3148 3149
					/* We can catch over-specified arguments here if we want to,
					 * but for now better to silently swallow typmod, etc.
					 * - thomas 2000-03-22
					 */
					$$ = $1;
				}
3150 3151
		;

3152
/*
3153
 * We would like to make the second production here be ColId attrs etc,
3154
 * but that causes reduce/reduce conflicts.  type_name is next best choice.
3155
 */
3156 3157
func_type:	Typename								{ $$ = $1; }
			| type_name attrs '%' TYPE_P
3158 3159
				{
					$$ = makeNode(TypeName);
3160 3161
					$$->names = lcons(makeString($1), $2);
					$$->pct_type = true;
3162 3163 3164
					$$->typmod = -1;
				}
		;
3165

3166

3167
createfunc_opt_list:
3168 3169 3170 3171
			/* Must be at least one to prevent conflict */
			createfunc_opt_item                     { $$ = makeList1($1); }
			| createfunc_opt_list createfunc_opt_item { $$ = lappend($1, $2); }
	;
3172

3173 3174
createfunc_opt_item:
			AS func_as
3175
				{
3176
					$$ = makeDefElem("as", (Node *)$2);
3177
				}
3178
			| LANGUAGE ColId_or_Sconst
3179
				{
3180
					$$ = makeDefElem("language", (Node *)makeString($2));
3181
				}
3182
			| IMMUTABLE
3183
				{
3184
					$$ = makeDefElem("volatility", (Node *)makeString("immutable"));
3185
				}
3186
			| STABLE
3187
				{
3188
					$$ = makeDefElem("volatility", (Node *)makeString("stable"));
3189
				}
3190
			| VOLATILE
3191
				{
3192
					$$ = makeDefElem("volatility", (Node *)makeString("volatile"));
3193
				}
3194
			| CALLED ON NULL_P INPUT_P
3195
				{
3196
					$$ = makeDefElem("strict", (Node *)makeInteger(FALSE));
3197
				}
3198
			| RETURNS NULL_P ON NULL_P INPUT_P
3199
				{
3200
					$$ = makeDefElem("strict", (Node *)makeInteger(TRUE));
3201
				}
3202
			| STRICT_P
3203
				{
3204
					$$ = makeDefElem("strict", (Node *)makeInteger(TRUE));
3205
				}
3206
			| EXTERNAL SECURITY DEFINER
3207
				{
3208
					$$ = makeDefElem("security", (Node *)makeInteger(TRUE));
3209
				}
3210
			| EXTERNAL SECURITY INVOKER
3211
				{
3212
					$$ = makeDefElem("security", (Node *)makeInteger(FALSE));
3213
				}
3214
			| SECURITY DEFINER
3215
				{
3216
					$$ = makeDefElem("security", (Node *)makeInteger(TRUE));
3217
				}
3218
			| SECURITY INVOKER
3219
				{
3220
					$$ = makeDefElem("security", (Node *)makeInteger(FALSE));
3221 3222 3223
				}
		;

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3224 3225 3226 3227 3228
func_as:	Sconst						{ $$ = makeList1(makeString($1)); }
			| Sconst ',' Sconst
				{
					$$ = makeList2(makeString($1), makeString($3));
				}
3229 3230
		;

3231 3232 3233
opt_definition:
			WITH definition							{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
3234 3235 3236
		;


3237 3238
/*****************************************************************************
 *
3239
 *		QUERY:
3240
 *
3241 3242 3243
 *		DROP FUNCTION funcname (arg1, arg2, ...) [ RESTRICT | CASCADE ]
 *		DROP AGGREGATE aggname (aggtype) [ RESTRICT | CASCADE ]
 *		DROP OPERATOR opname (leftoperand_typ, rightoperand_typ) [ RESTRICT | CASCADE ]
3244 3245 3246
 *
 *****************************************************************************/

3247
RemoveFuncStmt:
3248
			DROP FUNCTION func_name func_args opt_drop_behavior
3249
				{
3250 3251 3252
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->funcname = $3;
					n->args = $4;
3253
					n->behavior = $5;
3254 3255
					$$ = (Node *)n;
				}
3256 3257
		;

3258
RemoveAggrStmt:
3259
			DROP AGGREGATE func_name '(' aggr_argtype ')' opt_drop_behavior
3260 3261 3262
				{
						RemoveAggrStmt *n = makeNode(RemoveAggrStmt);
						n->aggname = $3;
3263
						n->aggtype = $5;
3264
						n->behavior = $7;
3265 3266 3267 3268
						$$ = (Node *)n;
				}
		;

3269 3270 3271
aggr_argtype:
			Typename								{ $$ = $1; }
			| '*'									{ $$ = NULL; }
3272
		;
3273

3274
RemoveOperStmt:
3275
			DROP OPERATOR any_operator '(' oper_argtypes ')' opt_drop_behavior
3276 3277 3278 3279
				{
					RemoveOperStmt *n = makeNode(RemoveOperStmt);
					n->opname = $3;
					n->args = $5;
3280
					n->behavior = $7;
3281 3282 3283
					$$ = (Node *)n;
				}
		;
3284

3285 3286
oper_argtypes:
			Typename
3287
				{
3288 3289
				   ereport(ERROR,
						   (errcode(ERRCODE_SYNTAX_ERROR),
3290 3291
							errmsg("missing argument"),
							errhint("Use NONE to denote the missing argument of a unary operator.")));
3292
				}
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3293 3294 3295 3296 3297 3298
			| Typename ',' Typename
					{ $$ = makeList2($1, $3); }
			| NONE ',' Typename /* left unary */
					{ $$ = makeList2(NULL, $3); }
			| Typename ',' NONE /* right unary */
					{ $$ = makeList2($1, NULL); }
3299
		;
3300

3301
any_operator:
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3302 3303 3304 3305
			all_Op
					{ $$ = makeList1(makeString($1)); }
			| ColId '.' any_operator
					{ $$ = lcons(makeString($1), $3); }
3306 3307
		;

3308

3309 3310 3311 3312 3313 3314
/*****************************************************************************
 *
 *		CREATE CAST / DROP CAST
 *
 *****************************************************************************/

3315
CreateCastStmt: CREATE CAST '(' Typename AS Typename ')'
3316
					WITH FUNCTION function_with_argtypes cast_context
3317 3318 3319 3320 3321
				{
					CreateCastStmt *n = makeNode(CreateCastStmt);
					n->sourcetype = $4;
					n->targettype = $6;
					n->func = (FuncWithArgs *) $10;
3322
					n->context = (CoercionContext) $11;
3323 3324
					$$ = (Node *)n;
				}
3325
			| CREATE CAST '(' Typename AS Typename ')'
3326
					WITHOUT FUNCTION cast_context
3327 3328 3329 3330 3331
				{
					CreateCastStmt *n = makeNode(CreateCastStmt);
					n->sourcetype = $4;
					n->targettype = $6;
					n->func = NULL;
3332
					n->context = (CoercionContext) $10;
3333 3334
					$$ = (Node *)n;
				}
3335
		;
3336

3337 3338 3339
cast_context:  AS IMPLICIT_P					{ $$ = COERCION_IMPLICIT; }
		| AS ASSIGNMENT							{ $$ = COERCION_ASSIGNMENT; }
		| /*EMPTY*/								{ $$ = COERCION_EXPLICIT; }
3340 3341 3342
		;


3343
DropCastStmt: DROP CAST '(' Typename AS Typename ')' opt_drop_behavior
3344 3345 3346 3347 3348 3349 3350
				{
					DropCastStmt *n = makeNode(DropCastStmt);
					n->sourcetype = $4;
					n->targettype = $6;
					n->behavior = $8;
					$$ = (Node *)n;
				}
3351
		;
3352 3353 3354



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Hiroshi Inoue committed
3355 3356 3357 3358 3359 3360 3361 3362
/*****************************************************************************
 *
 *		QUERY:
 *
 *		REINDEX type <typename> [FORCE] [ALL]
 *
 *****************************************************************************/

3363 3364
ReindexStmt:
			REINDEX reindex_type qualified_name opt_force
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3365 3366
				{
					ReindexStmt *n = makeNode(ReindexStmt);
3367
					n->kind = $2;
3368 3369 3370 3371 3372
					n->relation = $3;
					n->name = NULL;
					n->force = $4;
					$$ = (Node *)n;
				}
3373
			| REINDEX DATABASE name opt_force
3374 3375
				{
					ReindexStmt *n = makeNode(ReindexStmt);
3376
					n->kind = OBJECT_DATABASE;
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Hiroshi Inoue committed
3377
					n->name = $3;
3378
					n->relation = NULL;
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3379 3380 3381 3382 3383
					n->force = $4;
					$$ = (Node *)n;
				}
		;

3384
reindex_type:
3385 3386
			INDEX									{ $$ = OBJECT_INDEX; }
			| TABLE									{ $$ = OBJECT_TABLE; }
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Hiroshi Inoue committed
3387
		;
3388

Hiroshi Inoue's avatar
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3389
opt_force:	FORCE									{  $$ = TRUE; }
3390
			| /* EMPTY */							{  $$ = FALSE; }
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Hiroshi Inoue committed
3391 3392 3393
		;


3394 3395
/*****************************************************************************
 *
3396
 * ALTER THING name RENAME TO newname
3397
 *
3398 3399
 *****************************************************************************/

3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467
RenameStmt: ALTER AGGREGATE func_name '(' aggr_argtype ')' RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_AGGREGATE;
					n->object = $3;
					n->objarg = makeList1($5);
					n->newname = $9;
					$$ = (Node *)n;
				}
			| ALTER CONVERSION_P any_name RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_CONVERSION;
					n->object = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER DATABASE database_name RENAME TO database_name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_DATABASE;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER FUNCTION func_name func_args RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_FUNCTION;
					n->object = $3;
					n->objarg = $4;
					n->newname = $7;
					$$ = (Node *)n;
				}
			| ALTER GROUP_P UserId RENAME TO UserId
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_GROUP;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER LANGUAGE name RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_LANGUAGE;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER OPERATOR CLASS any_name USING access_method RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_OPCLASS;
					n->object = $4;
					n->subname = $6;
					n->newname = $9;
					$$ = (Node *)n;
				}
			| ALTER SCHEMA name RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_SCHEMA;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER TABLE relation_expr RENAME opt_column opt_name TO name
3468 3469
				{
					RenameStmt *n = makeNode(RenameStmt);
3470
					n->relation = $3;
3471
					n->subname = $6;
3472
					n->newname = $8;
3473
					if ($6 == NULL)
3474
						n->renameType = OBJECT_TABLE;
3475
					else
3476
						n->renameType = OBJECT_COLUMN;
3477 3478
					$$ = (Node *)n;
				}
3479
			| ALTER TRIGGER name ON relation_expr RENAME TO name
3480 3481 3482
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->relation = $5;
3483
					n->subname = $3;
3484
					n->newname = $8;
3485 3486 3487 3488 3489 3490 3491 3492 3493
					n->renameType = OBJECT_TRIGGER;
					$$ = (Node *)n;
				}
			| ALTER USER UserId RENAME TO UserId
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_USER;
					n->subname = $3;
					n->newname = $6;
3494 3495 3496 3497
					$$ = (Node *)n;
				}
		;

3498 3499
opt_name:	name									{ $$ = $1; }
			| /*EMPTY*/								{ $$ = NULL; }
3500 3501
		;

3502 3503
opt_column: COLUMN									{ $$ = COLUMN; }
			| /*EMPTY*/								{ $$ = 0; }
3504
		;
3505 3506 3507


/*****************************************************************************
3508
 *
3509
 *		QUERY:	Define Rewrite Rule
3510
 *
3511 3512
 *****************************************************************************/

3513
RuleStmt:	CREATE opt_or_replace RULE name AS
3514 3515 3516
			{ QueryIsRule=TRUE; }
			ON event TO qualified_name where_clause
			DO opt_instead RuleActionList
3517 3518
				{
					RuleStmt *n = makeNode(RuleStmt);
3519 3520 3521 3522 3523 3524 3525
					n->replace = $2;
					n->relation = $10;
					n->rulename = $4;
					n->whereClause = $11;
					n->event = $8;
					n->instead = $13;
					n->actions = $14;
3526
					$$ = (Node *)n;
3527
					QueryIsRule=FALSE;
3528 3529 3530
				}
		;

3531 3532 3533 3534
RuleActionList:
			NOTHING									{ $$ = NIL; }
			| RuleActionStmt						{ $$ = makeList1($1); }
			| '(' RuleActionMulti ')'				{ $$ = $2; }
3535
		;
3536

3537
/* the thrashing around here is to discard "empty" statements... */
3538 3539
RuleActionMulti:
			RuleActionMulti ';' RuleActionStmtOrEmpty
3540
				{ if ($3 != (Node *) NULL)
3541
					$$ = lappend($1, $3);
3542 3543 3544
				  else
					$$ = $1;
				}
3545
			| RuleActionStmtOrEmpty
3546 3547
				{ if ($1 != (Node *) NULL)
					$$ = makeList1($1);
3548 3549 3550
				  else
					$$ = NIL;
				}
3551
		;
3552

3553 3554 3555 3556 3557 3558
RuleActionStmt:
			SelectStmt
			| InsertStmt
			| UpdateStmt
			| DeleteStmt
			| NotifyStmt
3559 3560
		;

3561 3562 3563
RuleActionStmtOrEmpty:
			RuleActionStmt							{ $$ = $1; }
			|	/*EMPTY*/							{ $$ = (Node *)NULL; }
3564 3565
		;

3566
/* change me to select, update, etc. some day */
3567 3568 3569 3570
event:		SELECT									{ $$ = CMD_SELECT; }
			| UPDATE								{ $$ = CMD_UPDATE; }
			| DELETE_P								{ $$ = CMD_DELETE; }
			| INSERT								{ $$ = CMD_INSERT; }
3571
		 ;
3572

3573 3574 3575
opt_instead:
			INSTEAD									{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
3576
		;
3577 3578


3579
DropRuleStmt:
3580
			DROP RULE name ON qualified_name opt_drop_behavior
3581 3582 3583 3584
				{
					DropPropertyStmt *n = makeNode(DropPropertyStmt);
					n->relation = $5;
					n->property = $3;
3585
					n->behavior = $6;
3586
					n->removeType = OBJECT_RULE;
3587 3588 3589 3590 3591
					$$ = (Node *) n;
				}
		;


3592 3593
/*****************************************************************************
 *
3594
 *		QUERY:
3595
 *				NOTIFY <qualified_name> can appear both in rule bodies and
3596
 *				as a query-level command
3597 3598 3599
 *
 *****************************************************************************/

3600
NotifyStmt: NOTIFY qualified_name
3601 3602
				{
					NotifyStmt *n = makeNode(NotifyStmt);
3603
					n->relation = $2;
3604 3605 3606
					$$ = (Node *)n;
				}
		;
3607

3608
ListenStmt: LISTEN qualified_name
3609 3610
				{
					ListenStmt *n = makeNode(ListenStmt);
3611
					n->relation = $2;
3612 3613
					$$ = (Node *)n;
				}
3614
		;
3615

3616 3617
UnlistenStmt:
			UNLISTEN qualified_name
3618 3619
				{
					UnlistenStmt *n = makeNode(UnlistenStmt);
3620
					n->relation = $2;
3621 3622
					$$ = (Node *)n;
				}
3623
			| UNLISTEN '*'
3624 3625
				{
					UnlistenStmt *n = makeNode(UnlistenStmt);
3626 3627 3628
					n->relation = makeNode(RangeVar);
					n->relation->relname = "*";
					n->relation->schemaname = NULL;
3629 3630
					$$ = (Node *)n;
				}
3631
		;
3632

3633 3634 3635

/*****************************************************************************
 *
3636
 *		Transactions:
3637
 *
3638 3639
 *		BEGIN / COMMIT / ROLLBACK
 *		(also older versions END / ABORT)
3640
 *
3641 3642
 *****************************************************************************/

3643
TransactionStmt:
3644
			ABORT_P opt_transaction
3645 3646
				{
					TransactionStmt *n = makeNode(TransactionStmt);
3647
					n->kind = TRANS_STMT_ROLLBACK;
3648
					n->options = NIL;
3649 3650
					$$ = (Node *)n;
				}
3651
			| BEGIN_P opt_transaction
3652 3653
				{
					TransactionStmt *n = makeNode(TransactionStmt);
3654
					n->kind = TRANS_STMT_BEGIN;
3655
					n->options = NIL;
3656 3657
					$$ = (Node *)n;
				}
3658
			| START TRANSACTION transaction_mode_list_or_empty
3659 3660
				{
					TransactionStmt *n = makeNode(TransactionStmt);
3661
					n->kind = TRANS_STMT_START;
3662
					n->options = $3;
3663 3664
					$$ = (Node *)n;
				}
3665
			| COMMIT opt_transaction
3666 3667
				{
					TransactionStmt *n = makeNode(TransactionStmt);
3668
					n->kind = TRANS_STMT_COMMIT;
3669
					n->options = NIL;
3670 3671
					$$ = (Node *)n;
				}
3672
			| END_P opt_transaction
3673 3674
				{
					TransactionStmt *n = makeNode(TransactionStmt);
3675
					n->kind = TRANS_STMT_COMMIT;
3676
					n->options = NIL;
3677 3678
					$$ = (Node *)n;
				}
3679
			| ROLLBACK opt_transaction
3680 3681
				{
					TransactionStmt *n = makeNode(TransactionStmt);
3682
					n->kind = TRANS_STMT_ROLLBACK;
3683
					n->options = NIL;
3684 3685
					$$ = (Node *)n;
				}
3686
		;
3687

3688
opt_transaction:	WORK							{}
3689 3690
			| TRANSACTION							{}
			| /*EMPTY*/								{}
3691
		;
3692

3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727
transaction_mode_list:
			ISOLATION LEVEL iso_level
					{ $$ = makeList1(makeDefElem("transaction_isolation",
												 makeStringConst($3, NULL))); }
			| transaction_access_mode
					{ $$ = makeList1(makeDefElem("transaction_read_only",
												 makeIntConst($1))); }
			| ISOLATION LEVEL iso_level transaction_access_mode
					{
						$$ = makeList2(makeDefElem("transaction_isolation",
												   makeStringConst($3, NULL)),
									   makeDefElem("transaction_read_only",
												   makeIntConst($4)));
					}
			| transaction_access_mode ISOLATION LEVEL iso_level
					{
						$$ = makeList2(makeDefElem("transaction_read_only",
												   makeIntConst($1)),
									   makeDefElem("transaction_isolation",
												   makeStringConst($4, NULL)));
					}
		;

transaction_mode_list_or_empty:
			transaction_mode_list
			| /* EMPTY */
					{ $$ = NIL; }
		;

transaction_access_mode:
			READ ONLY { $$ = TRUE; }
			| READ WRITE { $$ = FALSE; }
		;


3728 3729
/*****************************************************************************
 *
3730
 *		QUERY:
3731
 *				create view <viewname> '('target-list ')' AS <query>
3732 3733 3734
 *
 *****************************************************************************/

3735
ViewStmt:	CREATE opt_or_replace VIEW qualified_name opt_column_list
3736
				AS SelectStmt
3737 3738
				{
					ViewStmt *n = makeNode(ViewStmt);
3739 3740 3741 3742
					n->replace = $2;
					n->view = $4;
					n->aliases = $5;
					n->query = (Query *) $7;
3743 3744 3745
					$$ = (Node *)n;
				}
		;
3746 3747 3748 3749


/*****************************************************************************
 *
3750 3751
 *		QUERY:
 *				load "filename"
3752 3753 3754
 *
 *****************************************************************************/

3755
LoadStmt:	LOAD file_name
3756 3757 3758 3759 3760 3761
				{
					LoadStmt *n = makeNode(LoadStmt);
					n->filename = $2;
					$$ = (Node *)n;
				}
		;
3762 3763 3764 3765


/*****************************************************************************
 *
3766 3767
 *		CREATE DATABASE
 *
3768 3769
 *****************************************************************************/

3770 3771
CreatedbStmt:
			CREATE DATABASE database_name opt_with createdb_opt_list
3772
				{
3773
					CreatedbStmt *n = makeNode(CreatedbStmt);
3774
					n->dbname = $3;
3775
					n->options = $5;
3776 3777
					$$ = (Node *)n;
				}
3778 3779
		;

3780
createdb_opt_list:
3781 3782
			createdb_opt_list createdb_opt_item		{ $$ = lappend($1, $2); }
			| /* EMPTY */							{ $$ = NIL; }
3783 3784
		;

3785 3786
createdb_opt_item:
			LOCATION opt_equal Sconst
3787
				{
3788
					$$ = makeDefElem("location", (Node *)makeString($3));
3789
				}
3790
			| LOCATION opt_equal DEFAULT
3791
				{
3792
					$$ = makeDefElem("location", NULL);
3793
				}
3794
			| TEMPLATE opt_equal name
3795
				{
3796
					$$ = makeDefElem("template", (Node *)makeString($3));
3797
				}
3798
			| TEMPLATE opt_equal DEFAULT
3799
				{
3800
					$$ = makeDefElem("template", NULL);
3801
				}
3802
			| ENCODING opt_equal Sconst
3803
				{
3804
					$$ = makeDefElem("encoding", (Node *)makeString($3));
3805
				}
3806
			| ENCODING opt_equal Iconst
3807
				{
3808
					$$ = makeDefElem("encoding", (Node *)makeInteger($3));
3809
				}
3810
			| ENCODING opt_equal DEFAULT
3811
				{
3812
					$$ = makeDefElem("encoding", NULL);
3813
				}
3814
			| OWNER opt_equal name
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3815
				{
3816
					$$ = makeDefElem("owner", (Node *)makeString($3));
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3817
				}
3818
			| OWNER opt_equal DEFAULT
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3819
				{
3820
					$$ = makeDefElem("owner", NULL);
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3821
				}
3822 3823
		;

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3824 3825
/*
 *	Though the equals sign doesn't match other WITH options, pg_dump uses
3826 3827
 *	equals for backward compability, and it doesn't seem worth removing it.
 *	2002-02-25
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3828
 */
3829 3830
opt_equal:	'='										{}
			| /*EMPTY*/								{}
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3831 3832
		;

3833

3834 3835 3836 3837 3838 3839
/*****************************************************************************
 *
 *		ALTER DATABASE
 *
 *****************************************************************************/

3840 3841
AlterDatabaseSetStmt:
			ALTER DATABASE database_name SET set_rest
3842 3843 3844
				{
					AlterDatabaseSetStmt *n = makeNode(AlterDatabaseSetStmt);
					n->dbname = $3;
3845 3846
					n->variable = $5->name;
					n->value = $5->args;
3847 3848
					$$ = (Node *)n;
				}
3849
			| ALTER DATABASE database_name VariableResetStmt
3850 3851 3852 3853
				{
					AlterDatabaseSetStmt *n = makeNode(AlterDatabaseSetStmt);
					n->dbname = $3;
					n->variable = ((VariableResetStmt *)$4)->name;
3854
					n->value = NIL;
3855 3856 3857 3858
					$$ = (Node *)n;
				}
		;

3859

3860 3861
/*****************************************************************************
 *
3862 3863
 *		DROP DATABASE
 *
3864
 * This is implicitly CASCADE, no need for drop behavior
3865 3866
 *****************************************************************************/

3867
DropdbStmt: DROP DATABASE database_name
3868 3869 3870 3871 3872 3873 3874 3875 3876
				{
					DropdbStmt *n = makeNode(DropdbStmt);
					n->dbname = $3;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
3877
 *
3878
 * Manipulate a domain
3879 3880 3881
 *
 *****************************************************************************/

3882
CreateDomainStmt:
3883
			CREATE DOMAIN_P any_name opt_as Typename ColQualList
3884
				{
3885 3886 3887 3888
					CreateDomainStmt *n = makeNode(CreateDomainStmt);
					n->domainname = $3;
					n->typename = $5;
					n->constraints = $6;
3889 3890 3891
					$$ = (Node *)n;
				}
		;
3892

3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937
AlterDomainStmt:
			/* ALTER DOMAIN <domain> {SET DEFAULT <expr>|DROP DEFAULT} */
			ALTER DOMAIN_P any_name alter_column_default
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'T';
					n->typename = $3;
					n->def = $4;
					$$ = (Node *)n;
				}
			/* ALTER DOMAIN <domain> DROP NOT NULL */
			| ALTER DOMAIN_P any_name DROP NOT NULL_P
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'N';
					n->typename = $3;
					$$ = (Node *)n;
				}
			/* ALTER DOMAIN <domain> SET NOT NULL */
			| ALTER DOMAIN_P any_name SET NOT NULL_P
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'O';
					n->typename = $3;
					$$ = (Node *)n;
				}
			/* ALTER DOMAIN <domain> ADD CONSTRAINT ... */
			| ALTER DOMAIN_P any_name ADD TableConstraint
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'C';
					n->typename = $3;
					n->def = $5;
					$$ = (Node *)n;
				}
			/* ALTER DOMAIN <domain> DROP CONSTRAINT <name> [RESTRICT|CASCADE] */
			| ALTER DOMAIN_P any_name DROP CONSTRAINT name opt_drop_behavior
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'X';
					n->typename = $3;
					n->name = $6;
					n->behavior = $7;
					$$ = (Node *)n;
				}
3938 3939 3940 3941 3942 3943 3944 3945 3946
			/* ALTER DOMAIN <domain> OWNER TO UserId */
			| ALTER DOMAIN_P any_name OWNER TO UserId
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'U';
					n->typename = $3;
					n->name = $6;
					$$ = (Node *)n;
				}
3947 3948
			;

3949 3950
opt_as:		AS										{}
			| /* EMPTY */							{}
3951
		;
3952

3953

3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976
/*****************************************************************************
 *
 * Manipulate a conversion
 *
 *		CREATE [DEFAULT] CONVERSION <conversion_name>
 *		FOR <encoding_name> TO <encoding_name> FROM <func_name>
 *
 *****************************************************************************/

CreateConversionStmt:
			CREATE opt_default CONVERSION_P any_name FOR Sconst
			TO Sconst FROM any_name
			{
			  CreateConversionStmt *n = makeNode(CreateConversionStmt);
			  n->conversion_name = $4;
			  n->for_encoding_name = $6;
			  n->to_encoding_name = $8;
			  n->func_name = $10;
			  n->def = $2;
			  $$ = (Node *)n;
			}
		;

3977 3978
/*****************************************************************************
 *
3979
 *		QUERY:
3980
 *				cluster <index_name> on <qualified_name>
3981
 *				cluster <qualified_name>
3982
 *				cluster
3983 3984 3985
 *
 *****************************************************************************/

3986 3987
ClusterStmt:
			CLUSTER index_name ON qualified_name
3988 3989
				{
				   ClusterStmt *n = makeNode(ClusterStmt);
3990
				   n->relation = $4;
3991 3992 3993
				   n->indexname = $2;
				   $$ = (Node*)n;
				}
3994 3995 3996 3997 3998 3999 4000
			| CLUSTER qualified_name
				{
			       ClusterStmt *n = makeNode(ClusterStmt);
				   n->relation = $2;
				   n->indexname = NULL;
				   $$ = (Node*)n;
				}
4001
			| CLUSTER
4002 4003 4004 4005 4006 4007
			    {
				   ClusterStmt *n = makeNode(ClusterStmt);
				   n->relation = NULL;
				   n->indexname = NULL;
				   $$ = (Node*)n;
				}
4008
		;
4009 4010 4011

/*****************************************************************************
 *
4012 4013
 *		QUERY:
 *				vacuum
4014
 *				analyze
4015 4016 4017
 *
 *****************************************************************************/

4018
VacuumStmt: VACUUM opt_full opt_freeze opt_verbose
4019 4020
				{
					VacuumStmt *n = makeNode(VacuumStmt);
4021 4022
					n->vacuum = true;
					n->analyze = false;
4023
					n->full = $2;
4024 4025
					n->freeze = $3;
					n->verbose = $4;
4026
					n->relation = NULL;
4027
					n->va_cols = NIL;
4028 4029
					$$ = (Node *)n;
				}
4030
			| VACUUM opt_full opt_freeze opt_verbose qualified_name
4031 4032
				{
					VacuumStmt *n = makeNode(VacuumStmt);
4033 4034
					n->vacuum = true;
					n->analyze = false;
4035
					n->full = $2;
4036 4037
					n->freeze = $3;
					n->verbose = $4;
4038
					n->relation = $5;
4039 4040 4041
					n->va_cols = NIL;
					$$ = (Node *)n;
				}
4042
			| VACUUM opt_full opt_freeze opt_verbose AnalyzeStmt
4043
				{
4044
					VacuumStmt *n = (VacuumStmt *) $5;
4045
					n->vacuum = true;
4046
					n->full = $2;
4047 4048
					n->freeze = $3;
					n->verbose |= $4;
4049 4050 4051 4052
					$$ = (Node *)n;
				}
		;

4053 4054
AnalyzeStmt:
			analyze_keyword opt_verbose
4055 4056 4057 4058
				{
					VacuumStmt *n = makeNode(VacuumStmt);
					n->vacuum = false;
					n->analyze = true;
4059
					n->full = false;
4060
					n->freeze = false;
4061
					n->verbose = $2;
4062
					n->relation = NULL;
4063 4064 4065
					n->va_cols = NIL;
					$$ = (Node *)n;
				}
4066
			| analyze_keyword opt_verbose qualified_name opt_name_list
4067 4068 4069 4070
				{
					VacuumStmt *n = makeNode(VacuumStmt);
					n->vacuum = false;
					n->analyze = true;
4071
					n->full = false;
4072
					n->freeze = false;
4073
					n->verbose = $2;
4074
					n->relation = $3;
4075 4076 4077
					n->va_cols = $4;
					$$ = (Node *)n;
				}
4078 4079
		;

4080
analyze_keyword:
4081 4082
			ANALYZE									{}
			| ANALYSE /* British */					{}
4083
		;
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4084

4085 4086 4087
opt_verbose:
			VERBOSE									{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
4088
		;
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4090 4091
opt_full:	FULL									{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
4092 4093
		;

4094 4095
opt_freeze: FREEZE									{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
4096 4097
		;

4098 4099 4100
opt_name_list:
			'(' name_list ')'						{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
4101
		;
4102

4103

4104 4105
/*****************************************************************************
 *
4106
 *		QUERY:
4107
 *				EXPLAIN [ANALYZE] [VERBOSE] query
4108 4109 4110
 *
 *****************************************************************************/

4111
ExplainStmt: EXPLAIN opt_analyze opt_verbose ExplainableStmt
4112 4113
				{
					ExplainStmt *n = makeNode(ExplainStmt);
4114
					n->analyze = $2;
4115 4116 4117 4118
					n->verbose = $3;
					n->query = (Query*)$4;
					$$ = (Node *)n;
				}
4119
		;
4120

4121 4122 4123 4124 4125 4126 4127 4128 4129
ExplainableStmt:
			SelectStmt
			| InsertStmt
			| UpdateStmt
			| DeleteStmt
			| DeclareCursorStmt
			| ExecuteStmt					/* by default all are $$=$1 */
		;

4130 4131 4132 4133 4134
opt_analyze:
			analyze_keyword			{ $$ = TRUE; }
			| /* EMPTY */			{ $$ = FALSE; }
		;

4135 4136 4137 4138 4139 4140 4141
/*****************************************************************************
 *
 *		QUERY:
 *				PREPARE <plan_name> [(args, ...)] AS <query>
 *
 *****************************************************************************/

4142
PrepareStmt: PREPARE name prep_type_clause AS PreparableStmt
4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160
				{
					PrepareStmt *n = makeNode(PrepareStmt);
					n->name = $2;
					n->argtypes = $3;
					n->query = (Query *) $5;
					$$ = (Node *) n;
				}
		;

prep_type_clause: '(' prep_type_list ')'	{ $$ = $2; }
				| /* EMPTY */				{ $$ = NIL; }
		;

prep_type_list: Typename			{ $$ = makeList1($1); }
			  | prep_type_list ',' Typename
									{ $$ = lappend($1, $3); }
		;

4161 4162 4163 4164 4165 4166 4167
PreparableStmt:
			SelectStmt
			| InsertStmt
			| UpdateStmt
			| DeleteStmt					/* by default all are $$=$1 */
		;

4168 4169
/*****************************************************************************
 *
4170 4171
 * EXECUTE <plan_name> [(params, ...)]
 * CREATE TABLE <name> AS EXECUTE <plan_name> [(params, ...)]
4172 4173 4174
 *
 *****************************************************************************/

4175
ExecuteStmt: EXECUTE name execute_param_clause
4176 4177 4178 4179
				{
					ExecuteStmt *n = makeNode(ExecuteStmt);
					n->name = $2;
					n->params = $3;
4180 4181 4182 4183 4184 4185 4186 4187 4188
					n->into = NULL;
					$$ = (Node *) n;
				}
			| CREATE OptTemp TABLE qualified_name OptCreateAs AS EXECUTE name execute_param_clause
				{
					ExecuteStmt *n = makeNode(ExecuteStmt);
					n->name = $8;
					n->params = $9;
					$4->istemp = $2;
4189
					n->into = $4;
4190
					if ($5)
4191 4192 4193
						ereport(ERROR,
								(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
								 errmsg("column name list not allowed in CREATE TABLE / AS EXECUTE")));
4194
					/* ... because it's not implemented, but it could be */
4195 4196 4197 4198
					$$ = (Node *) n;
				}
		;

4199
execute_param_clause: '(' expr_list ')'				{ $$ = $2; }
4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222
					| /* EMPTY */					{ $$ = NIL; }
					;

/*****************************************************************************
 *
 *		QUERY:
 *				DEALLOCATE [PREPARE] <plan_name>
 *
 *****************************************************************************/

DeallocateStmt: DEALLOCATE name
					{
						DeallocateStmt *n = makeNode(DeallocateStmt);
						n->name = $2;
						$$ = (Node *) n;
					}
				| DEALLOCATE PREPARE name
					{
						DeallocateStmt *n = makeNode(DeallocateStmt);
						n->name = $3;
						$$ = (Node *) n;
					}
		;
4223

4224 4225
/*****************************************************************************
 *
4226 4227
 *		QUERY:
 *				INSERT STATEMENTS
4228
 *
4229 4230
 *****************************************************************************/

4231 4232
InsertStmt:
			INSERT INTO qualified_name insert_rest
4233
				{
4234
					$4->relation = $3;
4235
					$$ = (Node *) $4;
4236 4237
				}
		;
4238

4239 4240
insert_rest:
			VALUES '(' insert_target_list ')'
4241
				{
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4242
					$$ = makeNode(InsertStmt);
4243
					$$->cols = NIL;
4244
					$$->targetList = $3;
4245
					$$->selectStmt = NULL;
4246
				}
4247
			| DEFAULT VALUES
4248 4249
				{
					$$ = makeNode(InsertStmt);
4250
					$$->cols = NIL;
4251
					$$->targetList = NIL;
4252 4253
					$$->selectStmt = NULL;
				}
4254
			| SelectStmt
4255
				{
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4256
					$$ = makeNode(InsertStmt);
4257
					$$->cols = NIL;
4258 4259
					$$->targetList = NIL;
					$$->selectStmt = $1;
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				}
4261
			| '(' insert_column_list ')' VALUES '(' insert_target_list ')'
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4262 4263 4264 4265
				{
					$$ = makeNode(InsertStmt);
					$$->cols = $2;
					$$->targetList = $6;
4266
					$$->selectStmt = NULL;
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4267
				}
4268
			| '(' insert_column_list ')' SelectStmt
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4269 4270 4271
				{
					$$ = makeNode(InsertStmt);
					$$->cols = $2;
4272 4273
					$$->targetList = NIL;
					$$->selectStmt = $4;
4274 4275 4276
				}
		;

4277
insert_column_list:
4278
			insert_column_item						{ $$ = makeList1($1); }
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4279 4280
			| insert_column_list ',' insert_column_item
					{ $$ = lappend($1, $3); }
4281
		;
4282

4283 4284
insert_column_item:
			ColId opt_indirection
4285
				{
4286 4287 4288 4289 4290
					ResTarget *n = makeNode(ResTarget);
					n->name = $1;
					n->indirection = $2;
					n->val = NULL;
					$$ = (Node *)n;
4291 4292
				}
		;
4293

4294

4295 4296
/*****************************************************************************
 *
4297 4298
 *		QUERY:
 *				DELETE STATEMENTS
4299 4300
 *
 *****************************************************************************/
4301

4302
DeleteStmt: DELETE_P FROM relation_expr where_clause
4303 4304
				{
					DeleteStmt *n = makeNode(DeleteStmt);
4305
					n->relation = $3;
4306
					n->whereClause = $4;
4307 4308 4309
					$$ = (Node *)n;
				}
		;
4310

4311
LockStmt:	LOCK_P opt_table qualified_name_list opt_lock
4312
				{
4313 4314
					LockStmt *n = makeNode(LockStmt);

4315
					n->relations = $3;
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4316
					n->mode = $4;
4317 4318
					$$ = (Node *)n;
				}
4319
		;
4320

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4321 4322
opt_lock:	IN_P lock_type MODE 			{ $$ = $2; }
			| /*EMPTY*/						{ $$ = AccessExclusiveLock; }
4323
		;
4324

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4325 4326 4327 4328 4329 4330 4331 4332
lock_type:	ACCESS SHARE					{ $$ = AccessShareLock; }
			| ROW SHARE						{ $$ = RowShareLock; }
			| ROW EXCLUSIVE					{ $$ = RowExclusiveLock; }
			| SHARE UPDATE EXCLUSIVE		{ $$ = ShareUpdateExclusiveLock; }
			| SHARE							{ $$ = ShareLock; }
			| SHARE ROW EXCLUSIVE			{ $$ = ShareRowExclusiveLock; }
			| EXCLUSIVE						{ $$ = ExclusiveLock; }
			| ACCESS EXCLUSIVE				{ $$ = AccessExclusiveLock; }
4333
		;
4334

4335

4336 4337
/*****************************************************************************
 *
4338
 *		QUERY:
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4339
 *				UpdateStmt (UPDATE)
4340 4341 4342
 *
 *****************************************************************************/

4343 4344 4345 4346
UpdateStmt: UPDATE relation_expr
			SET update_target_list
			from_clause
			where_clause
4347
				{
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4348
					UpdateStmt *n = makeNode(UpdateStmt);
4349
					n->relation = $2;
4350 4351 4352
					n->targetList = $4;
					n->fromClause = $5;
					n->whereClause = $6;
4353 4354 4355
					$$ = (Node *)n;
				}
		;
4356

4357 4358 4359

/*****************************************************************************
 *
4360 4361
 *		QUERY:
 *				CURSOR STATEMENTS
4362 4363
 *
 *****************************************************************************/
4364
DeclareCursorStmt: DECLARE name cursor_options CURSOR opt_hold FOR SelectStmt
4365
				{
4366
					DeclareCursorStmt *n = makeNode(DeclareCursorStmt);
4367
					n->portalname = $2;
4368
					n->options = $3;
4369 4370 4371
					n->query = $7;
					if ($5)
						n->options |= CURSOR_OPT_HOLD;
4372
					$$ = (Node *)n;
4373 4374
				}
		;
4375

4376
cursor_options: /*EMPTY*/					{ $$ = 0; }
4377
			| cursor_options NO SCROLL		{ $$ = $1 | CURSOR_OPT_NO_SCROLL; }
4378
			| cursor_options SCROLL			{ $$ = $1 | CURSOR_OPT_SCROLL; }
4379
			| cursor_options BINARY			{ $$ = $1 | CURSOR_OPT_BINARY; }
4380
			| cursor_options INSENSITIVE	{ $$ = $1 | CURSOR_OPT_INSENSITIVE; }
4381 4382
		;

4383 4384 4385
opt_hold: /* EMPTY */						{ $$ = FALSE; }
			| WITH HOLD						{ $$ = TRUE; }
			| WITHOUT HOLD					{ $$ = FALSE; }
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4386
		;
4387

4388 4389
/*****************************************************************************
 *
4390 4391
 *		QUERY:
 *				SELECT STATEMENTS
4392 4393
 *
 *****************************************************************************/
4394

4395 4396 4397 4398 4399
/* A complete SELECT statement looks like this.
 *
 * The rule returns either a single SelectStmt node or a tree of them,
 * representing a set-operation tree.
 *
4400 4401 4402 4403 4404 4405 4406
 * There is an ambiguity when a sub-SELECT is within an a_expr and there
 * are excess parentheses: do the parentheses belong to the sub-SELECT or
 * to the surrounding a_expr?  We don't really care, but yacc wants to know.
 * To resolve the ambiguity, we are careful to define the grammar so that
 * the decision is staved off as long as possible: as long as we can keep
 * absorbing parentheses into the sub-SELECT, we will do so, and only when
 * it's no longer possible to do that will we decide that parens belong to
4407
 * the expression.	For example, in "SELECT (((SELECT 2)) + 3)" the extra
4408
 * parentheses are treated as part of the sub-select.  The necessity of doing
4409
 * it that way is shown by "SELECT (((SELECT 2)) UNION SELECT 2)".	Had we
4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430
 * parsed "((SELECT 2))" as an a_expr, it'd be too late to go back to the
 * SELECT viewpoint when we see the UNION.
 *
 * This approach is implemented by defining a nonterminal select_with_parens,
 * which represents a SELECT with at least one outer layer of parentheses,
 * and being careful to use select_with_parens, never '(' SelectStmt ')',
 * in the expression grammar.  We will then have shift-reduce conflicts
 * which we can resolve in favor of always treating '(' <select> ')' as
 * a select_with_parens.  To resolve the conflicts, the productions that
 * conflict with the select_with_parens productions are manually given
 * precedences lower than the precedence of ')', thereby ensuring that we
 * shift ')' (and then reduce to select_with_parens) rather than trying to
 * reduce the inner <select> nonterminal to something else.  We use UMINUS
 * precedence for this, which is a fairly arbitrary choice.
 *
 * To be able to define select_with_parens itself without ambiguity, we need
 * a nonterminal select_no_parens that represents a SELECT structure with no
 * outermost parentheses.  This is a little bit tedious, but it works.
 *
 * In non-expression contexts, we use SelectStmt which can represent a SELECT
 * with or without outer parentheses.
4431 4432
 */

4433
SelectStmt: select_no_parens			%prec UMINUS
4434
			| select_with_parens		%prec UMINUS
4435 4436
		;

4437 4438 4439
select_with_parens:
			'(' select_no_parens ')'				{ $$ = $2; }
			| '(' select_with_parens ')'			{ $$ = $2; }
4440
		;
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4441

4442 4443 4444 4445 4446 4447
/*
 *	FOR UPDATE may be before or after LIMIT/OFFSET.
 *	In <=7.2.X, LIMIT/OFFSET had to be after FOR UPDATE
 *	We now support both orderings, but prefer LIMIT/OFFSET before FOR UPDATE
 *	2002-08-28 bjm
 */
4448 4449
select_no_parens:
			simple_select						{ $$ = $1; }
4450
			| select_clause sort_clause
4451
				{
4452 4453
					insertSelectOptions((SelectStmt *) $1, $2, NIL,
										NULL, NULL);
4454 4455
					$$ = $1;
				}
4456
			| select_clause opt_sort_clause for_update_clause opt_select_limit
4457
				{
4458 4459
					insertSelectOptions((SelectStmt *) $1, $2, $3,
										nth(0, $4), nth(1, $4));
4460 4461
					$$ = $1;
				}
4462
			| select_clause opt_sort_clause select_limit opt_for_update_clause
4463
				{
4464 4465
					insertSelectOptions((SelectStmt *) $1, $2, $4,
										nth(0, $3), nth(1, $3));
4466 4467
					$$ = $1;
				}
4468
		;
4469

4470 4471 4472
select_clause:
			simple_select							{ $$ = $1; }
			| select_with_parens					{ $$ = $1; }
4473
		;
4474

4475 4476 4477
/*
 * This rule parses SELECT statements that can appear within set operations,
 * including UNION, INTERSECT and EXCEPT.  '(' and ')' can be used to specify
4478
 * the ordering of the set operations.	Without '(' and ')' we want the
4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489
 * operations to be ordered per the precedence specs at the head of this file.
 *
 * As with select_no_parens, simple_select cannot have outer parentheses,
 * but can have parenthesized subclauses.
 *
 * Note that sort clauses cannot be included at this level --- SQL92 requires
 *		SELECT foo UNION SELECT bar ORDER BY baz
 * to be parsed as
 *		(SELECT foo UNION SELECT bar) ORDER BY baz
 * not
 *		SELECT foo UNION (SELECT bar ORDER BY baz)
4490 4491 4492 4493
 * Likewise FOR UPDATE and LIMIT.  Therefore, those clauses are described
 * as part of the select_no_parens production, not simple_select.
 * This does not limit functionality, because you can reintroduce sort and
 * limit clauses inside parentheses.
4494 4495 4496 4497
 *
 * NOTE: only the leftmost component SelectStmt should have INTO.
 * However, this is not checked by the grammar; parse analysis must check it.
 */
4498 4499 4500 4501
simple_select:
			SELECT opt_distinct target_list
			into_clause from_clause where_clause
			group_clause having_clause
4502
				{
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4503
					SelectStmt *n = makeNode(SelectStmt);
4504
					n->distinctClause = $2;
4505
					n->targetList = $3;
4506
					n->into = $4;
4507
					n->intoColNames = NIL;
4508 4509 4510 4511 4512 4513
					n->fromClause = $5;
					n->whereClause = $6;
					n->groupClause = $7;
					n->havingClause = $8;
					$$ = (Node *)n;
				}
4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525
			| select_clause UNION opt_all select_clause
				{
					$$ = makeSetOp(SETOP_UNION, $3, $1, $4);
				}
			| select_clause INTERSECT opt_all select_clause
				{
					$$ = makeSetOp(SETOP_INTERSECT, $3, $1, $4);
				}
			| select_clause EXCEPT opt_all select_clause
				{
					$$ = makeSetOp(SETOP_EXCEPT, $3, $1, $4);
				}
4526
		;
4527

4528 4529 4530
into_clause:
			INTO OptTempTableName					{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NULL; }
4531 4532 4533 4534 4535 4536
		;

/*
 * Redundancy here is needed to avoid shift/reduce conflicts,
 * since TEMP is not a reserved word.  See also OptTemp.
 */
4537 4538
OptTempTableName:
			TEMPORARY opt_table qualified_name
4539
				{
4540 4541 4542 4543
					$$ = $3;
					$$->istemp = true;
				}
			| TEMP opt_table qualified_name
4544
				{
4545 4546 4547 4548
					$$ = $3;
					$$->istemp = true;
				}
			| LOCAL TEMPORARY opt_table qualified_name
4549
				{
4550 4551 4552 4553
					$$ = $4;
					$$->istemp = true;
				}
			| LOCAL TEMP opt_table qualified_name
4554
				{
4555 4556 4557 4558
					$$ = $4;
					$$->istemp = true;
				}
			| GLOBAL TEMPORARY opt_table qualified_name
4559
				{
4560 4561
					$$ = $4;
					$$->istemp = true;
4562
				}
4563
			| GLOBAL TEMP opt_table qualified_name
4564
				{
4565 4566 4567 4568
					$$ = $4;
					$$->istemp = true;
				}
			| TABLE qualified_name
4569
				{
4570 4571 4572 4573
					$$ = $2;
					$$->istemp = false;
				}
			| qualified_name
4574
				{
4575 4576
					$$ = $1;
					$$->istemp = false;
4577
				}
4578 4579
		;

4580 4581
opt_table:	TABLE									{}
			| /*EMPTY*/								{}
4582
		;
4583

4584
opt_all:	ALL										{ $$ = TRUE; }
4585
			| DISTINCT								{ $$ = FALSE; }
4586
			| /*EMPTY*/								{ $$ = FALSE; }
4587 4588
		;

4589 4590 4591
/* We use (NIL) as a placeholder to indicate that all target expressions
 * should be placed in the DISTINCT list during parsetree analysis.
 */
4592 4593 4594 4595 4596
opt_distinct:
			DISTINCT								{ $$ = makeList1(NIL); }
			| DISTINCT ON '(' expr_list ')'			{ $$ = $4; }
			| ALL									{ $$ = NIL; }
			| /*EMPTY*/								{ $$ = NIL; }
4597
		;
4598

4599 4600 4601 4602 4603
opt_sort_clause:
			sort_clause								{ $$ = $1;}
			| /*EMPTY*/								{ $$ = NIL; }
		;

4604 4605
sort_clause:
			ORDER BY sortby_list					{ $$ = $3; }
4606
		;
4607

4608 4609 4610
sortby_list:
			sortby									{ $$ = makeList1($1); }
			| sortby_list ',' sortby				{ $$ = lappend($1, $3); }
4611
		;
4612

4613
sortby:		a_expr USING qual_all_Op
4614
				{
4615
					$$ = makeNode(SortBy);
4616
					$$->node = $1;
4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639
					$$->sortby_kind = SORTBY_USING;
					$$->useOp = $3;
				}
			| a_expr ASC
				{
					$$ = makeNode(SortBy);
					$$->node = $1;
					$$->sortby_kind = SORTBY_ASC;
					$$->useOp = NIL;
				}
			| a_expr DESC
				{
					$$ = makeNode(SortBy);
					$$->node = $1;
					$$->sortby_kind = SORTBY_DESC;
					$$->useOp = NIL;
				}
			| a_expr
				{
					$$ = makeNode(SortBy);
					$$->node = $1;
					$$->sortby_kind = SORTBY_ASC;	/* default */
					$$->useOp = NIL;
4640 4641
				}
		;
4642

4643

4644 4645 4646 4647 4648 4649 4650 4651 4652 4653
select_limit:
			LIMIT select_limit_value OFFSET select_offset_value
				{ $$ = makeList2($4, $2); }
			| OFFSET select_offset_value LIMIT select_limit_value
				{ $$ = makeList2($2, $4); }
			| LIMIT select_limit_value
				{ $$ = makeList2(NULL, $2); }
			| OFFSET select_offset_value
				{ $$ = makeList2($2, NULL); }
			| LIMIT select_limit_value ',' select_offset_value
4654 4655
				{
					/* Disabled because it was too confusing, bjm 2002-02-18 */
4656
					ereport(ERROR,
4657
							(errcode(ERRCODE_SYNTAX_ERROR),
4658 4659
							 errmsg("LIMIT #,# syntax is not supported"),
							 errhint("Use separate LIMIT and OFFSET clauses.")));
4660
				}
4661 4662
		;

4663 4664
opt_select_limit:
			select_limit							{ $$ = $1; }
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4665 4666
			| /* EMPTY */
					{ $$ = makeList2(NULL,NULL); }
4667 4668
		;

4669
select_limit_value:
4670
			a_expr									{ $$ = $1; }
4671 4672 4673
			| ALL
				{
					/* LIMIT ALL is represented as a NULL constant */
4674 4675
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Null;
4676 4677
					$$ = (Node *)n;
				}
4678 4679
		;

4680
select_offset_value:
4681
			a_expr									{ $$ = $1; }
4682
		;
4683

4684
/*
4685 4686
 *	jimmy bell-style recursive queries aren't supported in the
 *	current system.
4687
 *
4688 4689
 *	...however, recursive addattr and rename supported.  make special
 *	cases for these.
4690 4691
 */

4692 4693 4694
group_clause:
			GROUP_P BY expr_list					{ $$ = $3; }
			| /*EMPTY*/								{ $$ = NIL; }
4695
		;
4696

4697 4698 4699
having_clause:
			HAVING a_expr							{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NULL; }
4700
		;
4701

4702 4703 4704
for_update_clause:
			FOR UPDATE update_list					{ $$ = $3; }
			| FOR READ ONLY							{ $$ = NULL; }
4705 4706
		;

4707 4708 4709
opt_for_update_clause:
			for_update_clause						{ $$ = $1; }
			| /* EMPTY */							{ $$ = NULL; }
4710 4711
		;

4712 4713 4714
update_list:
			OF name_list							{ $$ = $2; }
			| /* EMPTY */							{ $$ = makeList1(NULL); }
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4715
		;
4716

4717
/*****************************************************************************
4718
 *
4719
 *	clauses common to all Optimizable Stmts:
4720 4721
 *		from_clause		- allow list of both JOIN expressions and table names
 *		where_clause	- qualifications for joins or restrictions
4722
 *
4723 4724
 *****************************************************************************/

4725 4726 4727
from_clause:
			FROM from_list							{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
4728 4729
		;

4730 4731 4732
from_list:
			table_ref								{ $$ = makeList1($1); }
			| from_list ',' table_ref				{ $$ = lappend($1, $3); }
4733 4734
		;

4735
/*
4736
 * table_ref is where an alias clause can be attached.	Note we cannot make
4737 4738 4739 4740 4741
 * alias_clause have an empty production because that causes parse conflicts
 * between table_ref := '(' joined_table ')' alias_clause
 * and joined_table := '(' joined_table ')'.  So, we must have the
 * redundant-looking productions here instead.
 */
4742
table_ref:	relation_expr
4743
				{
4744
					$$ = (Node *) $1;
4745
				}
4746
			| relation_expr alias_clause
4747
				{
4748
					$1->alias = $2;
4749
					$$ = (Node *) $1;
4750
				}
4751
			| func_table
4752 4753 4754
				{
					RangeFunction *n = makeNode(RangeFunction);
					n->funccallnode = $1;
4755 4756 4757
					n->coldeflist = NIL;
					$$ = (Node *) n;
				}
4758 4759 4760 4761 4762 4763 4764 4765 4766
			| func_table alias_clause
				{
					RangeFunction *n = makeNode(RangeFunction);
					n->funccallnode = $1;
					n->alias = $2;
					n->coldeflist = NIL;
					$$ = (Node *) n;
				}
			| func_table AS '(' TableFuncElementList ')'
4767 4768 4769 4770 4771 4772
				{
					RangeFunction *n = makeNode(RangeFunction);
					n->funccallnode = $1;
					n->coldeflist = $4;
					$$ = (Node *) n;
				}
4773
			| func_table AS ColId '(' TableFuncElementList ')'
4774 4775 4776 4777 4778 4779 4780 4781 4782
				{
					RangeFunction *n = makeNode(RangeFunction);
					Alias *a = makeNode(Alias);
					n->funccallnode = $1;
					a->aliasname = $3;
					n->alias = a;
					n->coldeflist = $5;
					$$ = (Node *) n;
				}
4783
			| func_table ColId '(' TableFuncElementList ')'
4784 4785 4786 4787 4788 4789 4790
				{
					RangeFunction *n = makeNode(RangeFunction);
					Alias *a = makeNode(Alias);
					n->funccallnode = $1;
					a->aliasname = $2;
					n->alias = a;
					n->coldeflist = $4;
4791 4792
					$$ = (Node *) n;
				}
4793
			| select_with_parens
4794 4795 4796 4797 4798 4799 4800 4801 4802 4803
				{
					/*
					 * The SQL spec does not permit a subselect
					 * (<derived_table>) without an alias clause,
					 * so we don't either.  This avoids the problem
					 * of needing to invent a unique refname for it.
					 * That could be surmounted if there's sufficient
					 * popular demand, but for now let's just implement
					 * the spec and see if anyone complains.
					 * However, it does seem like a good idea to emit
4804
					 * an error message that's better than "syntax error".
4805
					 */
4806 4807
					ereport(ERROR,
							(errcode(ERRCODE_SYNTAX_ERROR),
4808
							 errmsg("subquery in FROM must have an alias"),
4809
							 errhint("For example, FROM (SELECT ...) [AS] foo.")));
4810 4811
					$$ = NULL;
				}
4812
			| select_with_parens alias_clause
4813
				{
4814
					RangeSubselect *n = makeNode(RangeSubselect);
4815
					n->subquery = $1;
4816
					n->alias = $2;
4817
					$$ = (Node *) n;
4818
				}
4819
			| joined_table
4820
				{
4821
					$$ = (Node *) $1;
4822
				}
4823
			| '(' joined_table ')' alias_clause
4824
				{
4825 4826
					$2->alias = $4;
					$$ = (Node *) $2;
4827 4828 4829
				}
		;

4830

4831 4832 4833 4834 4835 4836 4837 4838 4839
/*
 * It may seem silly to separate joined_table from table_ref, but there is
 * method in SQL92's madness: if you don't do it this way you get reduce-
 * reduce conflicts, because it's not clear to the parser generator whether
 * to expect alias_clause after ')' or not.  For the same reason we must
 * treat 'JOIN' and 'join_type JOIN' separately, rather than allowing
 * join_type to expand to empty; if we try it, the parser generator can't
 * figure out when to reduce an empty join_type right after table_ref.
 *
4840
 * Note that a CROSS JOIN is the same as an unqualified
4841 4842
 * INNER JOIN, and an INNER JOIN/ON has the same shape
 * but a qualification expression to limit membership.
4843
 * A NATURAL JOIN implicitly matches column names between
4844 4845
 * tables and the shape is determined by which columns are
 * in common. We'll collect columns during the later transformations.
4846
 */
4847

4848 4849
joined_table:
			'(' joined_table ')'
4850 4851 4852
				{
					$$ = $2;
				}
4853
			| table_ref CROSS JOIN table_ref
4854
				{
4855
					/* CROSS JOIN is same as unqualified inner join */
4856
					JoinExpr *n = makeNode(JoinExpr);
4857 4858 4859 4860 4861 4862
					n->jointype = JOIN_INNER;
					n->isNatural = FALSE;
					n->larg = $1;
					n->rarg = $4;
					n->using = NIL;
					n->quals = NULL;
4863
					$$ = n;
4864
				}
4865
			| table_ref UNIONJOIN table_ref
4866
				{
4867 4868 4869
					/* UNION JOIN is made into 1 token to avoid shift/reduce
					 * conflict against regular UNION keyword.
					 */
4870
					JoinExpr *n = makeNode(JoinExpr);
4871 4872 4873 4874 4875 4876
					n->jointype = JOIN_UNION;
					n->isNatural = FALSE;
					n->larg = $1;
					n->rarg = $3;
					n->using = NIL;
					n->quals = NULL;
4877
					$$ = n;
4878
				}
4879
			| table_ref join_type JOIN table_ref join_qual
4880
				{
4881
					JoinExpr *n = makeNode(JoinExpr);
4882
					n->jointype = $2;
4883
					n->isNatural = FALSE;
4884 4885 4886
					n->larg = $1;
					n->rarg = $4;
					if ($5 != NULL && IsA($5, List))
4887
						n->using = (List *) $5; /* USING clause */
4888 4889
					else
						n->quals = $5; /* ON clause */
4890
					$$ = n;
4891
				}
4892
			| table_ref JOIN table_ref join_qual
4893
				{
4894 4895 4896 4897 4898 4899 4900
					/* letting join_type reduce to empty doesn't work */
					JoinExpr *n = makeNode(JoinExpr);
					n->jointype = JOIN_INNER;
					n->isNatural = FALSE;
					n->larg = $1;
					n->rarg = $3;
					if ($4 != NULL && IsA($4, List))
4901
						n->using = (List *) $4; /* USING clause */
4902 4903 4904
					else
						n->quals = $4; /* ON clause */
					$$ = n;
4905
				}
4906
			| table_ref NATURAL join_type JOIN table_ref
4907
				{
4908 4909 4910 4911 4912 4913 4914 4915
					JoinExpr *n = makeNode(JoinExpr);
					n->jointype = $3;
					n->isNatural = TRUE;
					n->larg = $1;
					n->rarg = $5;
					n->using = NIL; /* figure out which columns later... */
					n->quals = NULL; /* fill later */
					$$ = n;
4916
				}
4917
			| table_ref NATURAL JOIN table_ref
4918
				{
4919
					/* letting join_type reduce to empty doesn't work */
4920
					JoinExpr *n = makeNode(JoinExpr);
4921 4922 4923 4924 4925 4926
					n->jointype = JOIN_INNER;
					n->isNatural = TRUE;
					n->larg = $1;
					n->rarg = $4;
					n->using = NIL; /* figure out which columns later... */
					n->quals = NULL; /* fill later */
4927
					$$ = n;
4928 4929
				}
		;
4930

4931 4932
alias_clause:
			AS ColId '(' name_list ')'
4933
				{
4934 4935 4936
					$$ = makeNode(Alias);
					$$->aliasname = $2;
					$$->colnames = $4;
4937
				}
4938
			| AS ColId
4939
				{
4940 4941
					$$ = makeNode(Alias);
					$$->aliasname = $2;
4942
				}
4943
			| ColId '(' name_list ')'
4944
				{
4945 4946 4947
					$$ = makeNode(Alias);
					$$->aliasname = $1;
					$$->colnames = $3;
4948
				}
4949
			| ColId
4950
				{
4951 4952
					$$ = makeNode(Alias);
					$$->aliasname = $1;
4953
				}
4954 4955
		;

4956 4957 4958 4959
join_type:	FULL join_outer							{ $$ = JOIN_FULL; }
			| LEFT join_outer						{ $$ = JOIN_LEFT; }
			| RIGHT join_outer						{ $$ = JOIN_RIGHT; }
			| INNER_P								{ $$ = JOIN_INNER; }
4960 4961
		;

4962
/* OUTER is just noise... */
4963 4964
join_outer: OUTER_P									{ $$ = NULL; }
			| /*EMPTY*/								{ $$ = NULL; }
4965 4966
		;

4967 4968
/* JOIN qualification clauses
 * Possibilities are:
4969 4970 4971
 *	USING ( column list ) allows only unqualified column names,
 *						  which must match between tables.
 *	ON expr allows more general qualifications.
4972 4973
 *
 * We return USING as a List node, while an ON-expr will not be a List.
4974 4975
 */

4976 4977
join_qual:	USING '(' name_list ')'					{ $$ = (Node *) $3; }
			| ON a_expr								{ $$ = $2; }
4978 4979 4980
		;


4981 4982
relation_expr:
			qualified_name
4983
				{
4984
					/* default inheritance */
4985
					$$ = $1;
4986
					$$->inhOpt = INH_DEFAULT;
4987
					$$->alias = NULL;
4988
				}
4989
			| qualified_name '*'
4990
				{
4991
					/* inheritance query */
4992
					$$ = $1;
4993
					$$->inhOpt = INH_YES;
4994
					$$->alias = NULL;
4995
				}
4996
			| ONLY qualified_name
4997
				{
4998
					/* no inheritance */
4999
					$$ = $2;
5000
					$$->inhOpt = INH_NO;
5001
					$$->alias = NULL;
5002
				}
5003 5004 5005 5006 5007 5008 5009
			| ONLY '(' qualified_name ')'
				{
					/* no inheritance, SQL99-style syntax */
					$$ = $3;
					$$->inhOpt = INH_NO;
					$$->alias = NULL;
				}
5010
		;
5011

5012

5013
func_table: func_name '(' ')'
5014 5015 5016 5017 5018 5019 5020 5021
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					$$ = (Node *)n;
				}
5022
			| func_name '(' expr_list ')'
5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					$$ = (Node *)n;
				}
		;


5034 5035
where_clause:
			WHERE a_expr							{ $$ = $2; }
Bruce Momjian's avatar
Bruce Momjian committed
5036
			| /*EMPTY*/								{ $$ = NULL; }
5037
		;
5038

5039

5040
TableFuncElementList:
5041
			TableFuncElement
5042
				{
5043
					$$ = makeList1($1);
5044
				}
5045
			| TableFuncElementList ',' TableFuncElement
5046
				{
5047
					$$ = lappend($1, $3);
5048 5049 5050
				}
		;

5051
TableFuncElement:	ColId Typename
5052 5053 5054 5055 5056
				{
					ColumnDef *n = makeNode(ColumnDef);
					n->colname = $1;
					n->typename = $2;
					n->constraints = NIL;
5057
					n->is_local = true;
5058 5059 5060 5061
					$$ = (Node *)n;
				}
		;

5062 5063 5064 5065 5066 5067 5068 5069 5070 5071
/*****************************************************************************
 *
 *	Type syntax
 *		SQL92 introduces a large amount of type-specific syntax.
 *		Define individual clauses to handle these cases, and use
 *		 the generic case to handle regular type-extensible Postgres syntax.
 *		- thomas 1997-10-10
 *
 *****************************************************************************/

5072
Typename:	SimpleTypename opt_array_bounds
5073 5074 5075
				{
					$$ = $1;
					$$->arrayBounds = $2;
5076
				}
5077
			| SETOF SimpleTypename opt_array_bounds
5078
				{
5079
					$$ = $2;
5080
					$$->arrayBounds = $3;
5081 5082
					$$->setof = TRUE;
				}
5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095
			| SimpleTypename ARRAY '[' Iconst ']'
				{
					/* SQL99's redundant syntax */
					$$ = $1;
					$$->arrayBounds = makeList1(makeInteger($4));
				}
			| SETOF SimpleTypename ARRAY '[' Iconst ']'
				{
					/* SQL99's redundant syntax */
					$$ = $2;
					$$->arrayBounds = makeList1(makeInteger($5));
					$$->setof = TRUE;
				}
5096 5097
		;

5098 5099 5100 5101 5102 5103 5104
opt_array_bounds:
			opt_array_bounds '[' ']'
					{  $$ = lappend($1, makeInteger(-1)); }
			| opt_array_bounds '[' Iconst ']'
					{  $$ = lappend($1, makeInteger($3)); }
			| /*EMPTY*/
					{  $$ = NIL; }
5105 5106
		;

5107 5108 5109 5110 5111 5112 5113 5114
/*
 * XXX ideally, the production for a qualified typename should be ColId attrs
 * (there's no obvious reason why the first name should need to be restricted)
 * and should be an alternative of GenericType (so that it can be used to
 * specify a type for a literal in AExprConst).  However doing either causes
 * reduce/reduce conflicts that I haven't been able to find a workaround
 * for.  FIXME later.
 */
5115
SimpleTypename:
5116 5117 5118 5119 5120
			GenericType								{ $$ = $1; }
			| Numeric								{ $$ = $1; }
			| Bit									{ $$ = $1; }
			| Character								{ $$ = $1; }
			| ConstDatetime							{ $$ = $1; }
5121
			| ConstInterval opt_interval
5122 5123
				{
					$$ = $1;
5124 5125
					if ($2 != INTERVAL_FULL_RANGE)
						$$->typmod = INTERVAL_TYPMOD(INTERVAL_FULL_PRECISION, $2);
5126
				}
5127
			| ConstInterval '(' Iconst ')' opt_interval
5128 5129
				{
					$$ = $1;
5130
					if ($3 < 0)
5131 5132 5133 5134
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision must not be negative",
										$3)));
5135 5136
					if ($3 > MAX_INTERVAL_PRECISION)
					{
5137
						ereport(WARNING,
5138 5139 5140
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision reduced to maximum allowed, %d",
										$3, MAX_INTERVAL_PRECISION)));
5141 5142
						$3 = MAX_INTERVAL_PRECISION;
					}
5143
					$$->typmod = INTERVAL_TYPMOD($3, $5);
5144
				}
5145
			| type_name attrs
5146 5147 5148 5149 5150
				{
					$$ = makeNode(TypeName);
					$$->names = lcons(makeString($1), $2);
					$$->typmod = -1;
				}
5151 5152
		;

5153 5154 5155 5156 5157 5158 5159 5160 5161
/* We have a separate ConstTypename to allow defaulting fixed-length
 * types such as CHAR() and BIT() to an unspecified length.
 * SQL9x requires that these default to a length of one, but this
 * makes no sense for constructs like CHAR 'hi' and BIT '0101',
 * where there is an obvious better choice to make.
 * Note that ConstInterval is not included here since it must
 * be pushed up higher in the rules to accomodate the postfix
 * options (e.g. INTERVAL '1' YEAR).
 */
5162
ConstTypename:
5163 5164 5165 5166 5167
			GenericType								{ $$ = $1; }
			| Numeric								{ $$ = $1; }
			| ConstBit								{ $$ = $1; }
			| ConstCharacter						{ $$ = $1; }
			| ConstDatetime							{ $$ = $1; }
5168
		;
5169

5170 5171
GenericType:
			type_name
5172
				{
5173
					$$ = makeTypeName($1);
5174 5175 5176 5177 5178 5179
				}
		;

/* SQL92 numeric data types
 * Check FLOAT() precision limits assuming IEEE floating types.
 * - thomas 1997-09-18
5180
 * Provide real DECIMAL() and NUMERIC() implementations now - Jan 1998-12-30
5181
 */
5182
Numeric:	INT_P
5183 5184 5185
				{
					$$ = SystemTypeName("int4");
				}
5186
			| INTEGER
5187 5188 5189
				{
					$$ = SystemTypeName("int4");
				}
5190
			| SMALLINT
5191 5192 5193
				{
					$$ = SystemTypeName("int2");
				}
5194
			| BIGINT
5195 5196 5197
				{
					$$ = SystemTypeName("int8");
				}
5198
			| REAL
5199 5200 5201
				{
					$$ = SystemTypeName("float4");
				}
5202
			| FLOAT_P opt_float
5203
				{
5204
					$$ = $2;
5205
				}
5206
			| DOUBLE_P PRECISION
5207
				{
5208
					$$ = SystemTypeName("float8");
5209
				}
5210
			| DECIMAL_P opt_decimal
5211
				{
5212
					$$ = SystemTypeName("numeric");
5213 5214
					$$->typmod = $2;
				}
5215
			| DEC opt_decimal
5216
				{
5217
					$$ = SystemTypeName("numeric");
5218
					$$->typmod = $2;
5219
				}
5220
			| NUMERIC opt_numeric
5221
				{
5222
					$$ = SystemTypeName("numeric");
5223
					$$->typmod = $2;
5224
				}
5225
			| BOOLEAN_P
5226 5227 5228
				{
					$$ = SystemTypeName("bool");
				}
5229
		;
5230

5231
opt_float:	'(' Iconst ')'
5232 5233
				{
					if ($2 < 1)
5234 5235
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
5236
								 errmsg("precision for type float must be at least 1 bit")));
5237
					else if ($2 <= 24)
5238
						$$ = SystemTypeName("float4");
5239
					else if ($2 <= 53)
5240
						$$ = SystemTypeName("float8");
5241
					else
5242 5243
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
5244
								 errmsg("precision for type float must be less than 54 bits")));
5245
				}
5246
			| /*EMPTY*/
5247
				{
5248
					$$ = SystemTypeName("float8");
5249 5250 5251
				}
		;

5252 5253
opt_numeric:
			'(' Iconst ',' Iconst ')'
5254
				{
5255
					if ($2 < 1 || $2 > NUMERIC_MAX_PRECISION)
5256 5257 5258 5259
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("NUMERIC precision %d must be between 1 and %d",
										$2, NUMERIC_MAX_PRECISION)));
5260
					if ($4 < 0 || $4 > $2)
5261 5262 5263 5264
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("NUMERIC scale %d must be between 0 and precision %d",
										$4, $2)));
5265 5266

					$$ = (($2 << 16) | $4) + VARHDRSZ;
5267
				}
5268
			| '(' Iconst ')'
5269
				{
5270
					if ($2 < 1 || $2 > NUMERIC_MAX_PRECISION)
5271 5272 5273 5274
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("NUMERIC precision %d must be between 1 and %d",
										$2, NUMERIC_MAX_PRECISION)));
5275 5276

					$$ = ($2 << 16) + VARHDRSZ;
5277
				}
5278
			| /*EMPTY*/
5279
				{
5280
					/* Insert "-1" meaning "no limit" */
5281
					$$ = -1;
5282 5283 5284
				}
		;

5285 5286
opt_decimal:
			'(' Iconst ',' Iconst ')'
5287
				{
5288
					if ($2 < 1 || $2 > NUMERIC_MAX_PRECISION)
5289 5290 5291 5292
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("DECIMAL precision %d must be between 1 and %d",
										$2, NUMERIC_MAX_PRECISION)));
5293
					if ($4 < 0 || $4 > $2)
5294 5295 5296 5297
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("DECIMAL scale %d must be between 0 and precision %d",
										$4, $2)));
5298 5299

					$$ = (($2 << 16) | $4) + VARHDRSZ;
5300
				}
5301
			| '(' Iconst ')'
5302
				{
5303
					if ($2 < 1 || $2 > NUMERIC_MAX_PRECISION)
5304 5305 5306 5307
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("DECIMAL precision %d must be between 1 and %d",
										$2, NUMERIC_MAX_PRECISION)));
5308 5309

					$$ = ($2 << 16) + VARHDRSZ;
5310
				}
5311
			| /*EMPTY*/
5312
				{
5313
					/* Insert "-1" meaning "no limit" */
5314
					$$ = -1;
5315 5316 5317
				}
		;

5318

5319 5320 5321 5322
/*
 * SQL92 bit-field data types
 * The following implements BIT() and BIT VARYING().
 */
5323 5324 5325 5326 5327 5328 5329 5330 5331 5332
Bit:		BitWithLength
				{
					$$ = $1;
				}
			| BitWithoutLength
				{
					$$ = $1;
				}
		;

5333 5334
/* ConstBit is like Bit except "BIT" defaults to unspecified length */
/* See notes for ConstCharacter, which addresses same issue for "CHAR" */
5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347
ConstBit:	BitWithLength
				{
					$$ = $1;
				}
			| BitWithoutLength
				{
					$$->typmod = -1;
					$$ = $1;
				}
		;

BitWithLength:
			BIT opt_varying '(' Iconst ')'
5348
				{
5349 5350 5351 5352 5353
					char *typname;

					typname = $2 ? "varbit" : "bit";
					$$ = SystemTypeName(typname);
					if ($4 < 1)
5354 5355 5356 5357
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("length for type %s must be at least 1",
										typname)));
5358
					else if ($4 > (MaxAttrSize * BITS_PER_BYTE))
5359 5360 5361 5362
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("length for type %s cannot exceed %d",
										typname, MaxAttrSize * BITS_PER_BYTE)));
5363
					$$->typmod = $4;
5364
				}
5365 5366 5367 5368
		;

BitWithoutLength:
			BIT opt_varying
5369
				{
5370
					/* bit defaults to bit(1), varbit to no limit */
5371 5372 5373
					if ($2)
					{
						$$ = SystemTypeName("varbit");
5374
						$$->typmod = -1;
5375 5376 5377 5378 5379 5380
					}
					else
					{
						$$ = SystemTypeName("bit");
						$$->typmod = 1;
					}
5381
				}
5382
		;
5383 5384


5385 5386
/*
 * SQL92 character data types
5387 5388
 * The following implements CHAR() and VARCHAR().
 */
5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416
Character:  CharacterWithLength
				{
					$$ = $1;
				}
			| CharacterWithoutLength
				{
					$$ = $1;
				}
		;

ConstCharacter:  CharacterWithLength
				{
					$$ = $1;
				}
			| CharacterWithoutLength
				{
					/* Length was not specified so allow to be unrestricted.
					 * This handles problems with fixed-length (bpchar) strings
					 * which in column definitions must default to a length
					 * of one, but should not be constrained if the length
					 * was not specified.
					 */
					$1->typmod = -1;
					$$ = $1;
				}
		;

CharacterWithLength:  character '(' Iconst ')' opt_charset
5417
				{
5418 5419 5420 5421 5422 5423 5424 5425
					if (($5 != NULL) && (strcmp($5, "sql_text") != 0))
					{
						char *type;

						type = palloc(strlen($1) + 1 + strlen($5) + 1);
						strcpy(type, $1);
						strcat(type, "_");
						strcat(type, $5);
5426
						$1 = type;
5427 5428
					}

5429
					$$ = SystemTypeName($1);
5430

5431
					if ($3 < 1)
5432 5433 5434 5435
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("length for type %s must be at least 1",
										$1)));
5436
					else if ($3 > MaxAttrSize)
5437 5438 5439 5440
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("length for type %s cannot exceed %d",
										$1, MaxAttrSize)));
5441

5442
					/* we actually implement these like a varlen, so
5443
					 * the first 4 bytes is the length. (the difference
5444 5445
					 * between these and "text" is that we blank-pad and
					 * truncate where necessary)
5446
					 */
5447
					$$->typmod = VARHDRSZ + $3;
5448
				}
5449 5450 5451
		;

CharacterWithoutLength:	 character opt_charset
5452
				{
5453 5454 5455 5456 5457 5458 5459 5460
					if (($2 != NULL) && (strcmp($2, "sql_text") != 0))
					{
						char *type;

						type = palloc(strlen($1) + 1 + strlen($2) + 1);
						strcpy(type, $1);
						strcat(type, "_");
						strcat(type, $2);
5461
						$1 = type;
5462 5463
					}

5464
					$$ = SystemTypeName($1);
5465

5466 5467 5468 5469 5470
					/* char defaults to char(1), varchar to no limit */
					if (strcmp($1, "bpchar") == 0)
						$$->typmod = VARHDRSZ + 1;
					else
						$$->typmod = -1;
5471
				}
5472 5473
		;

5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485
character:	CHARACTER opt_varying
										{ $$ = $2 ? "varchar": "bpchar"; }
			| CHAR_P opt_varying
										{ $$ = $2 ? "varchar": "bpchar"; }
			| VARCHAR
										{ $$ = "varchar"; }
			| NATIONAL CHARACTER opt_varying
										{ $$ = $3 ? "varchar": "bpchar"; }
			| NATIONAL CHAR_P opt_varying
										{ $$ = $3 ? "varchar": "bpchar"; }
			| NCHAR opt_varying
										{ $$ = $2 ? "varchar": "bpchar"; }
5486 5487
		;

5488 5489 5490
opt_varying:
			VARYING									{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
5491 5492
		;

5493 5494 5495
opt_charset:
			CHARACTER SET ColId						{ $$ = $3; }
			| /*EMPTY*/								{ $$ = NULL; }
5496 5497
		;

5498 5499
ConstDatetime:
			TIMESTAMP '(' Iconst ')' opt_timezone
5500 5501
				{
					if ($5)
5502
						$$ = SystemTypeName("timestamptz");
5503
					else
5504
						$$ = SystemTypeName("timestamp");
5505 5506 5507 5508
					/* XXX the timezone field seems to be unused
					 * - thomas 2001-09-06
					 */
					$$->timezone = $5;
5509
					if ($3 < 0)
5510 5511 5512 5513
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("TIMESTAMP(%d)%s precision must not be negative",
										$3, ($5 ? " WITH TIME ZONE": ""))));
5514 5515
					if ($3 > MAX_TIMESTAMP_PRECISION)
					{
5516
						ereport(WARNING,
5517 5518 5519 5520
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("TIMESTAMP(%d)%s precision reduced to maximum allowed, %d",
										$3, ($5 ? " WITH TIME ZONE": ""),
										MAX_TIMESTAMP_PRECISION)));
5521 5522
						$3 = MAX_TIMESTAMP_PRECISION;
					}
5523 5524
					$$->typmod = $3;
				}
5525
			| TIMESTAMP opt_timezone
5526
				{
5527
					if ($2)
5528
						$$ = SystemTypeName("timestamptz");
5529
					else
5530
						$$ = SystemTypeName("timestamp");
5531 5532 5533
					/* XXX the timezone field seems to be unused
					 * - thomas 2001-09-06
					 */
5534
					$$->timezone = $2;
5535 5536 5537 5538 5539 5540
					/* SQL99 specified a default precision of six
					 * for schema definitions. But for timestamp
					 * literals we don't want to throw away precision
					 * so leave this as unspecified for now.
					 * Later, we may want a different production
					 * for schemas. - thomas 2001-12-07
5541
					 */
5542
					$$->typmod = -1;
5543
				}
5544
			| TIME '(' Iconst ')' opt_timezone
5545 5546
				{
					if ($5)
5547
						$$ = SystemTypeName("timetz");
5548
					else
5549
						$$ = SystemTypeName("time");
5550
					if ($3 < 0)
5551 5552 5553 5554
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("TIME(%d)%s precision must not be negative",
										$3, ($5 ? " WITH TIME ZONE": ""))));
5555 5556
					if ($3 > MAX_TIME_PRECISION)
					{
5557
						ereport(WARNING,
5558 5559 5560 5561
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("TIME(%d)%s precision reduced to maximum allowed, %d",
										$3, ($5 ? " WITH TIME ZONE": ""),
										MAX_TIME_PRECISION)));
5562 5563
						$3 = MAX_TIME_PRECISION;
					}
5564
					$$->typmod = $3;
5565
				}
5566
			| TIME opt_timezone
5567
				{
5568
					if ($2)
5569
						$$ = SystemTypeName("timetz");
5570
					else
5571
						$$ = SystemTypeName("time");
5572
					/* SQL99 specified a default precision of zero.
5573 5574
					 * See comments for timestamp above on why we will
					 * leave this unspecified for now. - thomas 2001-12-07
5575
					 */
5576
					$$->typmod = -1;
5577
				}
5578 5579
		;

5580 5581
ConstInterval:
			INTERVAL								{ $$ = SystemTypeName("interval"); }
5582
		;
5583

5584 5585 5586 5587
opt_timezone:
			WITH TIME ZONE							{ $$ = TRUE; }
			| WITHOUT TIME ZONE						{ $$ = FALSE; }
			| /*EMPTY*/								{ $$ = FALSE; }
5588 5589
		;

5590
opt_interval:
5591 5592 5593 5594 5595 5596
			YEAR_P									{ $$ = INTERVAL_MASK(YEAR); }
			| MONTH_P								{ $$ = INTERVAL_MASK(MONTH); }
			| DAY_P									{ $$ = INTERVAL_MASK(DAY); }
			| HOUR_P								{ $$ = INTERVAL_MASK(HOUR); }
			| MINUTE_P								{ $$ = INTERVAL_MASK(MINUTE); }
			| SECOND_P								{ $$ = INTERVAL_MASK(SECOND); }
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5597
			| YEAR_P TO MONTH_P
5598
					{ $$ = INTERVAL_MASK(YEAR) | INTERVAL_MASK(MONTH); }
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5599
			| DAY_P TO HOUR_P
5600
					{ $$ = INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR); }
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5601
			| DAY_P TO MINUTE_P
5602 5603
					{ $$ = INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR)
						| INTERVAL_MASK(MINUTE); }
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5604
			| DAY_P TO SECOND_P
5605 5606
					{ $$ = INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR)
						| INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND); }
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5607
			| HOUR_P TO MINUTE_P
5608
					{ $$ = INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE); }
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5609
			| HOUR_P TO SECOND_P
5610 5611
					{ $$ = INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE)
						| INTERVAL_MASK(SECOND); }
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5612
			| MINUTE_P TO SECOND_P
5613 5614
					{ $$ = INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND); }
			| /*EMPTY*/								{ $$ = INTERVAL_FULL_RANGE; }
5615 5616
		;

5617 5618 5619

/*****************************************************************************
 *
5620
 *	expression grammar
5621 5622 5623
 *
 *****************************************************************************/

5624 5625
/* Expressions using row descriptors
 * Define row_descriptor to allow yacc to break the reduce/reduce conflict
5626 5627
 * with singleton expressions. Use SQL99's ROW keyword to allow rows of
 * one element.
5628
 */
5629
r_expr:  row IN_P select_with_parens
5630
				{
5631
					SubLink *n = makeNode(SubLink);
5632
					n->subLinkType = ANY_SUBLINK;
5633 5634
					n->lefthand = $1;
					n->operName = makeList1(makeString("="));
5635
					n->subselect = $3;
5636
					$$ = (Node *)n;
5637
				}
5638
			| row NOT IN_P select_with_parens
5639
				{
5640
					/* Make an IN node */
5641
					SubLink *n = makeNode(SubLink);
5642
					n->subLinkType = ANY_SUBLINK;
5643 5644
					n->lefthand = $1;
					n->operName = makeList1(makeString("="));
5645
					n->subselect = $4;
5646
					/* Stick a NOT on top */
5647
					$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL, (Node *) n);
5648
				}
5649
			| row qual_all_Op sub_type select_with_parens
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5650
			%prec Op
5651 5652
				{
					SubLink *n = makeNode(SubLink);
5653
					n->subLinkType = $3;
5654 5655
					n->lefthand = $1;
					n->operName = $2;
5656
					n->subselect = $4;
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5657 5658
					$$ = (Node *)n;
				}
5659
			| row qual_all_Op select_with_parens
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5660
			%prec Op
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5661 5662
				{
					SubLink *n = makeNode(SubLink);
5663
					n->subLinkType = MULTIEXPR_SUBLINK;
5664 5665
					n->lefthand = $1;
					n->operName = $2;
5666
					n->subselect = $3;
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5667 5668
					$$ = (Node *)n;
				}
5669
			| row qual_all_Op row
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5670
			%prec Op
5671
				{
5672
					$$ = makeRowExpr($2, $1, $3);
5673
				}
5674
			| row IS NULL_P
5675
				{
5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686
					$$ = makeRowNullTest(IS_NULL, $1);
				}
			| row IS NOT NULL_P
				{
					$$ = makeRowNullTest(IS_NOT_NULL, $1);
				}
			| row OVERLAPS row
				{
					$$ = (Node *)makeOverlaps($1, $3);
				}
			| row IS DISTINCT FROM row
5687
			%prec IS
5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702
				{
					/* IS DISTINCT FROM has the following rules for non-array types:
					 * a) the row lengths must be equal
					 * b) if both rows are zero-length, then they are not distinct
					 * c) if any element is distinct, the rows are distinct
					 * The rules for an element being distinct:
					 * a) if the elements are both NULL, then they are not distinct
					 * b) if the elements compare to be equal, then they are not distinct
					 * c) otherwise, they are distinct
					 */
					List *largs = $1;
					List *rargs = $5;
					/* lengths don't match? then complain */
					if (length(largs) != length(rargs))
					{
5703 5704 5705
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("unequal number of entries in row expression")));
5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716
					}
					/* both are zero-length rows? then they are not distinct */
					else if (length(largs) <= 0)
					{
						$$ = (Node *)makeBoolConst(FALSE);
					}
					/* otherwise, we need to compare each element */
					else
					{
						$$ = (Node *)makeDistinctExpr(largs, rargs);
					}
5717
				}
5718 5719
		;

5720 5721 5722 5723 5724 5725 5726 5727
/* Explicit row production.
 * SQL99 allows an optional ROW keyword, so we can now do single-element productions
 * without conflicting with the parenthesized a_expr production.
 */
row:  ROW '(' row_descriptor ')'					{ $$ = $3; }
			| ROW '(' a_expr ')'					{ $$ = makeList1($3); }
			| ROW '(' ')'							{ $$ = NULL; }
			| '(' row_descriptor ')'				{ $$ = $2; }
5728 5729
		;

5730
row_descriptor:  expr_list ',' a_expr				{ $$ = lappend($1, $3); }
5731
		;
5732

5733 5734 5735
sub_type:	ANY										{ $$ = ANY_SUBLINK; }
			| SOME									{ $$ = ANY_SUBLINK; }
			| ALL									{ $$ = ALL_SUBLINK; }
5736 5737
		;

5738 5739 5740
all_Op:		Op										{ $$ = $1; }
			| MathOp								{ $$ = $1; }
		;
5741

5742 5743 5744 5745 5746 5747 5748 5749 5750
MathOp:		 '+'									{ $$ = "+"; }
			| '-'									{ $$ = "-"; }
			| '*'									{ $$ = "*"; }
			| '/'									{ $$ = "/"; }
			| '%'									{ $$ = "%"; }
			| '^'									{ $$ = "^"; }
			| '<'									{ $$ = "<"; }
			| '>'									{ $$ = ">"; }
			| '='									{ $$ = "="; }
5751 5752
		;

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5753 5754
qual_Op:	Op
					{ $$ = makeList1(makeString($1)); }
5755
			| OPERATOR '(' any_operator ')'			{ $$ = $3; }
5756 5757
		;

5758
qual_all_Op:
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5759 5760
			all_Op
					{ $$ = makeList1(makeString($1)); }
5761
			| OPERATOR '(' any_operator ')'			{ $$ = $3; }
5762 5763
		;

5764 5765
/*
 * General expressions
5766
 * This is the heart of the expression syntax.
5767 5768 5769 5770 5771 5772 5773 5774 5775 5776
 *
 * We have two expression types: a_expr is the unrestricted kind, and
 * b_expr is a subset that must be used in some places to avoid shift/reduce
 * conflicts.  For example, we can't do BETWEEN as "BETWEEN a_expr AND a_expr"
 * because that use of AND conflicts with AND as a boolean operator.  So,
 * b_expr is used in BETWEEN and we remove boolean keywords from b_expr.
 *
 * Note that '(' a_expr ')' is a b_expr, so an unrestricted expression can
 * always be used by surrounding it with parens.
 *
5777
 * c_expr is all the productions that are common to a_expr and b_expr;
5778
 * it's factored out just to eliminate redundant coding.
5779
 */
5780
a_expr:		c_expr									{ $$ = $1; }
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5781 5782
			| a_expr TYPECAST Typename
					{ $$ = makeTypeCast($1, $3); }
5783
			| a_expr AT TIME ZONE c_expr
5784 5785
				{
					FuncCall *n = makeNode(FuncCall);
5786
					n->funcname = SystemFuncName("timezone");
5787 5788 5789 5790 5791
					n->args = makeList2($5, $1);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					$$ = (Node *) n;
				}
5792 5793 5794 5795 5796 5797 5798 5799 5800
		/*
		 * These operators must be called out explicitly in order to make use
		 * of yacc/bison's automatic operator-precedence handling.  All other
		 * operator names are handled by the generic productions using "Op",
		 * below; and all those operators will have the same precedence.
		 *
		 * If you add more explicitly-known operators, be sure to add them
		 * also to b_expr and to the MathOp list above.
		 */
5801
			| '+' a_expr					%prec UMINUS
5802
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "+", NULL, $2); }
5803 5804 5805
			| '-' a_expr					%prec UMINUS
				{ $$ = doNegate($2); }
			| '%' a_expr
5806
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "%", NULL, $2); }
5807
			| '^' a_expr
5808
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "^", NULL, $2); }
5809
			| a_expr '%'
5810
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "%", $1, NULL); }
5811
			| a_expr '^'
5812
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "^", $1, NULL); }
5813
			| a_expr '+' a_expr
5814
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "+", $1, $3); }
5815
			| a_expr '-' a_expr
5816
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "-", $1, $3); }
5817
			| a_expr '*' a_expr
5818
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "*", $1, $3); }
5819
			| a_expr '/' a_expr
5820
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "/", $1, $3); }
5821
			| a_expr '%' a_expr
5822
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "%", $1, $3); }
5823
			| a_expr '^' a_expr
5824
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "^", $1, $3); }
5825
			| a_expr '<' a_expr
5826
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $3); }
5827
			| a_expr '>' a_expr
5828
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $3); }
5829
			| a_expr '=' a_expr
5830
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "=", $1, $3); }
5831 5832

			| a_expr qual_Op a_expr				%prec Op
5833
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $2, $1, $3); }
5834
			| qual_Op a_expr					%prec Op
5835
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $1, NULL, $2); }
5836
			| a_expr qual_Op					%prec POSTFIXOP
5837
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $2, $1, NULL); }
5838 5839

			| a_expr AND a_expr
5840
				{ $$ = (Node *) makeA_Expr(AEXPR_AND, NIL, $1, $3); }
5841
			| a_expr OR a_expr
5842
				{ $$ = (Node *) makeA_Expr(AEXPR_OR, NIL, $1, $3); }
5843
			| NOT a_expr
5844
				{ $$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL, $2); }
5845 5846

			| a_expr LIKE a_expr
5847
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~~", $1, $3); }
5848
			| a_expr LIKE a_expr ESCAPE a_expr
5849 5850
				{
					FuncCall *n = makeNode(FuncCall);
5851
					n->funcname = SystemFuncName("like_escape");
5852
					n->args = makeList2($3, $5);
5853 5854
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
5855
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~~", $1, (Node *) n);
5856
				}
5857
			| a_expr NOT LIKE a_expr
5858
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~~", $1, $4); }
5859
			| a_expr NOT LIKE a_expr ESCAPE a_expr
5860 5861
				{
					FuncCall *n = makeNode(FuncCall);
5862
					n->funcname = SystemFuncName("like_escape");
5863
					n->args = makeList2($4, $6);
5864 5865
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
5866
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~~", $1, (Node *) n);
5867
				}
5868
			| a_expr ILIKE a_expr
5869
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~~*", $1, $3); }
5870
			| a_expr ILIKE a_expr ESCAPE a_expr
5871 5872
				{
					FuncCall *n = makeNode(FuncCall);
5873
					n->funcname = SystemFuncName("like_escape");
5874
					n->args = makeList2($3, $5);
5875 5876
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
5877
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~~*", $1, (Node *) n);
5878
				}
5879
			| a_expr NOT ILIKE a_expr
5880
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~~*", $1, $4); }
5881
			| a_expr NOT ILIKE a_expr ESCAPE a_expr
5882 5883
				{
					FuncCall *n = makeNode(FuncCall);
5884
					n->funcname = SystemFuncName("like_escape");
5885
					n->args = makeList2($4, $6);
5886 5887
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
5888
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~~*", $1, (Node *) n);
5889
				}
5890

5891
			| a_expr SIMILAR TO a_expr				%prec SIMILAR
5892 5893 5894 5895 5896 5897 5898 5899
				{
					A_Const *c = makeNode(A_Const);
					FuncCall *n = makeNode(FuncCall);
					c->val.type = T_Null;
					n->funcname = SystemFuncName("similar_escape");
					n->args = makeList2($4, (Node *) c);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
5900
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~", $1, (Node *) n);
5901
				}
5902
			| a_expr SIMILAR TO a_expr ESCAPE a_expr
5903 5904
				{
					FuncCall *n = makeNode(FuncCall);
5905
					n->funcname = SystemFuncName("similar_escape");
5906 5907 5908
					n->args = makeList2($4, $6);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
5909
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~", $1, (Node *) n);
5910
				}
5911
			| a_expr NOT SIMILAR TO a_expr			%prec SIMILAR
5912 5913 5914 5915 5916 5917 5918 5919
				{
					A_Const *c = makeNode(A_Const);
					FuncCall *n = makeNode(FuncCall);
					c->val.type = T_Null;
					n->funcname = SystemFuncName("similar_escape");
					n->args = makeList2($5, (Node *) c);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
5920
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~", $1, (Node *) n);
5921
				}
5922
			| a_expr NOT SIMILAR TO a_expr ESCAPE a_expr
5923 5924
				{
					FuncCall *n = makeNode(FuncCall);
5925
					n->funcname = SystemFuncName("similar_escape");
5926 5927 5928
					n->args = makeList2($5, $7);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
5929
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~", $1, (Node *) n);
5930 5931
				}

5932 5933 5934 5935 5936 5937 5938 5939 5940 5941
			/* NullTest clause
			 * Define SQL92-style Null test clause.
			 * Allow two forms described in the standard:
			 *	a IS NULL
			 *	a IS NOT NULL
			 * Allow two SQL extensions
			 *	a ISNULL
			 *	a NOTNULL
			 */
			| a_expr ISNULL
5942 5943
				{
					NullTest *n = makeNode(NullTest);
5944
					n->arg = (Expr *) $1;
5945 5946 5947
					n->nulltesttype = IS_NULL;
					$$ = (Node *)n;
				}
5948
			| a_expr IS NULL_P
5949 5950
				{
					NullTest *n = makeNode(NullTest);
5951
					n->arg = (Expr *) $1;
5952 5953 5954
					n->nulltesttype = IS_NULL;
					$$ = (Node *)n;
				}
5955
			| a_expr NOTNULL
5956 5957
				{
					NullTest *n = makeNode(NullTest);
5958
					n->arg = (Expr *) $1;
5959 5960 5961
					n->nulltesttype = IS_NOT_NULL;
					$$ = (Node *)n;
				}
5962
			| a_expr IS NOT NULL_P
5963 5964
				{
					NullTest *n = makeNode(NullTest);
5965
					n->arg = (Expr *) $1;
5966 5967 5968
					n->nulltesttype = IS_NOT_NULL;
					$$ = (Node *)n;
				}
5969
			| a_expr IS TRUE_P
5970
				{
5971
					BooleanTest *b = makeNode(BooleanTest);
5972
					b->arg = (Expr *) $1;
5973 5974
					b->booltesttype = IS_TRUE;
					$$ = (Node *)b;
5975
				}
5976
			| a_expr IS NOT TRUE_P
5977
				{
5978
					BooleanTest *b = makeNode(BooleanTest);
5979
					b->arg = (Expr *) $1;
5980 5981
					b->booltesttype = IS_NOT_TRUE;
					$$ = (Node *)b;
5982
				}
5983
			| a_expr IS FALSE_P
5984
				{
5985
					BooleanTest *b = makeNode(BooleanTest);
5986
					b->arg = (Expr *) $1;
5987 5988
					b->booltesttype = IS_FALSE;
					$$ = (Node *)b;
5989
				}
5990
			| a_expr IS NOT FALSE_P
5991
				{
5992
					BooleanTest *b = makeNode(BooleanTest);
5993
					b->arg = (Expr *) $1;
5994 5995 5996
					b->booltesttype = IS_NOT_FALSE;
					$$ = (Node *)b;
				}
5997
			| a_expr IS UNKNOWN
5998 5999
				{
					BooleanTest *b = makeNode(BooleanTest);
6000
					b->arg = (Expr *) $1;
6001 6002 6003
					b->booltesttype = IS_UNKNOWN;
					$$ = (Node *)b;
				}
6004
			| a_expr IS NOT UNKNOWN
6005 6006
				{
					BooleanTest *b = makeNode(BooleanTest);
6007
					b->arg = (Expr *) $1;
6008 6009
					b->booltesttype = IS_NOT_UNKNOWN;
					$$ = (Node *)b;
6010
				}
6011
			| a_expr IS DISTINCT FROM a_expr			%prec IS
6012
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=", $1, $5); }
6013
			| a_expr IS OF '(' type_list ')'			%prec IS
6014
				{
6015
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "=", $1, (Node *) $5);
6016
				}
6017
			| a_expr IS NOT OF '(' type_list ')'		%prec IS
6018
				{
6019
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "!=", $1, (Node *) $6);
6020
				}
6021
			| a_expr BETWEEN b_expr AND b_expr			%prec BETWEEN
6022
				{
6023 6024 6025
					$$ = (Node *) makeA_Expr(AEXPR_AND, NIL,
						(Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $3),
						(Node *) makeSimpleA_Expr(AEXPR_OP, "<=", $1, $5));
6026
				}
6027
			| a_expr NOT BETWEEN b_expr AND b_expr		%prec BETWEEN
6028
				{
6029 6030 6031
					$$ = (Node *) makeA_Expr(AEXPR_OR, NIL,
						(Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $4),
						(Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $6));
6032
				}
6033
			| a_expr IN_P in_expr
6034
				{
6035
					/* in_expr returns a SubLink or a list of a_exprs */
6036
					if (IsA($3, SubLink))
6037
					{
6038
							SubLink *n = (SubLink *)$3;
6039
							n->subLinkType = ANY_SUBLINK;
6040 6041
							n->lefthand = makeList1($1);
							n->operName = makeList1(makeString("="));
6042
							$$ = (Node *)n;
6043
					}
6044 6045 6046 6047
					else
					{
						Node *n = NULL;
						List *l;
6048
						foreach(l, (List *) $3)
6049
						{
6050
							Node *cmp;
6051
							cmp = (Node *) makeSimpleA_Expr(AEXPR_OP, "=", $1, lfirst(l));
6052 6053 6054
							if (n == NULL)
								n = cmp;
							else
6055
								n = (Node *) makeA_Expr(AEXPR_OR, NIL, n, cmp);
6056 6057 6058
						}
						$$ = n;
					}
6059
				}
6060
			| a_expr NOT IN_P in_expr
6061
				{
6062
					/* in_expr returns a SubLink or a list of a_exprs */
6063
					if (IsA($4, SubLink))
6064
					{
6065
						/* Make an IN node */
6066
						SubLink *n = (SubLink *)$4;
6067
						n->subLinkType = ANY_SUBLINK;
6068 6069
						n->lefthand = makeList1($1);
						n->operName = makeList1(makeString("="));
6070
						/* Stick a NOT on top */
6071
						$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL, (Node *) n);
6072 6073 6074 6075 6076
					}
					else
					{
						Node *n = NULL;
						List *l;
6077
						foreach(l, (List *) $4)
6078
						{
6079
							Node *cmp;
6080
							cmp = (Node *) makeSimpleA_Expr(AEXPR_OP, "<>", $1, lfirst(l));
6081 6082 6083
							if (n == NULL)
								n = cmp;
							else
6084
								n = (Node *) makeA_Expr(AEXPR_AND, NIL, n, cmp);
6085 6086
						}
						$$ = n;
6087 6088
					}
				}
Bruce Momjian's avatar
Bruce Momjian committed
6089
			| a_expr qual_all_Op sub_type select_with_parens %prec Op
Bruce Momjian's avatar
Bruce Momjian committed
6090 6091
				{
					SubLink *n = makeNode(SubLink);
6092
					n->subLinkType = $3;
6093 6094
					n->lefthand = makeList1($1);
					n->operName = $2;
6095
					n->subselect = $4;
Bruce Momjian's avatar
Bruce Momjian committed
6096 6097
					$$ = (Node *)n;
				}
6098 6099 6100 6101 6102 6103 6104
			| a_expr qual_all_Op sub_type '(' a_expr ')' %prec Op
				{
					if ($3 == ANY_SUBLINK)
						$$ = (Node *) makeA_Expr(AEXPR_OP_ANY, $2, $1, $5);
					else
						$$ = (Node *) makeA_Expr(AEXPR_OP_ALL, $2, $1, $5);
				}
6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115
			| UNIQUE select_with_parens %prec Op
				{
					/* Not sure how to get rid of the parentheses
					 * but there are lots of shift/reduce errors without them.
					 *
					 * Should be able to implement this by plopping the entire
					 * select into a node, then transforming the target expressions
					 * from whatever they are into count(*), and testing the
					 * entire result equal to one.
					 * But, will probably implement a separate node in the executor.
					 */
6116 6117 6118
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("UNIQUE predicate is not yet implemented")));
6119
				}
6120
			| r_expr
6121
				{ $$ = $1; }
6122
		;
6123

6124 6125 6126 6127 6128
/*
 * Restricted expressions
 *
 * b_expr is a subset of the complete expression syntax defined by a_expr.
 *
6129
 * Presently, AND, NOT, IS, and IN are the a_expr keywords that would
6130 6131
 * cause trouble in the places where b_expr is used.  For simplicity, we
 * just eliminate all the boolean-keyword-operator productions from b_expr.
6132
 */
6133 6134 6135 6136 6137
b_expr:		c_expr
				{ $$ = $1; }
			| b_expr TYPECAST Typename
				{ $$ = makeTypeCast($1, $3); }
			| '+' b_expr					%prec UMINUS
6138
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "+", NULL, $2); }
6139 6140 6141
			| '-' b_expr					%prec UMINUS
				{ $$ = doNegate($2); }
			| '%' b_expr
6142
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "%", NULL, $2); }
6143
			| '^' b_expr
6144
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "^", NULL, $2); }
6145
			| b_expr '%'
6146
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "%", $1, NULL); }
6147
			| b_expr '^'
6148
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "^", $1, NULL); }
6149
			| b_expr '+' b_expr
6150
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "+", $1, $3); }
6151
			| b_expr '-' b_expr
6152
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "-", $1, $3); }
6153
			| b_expr '*' b_expr
6154
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "*", $1, $3); }
6155
			| b_expr '/' b_expr
6156
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "/", $1, $3); }
6157
			| b_expr '%' b_expr
6158
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "%", $1, $3); }
6159
			| b_expr '^' b_expr
6160
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "^", $1, $3); }
6161
			| b_expr '<' b_expr
6162
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $3); }
6163
			| b_expr '>' b_expr
6164
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $3); }
6165
			| b_expr '=' b_expr
6166
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "=", $1, $3); }
6167
			| b_expr qual_Op b_expr				%prec Op
6168
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $2, $1, $3); }
6169
			| qual_Op b_expr					%prec Op
6170
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $1, NULL, $2); }
6171
			| b_expr qual_Op					%prec POSTFIXOP
6172
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $2, $1, NULL); }
6173
			| b_expr IS DISTINCT FROM b_expr	%prec IS
6174
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=", $1, $5); }
6175
			| b_expr IS OF '(' type_list ')'	%prec IS
6176
				{
6177
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "=", $1, (Node *) $5);
6178
				}
6179
			| b_expr IS NOT OF '(' type_list ')'	%prec IS
6180
				{
6181
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "!=", $1, (Node *) $6);
6182
				}
6183 6184 6185 6186 6187 6188
		;

/*
 * Productions that can be used in both a_expr and b_expr.
 *
 * Note: productions that refer recursively to a_expr or b_expr mostly
6189
 * cannot appear here.	However, it's OK to refer to a_exprs that occur
6190 6191 6192
 * inside parentheses, such as function arguments; that cannot introduce
 * ambiguity to the b_expr syntax.
 */
6193 6194 6195
c_expr:		columnref								{ $$ = (Node *) $1; }
			| AexprConst							{ $$ = $1; }
			| PARAM attrs opt_indirection
6196
				{
6197 6198 6199 6200 6201 6202 6203 6204
					/*
					 * PARAM without field names is considered a constant,
					 * but with 'em, it is not.  Not very consistent ...
					 */
					ParamRef *n = makeNode(ParamRef);
					n->number = $1;
					n->fields = $2;
					n->indirection = $3;
6205
					$$ = (Node *)n;
6206
				}
6207
			| '(' a_expr ')' attrs opt_indirection
6208 6209 6210 6211 6212 6213 6214
				{
					ExprFieldSelect *n = makeNode(ExprFieldSelect);
					n->arg = $2;
					n->fields = $4;
					n->indirection = $5;
					$$ = (Node *)n;
				}
6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227
			| '(' a_expr ')' opt_indirection
				{
					if ($4)
					{
						ExprFieldSelect *n = makeNode(ExprFieldSelect);
						n->arg = $2;
						n->fields = NIL;
						n->indirection = $4;
						$$ = (Node *)n;
					}
					else
						$$ = $2;
				}
6228 6229 6230
			| case_expr
				{ $$ = $1; }
			| func_name '(' ')'
6231 6232 6233 6234
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
6235 6236
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6237 6238
					$$ = (Node *)n;
				}
6239
			| func_name '(' expr_list ')'
6240 6241 6242 6243
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
6244 6245
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6246 6247
					$$ = (Node *)n;
				}
6248
			| func_name '(' ALL expr_list ')'
6249 6250 6251 6252
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $4;
6253 6254
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6255 6256 6257 6258 6259 6260
					/* Ideally we'd mark the FuncCall node to indicate
					 * "must be an aggregate", but there's no provision
					 * for that in FuncCall at the moment.
					 */
					$$ = (Node *)n;
				}
6261
			| func_name '(' DISTINCT expr_list ')'
6262 6263 6264 6265
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $4;
6266 6267
					n->agg_star = FALSE;
					n->agg_distinct = TRUE;
6268 6269
					$$ = (Node *)n;
				}
6270
			| func_name '(' '*' ')'
6271 6272 6273 6274 6275 6276 6277 6278 6279
				{
					/*
					 * For now, we transform AGGREGATE(*) into AGGREGATE(1).
					 *
					 * This does the right thing for COUNT(*) (in fact,
					 * any certainly-non-null expression would do for COUNT),
					 * and there are no other aggregates in SQL92 that accept
					 * '*' as parameter.
					 *
6280 6281 6282
					 * The FuncCall node is also marked agg_star = true,
					 * so that later processing can detect what the argument
					 * really was.
6283 6284 6285 6286 6287 6288 6289
					 */
					FuncCall *n = makeNode(FuncCall);
					A_Const *star = makeNode(A_Const);

					star->val.type = T_Integer;
					star->val.val.ival = 1;
					n->funcname = $1;
6290
					n->args = makeList1(star);
6291 6292
					n->agg_star = TRUE;
					n->agg_distinct = FALSE;
6293 6294
					$$ = (Node *)n;
				}
6295
			| CURRENT_DATE
6296
				{
6297
					/*
6298
					 * Translate as "'now'::text::date".
6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310
					 *
					 * We cannot use "'now'::date" because coerce_type() will
					 * immediately reduce that to a constant representing
					 * today's date.  We need to delay the conversion until
					 * runtime, else the wrong things will happen when
					 * CURRENT_DATE is used in a column default value or rule.
					 *
					 * This could be simplified if we had a way to generate
					 * an expression tree representing runtime application
					 * of type-input conversion functions...
					 */
					A_Const *s = makeNode(A_Const);
6311
					TypeName *d;
6312

6313 6314
					s->val.type = T_String;
					s->val.val.str = "now";
6315
					s->typename = SystemTypeName("text");
6316

6317
					d = SystemTypeName("date");
6318

6319
					$$ = (Node *)makeTypeCast((Node *)s, d);
6320
				}
6321
			| CURRENT_TIME
6322
				{
6323
					/*
6324
					 * Translate as "'now'::text::timetz".
6325 6326 6327
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
6328
					TypeName *d;
6329

6330 6331
					s->val.type = T_String;
					s->val.val.str = "now";
6332
					s->typename = SystemTypeName("text");
6333

6334
					d = SystemTypeName("timetz");
6335 6336 6337 6338 6339 6340
					/* SQL99 mandates a default precision of zero for TIME
					 * fields in schemas. However, for CURRENT_TIME
					 * let's preserve the microsecond precision we
					 * might see from the system clock. - thomas 2001-12-07
					 */
					d->typmod = 6;
6341

6342
					$$ = (Node *)makeTypeCast((Node *)s, d);
6343
				}
6344
			| CURRENT_TIME '(' Iconst ')'
6345
				{
6346
					/*
6347
					 * Translate as "'now'::text::timetz(n)".
6348 6349
					 * See comments for CURRENT_DATE.
					 */
6350
					A_Const *s = makeNode(A_Const);
6351
					TypeName *d;
6352 6353 6354

					s->val.type = T_String;
					s->val.val.str = "now";
6355 6356
					s->typename = SystemTypeName("text");
					d = SystemTypeName("timetz");
6357
					if ($3 < 0)
6358 6359 6360 6361
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("CURRENT_TIME(%d) precision must not be negative",
										$3)));
6362 6363
					if ($3 > MAX_TIME_PRECISION)
					{
6364
						ereport(WARNING,
6365 6366 6367
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("CURRENT_TIME(%d) precision reduced to maximum allowed, %d",
										$3, MAX_TIME_PRECISION)));
6368 6369
						$3 = MAX_TIME_PRECISION;
					}
6370
					d->typmod = $3;
6371

6372
					$$ = (Node *)makeTypeCast((Node *)s, d);
6373
				}
6374
			| CURRENT_TIMESTAMP
6375
				{
6376
					/*
6377
					 * Translate as "'now'::text::timestamptz".
6378 6379 6380
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
6381
					TypeName *d;
6382

6383 6384
					s->val.type = T_String;
					s->val.val.str = "now";
6385
					s->typename = SystemTypeName("text");
6386

6387
					d = SystemTypeName("timestamptz");
6388 6389 6390 6391 6392
					/* SQL99 mandates a default precision of 6 for timestamp.
					 * Also, that is about as precise as we will get since
					 * we are using a microsecond time interface.
					 * - thomas 2001-12-07
					 */
6393
					d->typmod = 6;
6394

6395
					$$ = (Node *)makeTypeCast((Node *)s, d);
6396
				}
6397
			| CURRENT_TIMESTAMP '(' Iconst ')'
6398
				{
6399
					/*
6400
					 * Translate as "'now'::text::timestamptz(n)".
6401 6402
					 * See comments for CURRENT_DATE.
					 */
6403
					A_Const *s = makeNode(A_Const);
6404
					TypeName *d;
6405 6406 6407

					s->val.type = T_String;
					s->val.val.str = "now";
6408
					s->typename = SystemTypeName("text");
6409

6410
					d = SystemTypeName("timestamptz");
6411
					if ($3 < 0)
6412 6413 6414 6415
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("CURRENT_TIMESTAMP(%d) precision must not be negative",
										$3)));
6416 6417
					if ($3 > MAX_TIMESTAMP_PRECISION)
					{
6418
						ereport(WARNING,
6419 6420 6421
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("CURRENT_TIMESTAMP(%d) precision reduced to maximum allowed, %d",
										$3, MAX_TIMESTAMP_PRECISION)));
6422 6423
						$3 = MAX_TIMESTAMP_PRECISION;
					}
6424
					d->typmod = $3;
6425

6426
					$$ = (Node *)makeTypeCast((Node *)s, d);
6427
				}
6428
			| LOCALTIME
6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450
				{
					/*
					 * Translate as "'now'::text::time".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

					s->val.type = T_String;
					s->val.val.str = "now";
					s->typename = SystemTypeName("text");

					d = SystemTypeName("time");
					/* SQL99 mandates a default precision of zero for TIME
					 * fields in schemas. However, for LOCALTIME
					 * let's preserve the microsecond precision we
					 * might see from the system clock. - thomas 2001-12-07
					 */
					d->typmod = 6;

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
6451
			| LOCALTIME '(' Iconst ')'
6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463
				{
					/*
					 * Translate as "'now'::text::time(n)".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

					s->val.type = T_String;
					s->val.val.str = "now";
					s->typename = SystemTypeName("text");
					d = SystemTypeName("time");
6464
					if ($3 < 0)
6465 6466 6467 6468
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("LOCALTIME(%d) precision must not be negative",
										$3)));
6469 6470
					if ($3 > MAX_TIME_PRECISION)
					{
6471
						ereport(WARNING,
6472 6473 6474
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("LOCALTIME(%d) precision reduced to maximum allowed, %d",
										$3, MAX_TIME_PRECISION)));
6475 6476
						$3 = MAX_TIME_PRECISION;
					}
6477 6478 6479 6480
					d->typmod = $3;

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
6481
			| LOCALTIMESTAMP
6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503
				{
					/*
					 * Translate as "'now'::text::timestamp".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

					s->val.type = T_String;
					s->val.val.str = "now";
					s->typename = SystemTypeName("text");

					d = SystemTypeName("timestamp");
					/* SQL99 mandates a default precision of 6 for timestamp.
					 * Also, that is about as precise as we will get since
					 * we are using a microsecond time interface.
					 * - thomas 2001-12-07
					 */
					d->typmod = 6;

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
6504
			| LOCALTIMESTAMP '(' Iconst ')'
6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517
				{
					/*
					 * Translate as "'now'::text::timestamp(n)".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

					s->val.type = T_String;
					s->val.val.str = "now";
					s->typename = SystemTypeName("text");

					d = SystemTypeName("timestamp");
6518
					if ($3 < 0)
6519 6520 6521 6522
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("LOCALTIMESTAMP(%d) precision must not be negative",
										$3)));
6523 6524
					if ($3 > MAX_TIMESTAMP_PRECISION)
					{
6525
						ereport(WARNING,
6526 6527 6528
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("LOCALTIMESTAMP(%d) precision reduced to maximum allowed, %d",
										$3, MAX_TIMESTAMP_PRECISION)));
6529 6530
						$3 = MAX_TIMESTAMP_PRECISION;
					}
6531 6532 6533 6534
					d->typmod = $3;

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
6535
			| CURRENT_USER
6536 6537
				{
					FuncCall *n = makeNode(FuncCall);
6538
					n->funcname = SystemFuncName("current_user");
6539
					n->args = NIL;
6540 6541
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6542 6543
					$$ = (Node *)n;
				}
6544
			| SESSION_USER
6545 6546
				{
					FuncCall *n = makeNode(FuncCall);
6547
					n->funcname = SystemFuncName("session_user");
6548
					n->args = NIL;
6549 6550
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6551 6552
					$$ = (Node *)n;
				}
6553
			| USER
6554 6555
				{
					FuncCall *n = makeNode(FuncCall);
6556
					n->funcname = SystemFuncName("current_user");
6557
					n->args = NIL;
6558 6559
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6560 6561
					$$ = (Node *)n;
				}
6562 6563
			| CAST '(' a_expr AS Typename ')'
				{ $$ = makeTypeCast($3, $5); }
6564
			| EXTRACT '(' extract_list ')'
6565 6566
				{
					FuncCall *n = makeNode(FuncCall);
6567
					n->funcname = SystemFuncName("date_part");
6568
					n->args = $3;
6569 6570
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6571 6572
					$$ = (Node *)n;
				}
6573
			| OVERLAY '(' overlay_list ')'
6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586
				{
					/* overlay(A PLACING B FROM C FOR D) is converted to
					 * substring(A, 1, C-1) || B || substring(A, C+1, C+D)
					 * overlay(A PLACING B FROM C) is converted to
					 * substring(A, 1, C-1) || B || substring(A, C+1, C+char_length(B))
					 */
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("overlay");
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					$$ = (Node *)n;
				}
6587
			| POSITION '(' position_list ')'
6588
				{
6589
					/* position(A in B) is converted to position(B, A) */
6590
					FuncCall *n = makeNode(FuncCall);
6591
					n->funcname = SystemFuncName("position");
6592
					n->args = $3;
6593 6594
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6595 6596
					$$ = (Node *)n;
				}
6597
			| SUBSTRING '(' substr_list ')'
6598
				{
6599
					/* substring(A from B for C) is converted to
6600 6601
					 * substring(A, B, C) - thomas 2000-11-28
					 */
6602
					FuncCall *n = makeNode(FuncCall);
6603
					n->funcname = SystemFuncName("substring");
6604
					n->args = $3;
6605 6606
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6607 6608
					$$ = (Node *)n;
				}
6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624
			| TREAT '(' a_expr AS Typename ')'
				{
					/* TREAT(expr AS target) converts expr of a particular type to target,
					 * which is defined to be a subtype of the original expression.
					 * In SQL99, this is intended for use with structured UDTs,
					 * but let's make this a generally useful form allowing stronger
					 * coersions than are handled by implicit casting.
					 */
					FuncCall *n = makeNode(FuncCall);
					/* Convert SystemTypeName() to SystemFuncName() even though
					 * at the moment they result in the same thing.
					 */
					n->funcname = SystemFuncName(((Value *)llast($5->names))->val.str);
					n->args = makeList1($3);
					$$ = (Node *)n;
				}
6625
			| TRIM '(' BOTH trim_list ')'
6626
				{
6627 6628 6629
					/* various trim expressions are defined in SQL92
					 * - thomas 1997-07-19
					 */
6630
					FuncCall *n = makeNode(FuncCall);
6631
					n->funcname = SystemFuncName("btrim");
6632
					n->args = $4;
6633 6634
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6635 6636
					$$ = (Node *)n;
				}
6637
			| TRIM '(' LEADING trim_list ')'
6638 6639
				{
					FuncCall *n = makeNode(FuncCall);
6640
					n->funcname = SystemFuncName("ltrim");
6641
					n->args = $4;
6642 6643
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6644 6645
					$$ = (Node *)n;
				}
6646
			| TRIM '(' TRAILING trim_list ')'
6647 6648
				{
					FuncCall *n = makeNode(FuncCall);
6649
					n->funcname = SystemFuncName("rtrim");
6650
					n->args = $4;
6651 6652
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6653 6654
					$$ = (Node *)n;
				}
6655
			| TRIM '(' trim_list ')'
6656 6657
				{
					FuncCall *n = makeNode(FuncCall);
6658
					n->funcname = SystemFuncName("btrim");
6659
					n->args = $3;
6660 6661
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
6662 6663
					$$ = (Node *)n;
				}
6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678
			| CONVERT '(' a_expr USING any_name ')'
				{
					FuncCall *n = makeNode(FuncCall);
					A_Const *c = makeNode(A_Const);

					c->val.type = T_String;
					c->val.val.str = NameListToQuotedString($5);

					n->funcname = SystemFuncName("convert_using");
					n->args = makeList2($3, c);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					$$ = (Node *)n;
				}
			| CONVERT '(' expr_list ')'
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6679 6680 6681 6682 6683 6684 6685 6686
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("convert");
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					$$ = (Node *)n;
				}
6687
			| select_with_parens			%prec UMINUS
6688 6689 6690
				{
					SubLink *n = makeNode(SubLink);
					n->subLinkType = EXPR_SUBLINK;
6691 6692
					n->lefthand = NIL;
					n->operName = NIL;
6693
					n->subselect = $1;
6694 6695
					$$ = (Node *)n;
				}
6696
			| EXISTS select_with_parens
6697 6698 6699
				{
					SubLink *n = makeNode(SubLink);
					n->subLinkType = EXISTS_SUBLINK;
6700 6701
					n->lefthand = NIL;
					n->operName = NIL;
6702
					n->subselect = $2;
6703 6704
					$$ = (Node *)n;
				}
6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715
			| ARRAY select_with_parens
				{
					SubLink *n = makeNode(SubLink);
					n->subLinkType = ARRAY_SUBLINK;
					n->lefthand = NIL;
					n->operName = NIL;
					n->subselect = $2;
					$$ = (Node *)n;
				}
			| ARRAY array_expr
				{	$$ = $2;	}
6716 6717
		;

6718 6719 6720 6721
/*
 * Supporting nonterminals for expressions.
 */

6722 6723
opt_indirection:
			opt_indirection '[' a_expr ']'
6724 6725 6726
				{
					A_Indices *ai = makeNode(A_Indices);
					ai->lidx = NULL;
6727 6728
					ai->uidx = $3;
					$$ = lappend($1, ai);
6729
				}
6730
			| opt_indirection '[' a_expr ':' a_expr ']'
6731 6732
				{
					A_Indices *ai = makeNode(A_Indices);
6733 6734 6735
					ai->lidx = $3;
					ai->uidx = $5;
					$$ = lappend($1, ai);
6736
				}
6737 6738
			| /*EMPTY*/
				{ $$ = NIL; }
6739
		;
6740

6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752
expr_list:	a_expr
				{
					FastList *dst = (FastList *) &$$;
					makeFastList1(dst, $1);
				}
			| expr_list ',' a_expr
				{
					FastList *dst = (FastList *) &$$;
					FastList *src = (FastList *) &$1;
					*dst = *src;
					FastAppend(dst, $3);
				}
6753
		;
6754

6755 6756
extract_list:
			extract_arg FROM a_expr
6757 6758 6759 6760
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = $1;
6761
					$$ = makeList2((Node *) n, $3);
6762
				}
6763
			| /*EMPTY*/								{ $$ = NIL; }
6764
		;
6765

6766 6767 6768 6769 6770 6771 6772 6773 6774 6775
type_list:  type_list ',' Typename
				{
					$$ = lappend($1, $3);
				}
			| Typename
				{
					$$ = makeList1($1);
				}
		;

6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795
array_expr_list: array_expr
				{	$$ = makeList1($1);		}
			| array_expr_list ',' array_expr
				{	$$ = lappend($1, $3);	}
		;

array_expr: '[' expr_list ']'
				{
					ArrayExpr *n = makeNode(ArrayExpr);
					n->elements = $2;
					$$ = (Node *)n;
				}
			| '[' array_expr_list ']'
				{
					ArrayExpr *n = makeNode(ArrayExpr);
					n->elements = $2;
					$$ = (Node *)n;
				}
		;

6796 6797 6798 6799
/* Allow delimited string SCONST in extract_arg as an SQL extension.
 * - thomas 2001-04-12
 */

6800 6801 6802 6803 6804 6805 6806 6807 6808
extract_arg:
			IDENT									{ $$ = $1; }
			| YEAR_P								{ $$ = "year"; }
			| MONTH_P								{ $$ = "month"; }
			| DAY_P									{ $$ = "day"; }
			| HOUR_P								{ $$ = "hour"; }
			| MINUTE_P								{ $$ = "minute"; }
			| SECOND_P								{ $$ = "second"; }
			| SCONST								{ $$ = $1; }
6809 6810
		;

6811 6812 6813 6814 6815
/* OVERLAY() arguments
 * SQL99 defines the OVERLAY() function:
 * o overlay(text placing text from int for int)
 * o overlay(text placing text from int)
 */
6816 6817
overlay_list:
			a_expr overlay_placing substr_from substr_for
6818 6819 6820
				{
					$$ = makeList4($1, $2, $3, $4);
				}
6821
			| a_expr overlay_placing substr_from
6822 6823 6824 6825 6826
				{
					$$ = makeList3($1, $2, $3);
				}
		;

6827 6828 6829
overlay_placing:
			PLACING a_expr
				{ $$ = $2; }
6830 6831
		;

6832 6833
/* position_list uses b_expr not a_expr to avoid conflict with general IN */

6834 6835 6836
position_list:
			b_expr IN_P b_expr						{ $$ = makeList2($3, $1); }
			| /*EMPTY*/								{ $$ = NIL; }
6837
		;
6838

6839 6840 6841 6842
/* SUBSTRING() arguments
 * SQL9x defines a specific syntax for arguments to SUBSTRING():
 * o substring(text from int for int)
 * o substring(text from int) get entire string from starting point "int"
6843
 * o substring(text from pattern) get entire string matching pattern
6844 6845 6846 6847 6848 6849
 * o substring(text for int) get first "int" characters of string
 * We also want to implement generic substring functions which accept
 * the usual generic list of arguments. So we will accept both styles
 * here, and convert the SQL9x style to the generic list for further
 * processing. - thomas 2000-11-28
 */
6850 6851
substr_list:
			a_expr substr_from substr_for
6852
				{
6853
					$$ = makeList3($1, $2, $3);
6854
				}
6855
			| a_expr substr_for substr_from
6856 6857 6858
				{
					$$ = makeList3($1, $3, $2);
				}
6859
			| a_expr substr_from
6860 6861 6862
				{
					$$ = makeList2($1, $2);
				}
6863
			| a_expr substr_for
6864 6865 6866 6867
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Integer;
					n->val.val.ival = 1;
6868 6869
					$$ = makeList3($1, (Node *)n, $2);
				}
6870
			| expr_list
6871 6872
				{
					$$ = $1;
6873
				}
6874 6875
			| /*EMPTY*/
				{ $$ = NIL; }
6876
		;
6877

6878 6879
substr_from:
			FROM a_expr								{ $$ = $2; }
6880 6881
		;

6882
substr_for: FOR a_expr								{ $$ = $2; }
6883
		;
6884

6885 6886 6887
trim_list:	a_expr FROM expr_list					{ $$ = lappend($3, $1); }
			| FROM expr_list						{ $$ = $2; }
			| expr_list								{ $$ = $1; }
6888
		;
6889

6890
in_expr:	select_with_parens
6891
				{
6892 6893
					SubLink *n = makeNode(SubLink);
					n->subselect = $1;
6894
					/* other fields will be filled later */
6895
					$$ = (Node *)n;
6896
				}
6897
			| '(' expr_list ')'						{ $$ = (Node *)$2; }
6898
		;
6899

6900 6901 6902 6903
/* Case clause
 * Define SQL92-style case clause.
 * Allow all four forms described in the standard:
 * - Full specification
6904
 *	CASE WHEN a = b THEN c ... ELSE d END
6905
 * - Implicit argument
6906
 *	CASE a WHEN b THEN c ... ELSE d END
6907
 * - Conditional NULL
6908 6909
 *	NULLIF(x,y)
 *	same as CASE WHEN x = y THEN NULL ELSE x END
6910
 * - Conditional substitution from list, use first non-null argument
6911
 *	COALESCE(a,b,...)
6912 6913
 * same as CASE WHEN a IS NOT NULL THEN a WHEN b IS NOT NULL THEN b ... END
 * - thomas 1998-11-09
6914 6915 6916 6917
 * 
 * NULLIF and COALESCE have become first class nodes to
 * prevent double evaluation of arguments.
 * - Kris Jurka 2003-02-11
6918
 */
6919
case_expr:	CASE case_arg when_clause_list case_default END_P
6920 6921
				{
					CaseExpr *c = makeNode(CaseExpr);
6922
					c->arg = (Expr *) $2;
6923
					c->args = $3;
6924
					c->defresult = (Expr *) $4;
6925 6926
					$$ = (Node *)c;
				}
6927
			| NULLIF '(' a_expr ',' a_expr ')'
6928
				{
6929
					$$ = (Node *) makeSimpleA_Expr(AEXPR_NULLIF, "=", $3, $5);
6930
				}
6931
			| COALESCE '(' expr_list ')'
6932
				{
6933 6934
					CoalesceExpr *c = makeNode(CoalesceExpr);
					c->args = $3;
6935 6936 6937 6938
					$$ = (Node *)c;
				}
		;

6939
when_clause_list:
6940 6941 6942
			/* There must be at least one */
			when_clause								{ $$ = makeList1($1); }
			| when_clause_list when_clause			{ $$ = lappend($1, $2); }
6943 6944
		;

6945 6946
when_clause:
			WHEN a_expr THEN a_expr
6947 6948
				{
					CaseWhen *w = makeNode(CaseWhen);
6949 6950
					w->expr = (Expr *) $2;
					w->result = (Expr *) $4;
6951 6952 6953 6954
					$$ = (Node *)w;
				}
		;

6955 6956 6957
case_default:
			ELSE a_expr								{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NULL; }
6958 6959
		;

6960 6961
case_arg:	a_expr									{ $$ = $1; }
			| /*EMPTY*/								{ $$ = NULL; }
6962 6963
		;

6964 6965
/*
 * columnref starts with relation_name not ColId, so that OLD and NEW
6966
 * references can be accepted.	Note that when there are more than two
6967 6968
 * dotted names, the first name is not actually a relation name...
 */
6969
columnref:	relation_name opt_indirection
6970
				{
6971 6972 6973
					$$ = makeNode(ColumnRef);
					$$->fields = makeList1(makeString($1));
					$$->indirection = $2;
6974
				}
6975
			| dotted_name opt_indirection
6976
				{
6977
					$$ = makeNode(ColumnRef);
6978 6979
					$$->fields = $1;
					$$->indirection = $2;
6980 6981 6982
				}
		;

6983
dotted_name:
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6984 6985
			relation_name attrs
					{ $$ = lcons(makeString($1), $2); }
6986 6987
		;

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6988 6989 6990 6991 6992 6993
attrs:		'.' attr_name
					{ $$ = makeList1(makeString($2)); }
			| '.' '*'
					{ $$ = makeList1(makeString("*")); }
			| '.' attr_name attrs
					{ $$ = lcons(makeString($2), $3); }
6994 6995
		;

6996 6997 6998

/*****************************************************************************
 *
6999
 *	target lists
7000 7001 7002
 *
 *****************************************************************************/

7003
/* Target lists as found in SELECT ... and INSERT VALUES ( ... ) */
7004

7005
target_list:
7006 7007
			target_el								{ $$ = makeList1($1); }
			| target_list ',' target_el				{ $$ = lappend($1, $3); }
7008
		;
7009 7010

/* AS is not optional because shift/red conflict with unary ops */
7011
target_el:	a_expr AS ColLabel
7012 7013 7014
				{
					$$ = makeNode(ResTarget);
					$$->name = $3;
7015
					$$->indirection = NIL;
7016 7017
					$$->val = (Node *)$1;
				}
7018
			| a_expr
7019 7020 7021
				{
					$$ = makeNode(ResTarget);
					$$->name = NULL;
7022
					$$->indirection = NIL;
7023 7024
					$$->val = (Node *)$1;
				}
7025
			| '*'
7026
				{
7027 7028 7029
					ColumnRef *n = makeNode(ColumnRef);
					n->fields = makeList1(makeString("*"));
					n->indirection = NIL;
7030 7031
					$$ = makeNode(ResTarget);
					$$->name = NULL;
7032 7033
					$$->indirection = NIL;
					$$->val = (Node *)n;
7034 7035 7036
				}
		;

7037 7038 7039 7040 7041 7042
/* Target list as found in UPDATE table SET ...
| '(' row_ ')' = '(' row_ ')'
{
	$$ = NULL;
}
 */
7043
update_target_list:
7044 7045
			update_target_el						{ $$ = makeList1($1); }
			| update_target_list ',' update_target_el { $$ = lappend($1,$3); }
7046 7047
		;

7048 7049
update_target_el:
			ColId opt_indirection '=' a_expr
7050 7051 7052 7053
				{
					$$ = makeNode(ResTarget);
					$$->name = $1;
					$$->indirection = $2;
7054
					$$->val = (Node *) $4;
7055
				}
7056 7057 7058 7059
			| ColId opt_indirection '=' DEFAULT
				{
					$$ = makeNode(ResTarget);
					$$->name = $1;
7060 7061
					$$->indirection = $2;
					$$->val = (Node *) makeNode(SetToDefault);
7062 7063
				}

7064 7065
		;

7066
insert_target_list:
7067 7068
			insert_target_el						{ $$ = makeList1($1); }
			| insert_target_list ',' insert_target_el { $$ = lappend($1, $3); }
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Bruce Momjian committed
7069 7070
		;

7071 7072 7073 7074 7075 7076
insert_target_el:
			target_el								{ $$ = $1; }
			| DEFAULT
				{
					$$ = makeNode(ResTarget);
					$$->name = NULL;
7077 7078
					$$->indirection = NIL;
					$$->val = (Node *) makeNode(SetToDefault);
7079 7080
				}
		;
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7081 7082


7083 7084 7085 7086 7087 7088
/*****************************************************************************
 *
 *	Names and constants
 *
 *****************************************************************************/

7089 7090 7091
relation_name:
			SpecialRuleRelation						{ $$ = $1; }
			| ColId									{ $$ = $1; }
7092
		;
7093

7094 7095 7096
qualified_name_list:
			qualified_name							{ $$ = makeList1($1); }
			| qualified_name_list ',' qualified_name { $$ = lappend($1, $3); }
7097 7098
		;

7099 7100
qualified_name:
			relation_name
7101 7102 7103 7104 7105 7106
				{
					$$ = makeNode(RangeVar);
					$$->catalogname = NULL;
					$$->schemaname = NULL;
					$$->relname = $1;
				}
7107
			| dotted_name
7108 7109
				{
					$$ = makeNode(RangeVar);
7110 7111 7112 7113 7114 7115 7116 7117 7118 7119
					switch (length($1))
					{
						case 2:
							$$->catalogname = NULL;
							$$->schemaname = strVal(lfirst($1));
							$$->relname = strVal(lsecond($1));
							break;
						case 3:
							$$->catalogname = strVal(lfirst($1));
							$$->schemaname = strVal(lsecond($1));
7120
							$$->relname = strVal(lthird($1));
7121 7122
							break;
						default:
7123 7124 7125 7126
							ereport(ERROR,
									(errcode(ERRCODE_SYNTAX_ERROR),
									 errmsg("improper qualified name (too many dotted names): %s",
											NameListToString($1))));
7127 7128
							break;
					}
7129 7130 7131
				}
		;

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7132 7133 7134 7135
name_list:	name
					{ $$ = makeList1(makeString($1)); }
			| name_list ',' name
					{ $$ = lappend($1, makeString($3)); }
7136 7137
		;

7138

7139
name:		ColId									{ $$ = $1; };
7140

7141 7142 7143 7144 7145 7146 7147 7148 7149 7150 7151 7152
database_name:
			ColId									{ $$ = $1; };

access_method:
			ColId									{ $$ = $1; };

attr_name:	ColId									{ $$ = $1; };

index_name: ColId									{ $$ = $1; };

file_name:	Sconst									{ $$ = $1; };

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7153 7154
func_name:	function_name
					{ $$ = makeList1(makeString($1)); }
7155
			| dotted_name							{ $$ = $1; }
7156 7157 7158
		;


7159 7160
/*
 * Constants
7161
 */
7162
AexprConst: Iconst
7163 7164 7165 7166 7167 7168
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Integer;
					n->val.val.ival = $1;
					$$ = (Node *)n;
				}
7169
			| FCONST
7170 7171 7172
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Float;
7173
					n->val.val.str = $1;
7174 7175
					$$ = (Node *)n;
				}
7176
			| Sconst
7177 7178 7179 7180 7181 7182
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = $1;
					$$ = (Node *)n;
				}
7183
			| BCONST
7184 7185 7186 7187 7188 7189
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_BitString;
					n->val.val.str = $1;
					$$ = (Node *)n;
				}
7190 7191 7192 7193 7194 7195 7196 7197 7198 7199 7200 7201
			| XCONST
				{
					/* This is a bit constant per SQL99:
					 * Without Feature F511, "BIT data type",
					 * a <general literal> shall not be a
					 * <bit string literal> or a <hex string literal>.
					 */
					A_Const *n = makeNode(A_Const);
					n->val.type = T_BitString;
					n->val.val.str = $1;
					$$ = (Node *)n;
				}
7202
			| ConstTypename Sconst
7203 7204 7205 7206 7207 7208 7209
				{
					A_Const *n = makeNode(A_Const);
					n->typename = $1;
					n->val.type = T_String;
					n->val.val.str = $2;
					$$ = (Node *)n;
				}
7210
			| ConstInterval Sconst opt_interval
7211 7212 7213 7214 7215
				{
					A_Const *n = makeNode(A_Const);
					n->typename = $1;
					n->val.type = T_String;
					n->val.val.str = $2;
7216
					/* precision is not specified, but fields may be... */
7217 7218
					if ($3 != INTERVAL_FULL_RANGE)
						n->typename->typmod = INTERVAL_TYPMOD(INTERVAL_FULL_PRECISION, $3);
7219 7220
					$$ = (Node *)n;
				}
7221
			| ConstInterval '(' Iconst ')' Sconst opt_interval
7222 7223 7224 7225 7226
				{
					A_Const *n = makeNode(A_Const);
					n->typename = $1;
					n->val.type = T_String;
					n->val.val.str = $5;
7227
					/* precision specified, and fields may be... */
7228
					if ($3 < 0)
7229 7230 7231 7232
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision must not be negative",
										$3)));
7233 7234
					if ($3 > MAX_INTERVAL_PRECISION)
					{
7235
						ereport(WARNING,
7236 7237 7238
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision reduced to maximum allowed, %d",
										$3, MAX_INTERVAL_PRECISION)));
7239 7240
						$3 = MAX_INTERVAL_PRECISION;
					}
7241
					n->typename->typmod = INTERVAL_TYPMOD($3, $6);
7242 7243
					$$ = (Node *)n;
				}
7244
			| PARAM opt_indirection
7245 7246 7247 7248 7249 7250 7251
				{
					ParamRef *n = makeNode(ParamRef);
					n->number = $1;
					n->fields = NIL;
					n->indirection = $2;
					$$ = (Node *)n;
				}
7252
			| TRUE_P
7253
				{
7254
					$$ = (Node *)makeBoolConst(TRUE);
7255
				}
7256
			| FALSE_P
7257
				{
7258
					$$ = (Node *)makeBoolConst(FALSE);
7259
				}
7260
			| NULL_P
7261 7262 7263 7264 7265
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Null;
					$$ = (Node *)n;
				}
7266
		;
7267

7268 7269 7270
Iconst:		ICONST									{ $$ = $1; };
Sconst:		SCONST									{ $$ = $1; };
UserId:		ColId									{ $$ = $1; };
7271

7272 7273 7274 7275 7276
/*
 * Name classification hierarchy.
 *
 * IDENT is the lexeme returned by the lexer for identifiers that match
 * no known keyword.  In most cases, we can accept certain keywords as
7277
 * names, not only IDENTs.	We prefer to accept as many such keywords
7278 7279 7280 7281 7282 7283 7284
 * as possible to minimize the impact of "reserved words" on programmers.
 * So, we divide names into several possible classes.  The classification
 * is chosen in part to make keywords acceptable as names wherever possible.
 */

/* Column identifier --- names that can be column, table, etc names.
 */
7285 7286 7287
ColId:		IDENT									{ $$ = $1; }
			| unreserved_keyword					{ $$ = pstrdup($1); }
			| col_name_keyword						{ $$ = pstrdup($1); }
7288 7289 7290 7291
		;

/* Type identifier --- names that can be type names.
 */
7292 7293
type_name:	IDENT									{ $$ = $1; }
			| unreserved_keyword					{ $$ = pstrdup($1); }
7294 7295 7296 7297
		;

/* Function identifier --- names that can be function names.
 */
7298 7299 7300 7301
function_name:
			IDENT									{ $$ = $1; }
			| unreserved_keyword					{ $$ = pstrdup($1); }
			| func_name_keyword						{ $$ = pstrdup($1); }
7302 7303 7304 7305 7306
		;

/* Column label --- allowed labels in "AS" clauses.
 * This presently includes *all* Postgres keywords.
 */
7307 7308 7309 7310 7311
ColLabel:	IDENT									{ $$ = $1; }
			| unreserved_keyword					{ $$ = pstrdup($1); }
			| col_name_keyword						{ $$ = pstrdup($1); }
			| func_name_keyword						{ $$ = pstrdup($1); }
			| reserved_keyword						{ $$ = pstrdup($1); }
7312 7313 7314
		;


7315 7316
/*
 * Keyword classification lists.  Generally, every keyword present in
7317
 * the Postgres grammar should appear in exactly one of these lists.
7318
 *
7319 7320 7321
 * Put a new keyword into the first list that it can go into without causing
 * shift or reduce conflicts.  The earlier lists define "less reserved"
 * categories of keywords.
7322
 */
7323

7324
/* "Unreserved" keywords --- available for use as any kind of name.
7325
 */
7326
unreserved_keyword:
7327
			  ABORT_P
7328
			| ABSOLUTE_P
7329 7330 7331 7332 7333 7334 7335
			| ACCESS
			| ACTION
			| ADD
			| AFTER
			| AGGREGATE
			| ALTER
			| ASSERTION
7336
			| ASSIGNMENT
7337 7338 7339
			| AT
			| BACKWARD
			| BEFORE
7340
			| BEGIN_P
7341 7342 7343 7344 7345 7346 7347
			| BY
			| CACHE
			| CALLED
			| CASCADE
			| CHAIN
			| CHARACTERISTICS
			| CHECKPOINT
7348
			| CLASS
7349 7350 7351 7352 7353 7354
			| CLOSE
			| CLUSTER
			| COMMENT
			| COMMIT
			| COMMITTED
			| CONSTRAINTS
7355
			| CONVERSION_P
7356 7357 7358 7359 7360 7361 7362
			| COPY
			| CREATEDB
			| CREATEUSER
			| CURSOR
			| CYCLE
			| DATABASE
			| DAY_P
7363
			| DEALLOCATE
7364
			| DECLARE
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7365
			| DEFAULTS
7366 7367 7368
			| DEFERRED
			| DEFINER
			| DELETE_P
7369
			| DELIMITER
7370 7371
			| DELIMITERS
			| DOMAIN_P
7372
			| DOUBLE_P
7373 7374 7375 7376 7377
			| DROP
			| EACH
			| ENCODING
			| ENCRYPTED
			| ESCAPE
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7378
			| EXCLUDING
7379 7380 7381 7382 7383
			| EXCLUSIVE
			| EXECUTE
			| EXPLAIN
			| EXTERNAL
			| FETCH
7384
			| FIRST_P
7385 7386 7387 7388 7389
			| FORCE
			| FORWARD
			| FUNCTION
			| GLOBAL
			| HANDLER
7390
			| HOLD
7391 7392 7393
			| HOUR_P
			| IMMEDIATE
			| IMMUTABLE
7394
			| IMPLICIT_P
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7395
			| INCLUDING
7396 7397 7398 7399
			| INCREMENT
			| INDEX
			| INHERITS
			| INOUT
7400
			| INPUT_P
7401 7402 7403 7404 7405 7406 7407
			| INSENSITIVE
			| INSERT
			| INSTEAD
			| INVOKER
			| ISOLATION
			| KEY
			| LANCOMPILER
7408
			| LANGUAGE
7409
			| LARGE_P
7410
			| LAST_P
7411 7412 7413 7414 7415 7416 7417 7418 7419 7420 7421 7422 7423 7424 7425 7426 7427 7428 7429 7430 7431
			| LEVEL
			| LISTEN
			| LOAD
			| LOCAL
			| LOCATION
			| LOCK_P
			| MATCH
			| MAXVALUE
			| MINUTE_P
			| MINVALUE
			| MODE
			| MONTH_P
			| MOVE
			| NAMES
			| NATIONAL
			| NEXT
			| NO
			| NOCREATEDB
			| NOCREATEUSER
			| NOTHING
			| NOTIFY
7432
			| OBJECT_P
7433 7434 7435 7436 7437 7438 7439 7440 7441 7442 7443
			| OF
			| OIDS
			| OPERATOR
			| OPTION
			| OUT_P
			| OWNER
			| PARTIAL
			| PASSWORD
			| PATH_P
			| PENDANT
			| PRECISION
7444
			| PREPARE
7445
			| PRESERVE
7446 7447 7448 7449 7450
			| PRIOR
			| PRIVILEGES
			| PROCEDURAL
			| PROCEDURE
			| READ
7451
			| RECHECK
7452
			| REINDEX
7453
			| RELATIVE_P
7454
			| RENAME
7455
			| REPEATABLE
7456 7457
			| REPLACE
			| RESET
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7458
			| RESTART
7459 7460 7461 7462
			| RESTRICT
			| RETURNS
			| REVOKE
			| ROLLBACK
7463
			| ROWS
7464 7465 7466 7467 7468 7469 7470
			| RULE
			| SCHEMA
			| SCROLL
			| SECOND_P
			| SECURITY
			| SEQUENCE
			| SERIALIZABLE
7471
			| SESSION
7472 7473 7474
			| SET
			| SHARE
			| SHOW
7475
			| SIMPLE
7476 7477 7478 7479 7480 7481 7482 7483
			| STABLE
			| START
			| STATEMENT
			| STATISTICS
			| STDIN
			| STDOUT
			| STORAGE
			| SYSID
7484
			| STRICT_P
7485 7486 7487 7488 7489 7490 7491 7492 7493
			| TEMP
			| TEMPLATE
			| TEMPORARY
			| TOAST
			| TRANSACTION
			| TRIGGER
			| TRUNCATE
			| TRUSTED
			| TYPE_P
7494
			| UNCOMMITTED
7495 7496 7497 7498 7499 7500 7501 7502 7503 7504 7505 7506 7507 7508 7509 7510 7511
			| UNENCRYPTED
			| UNKNOWN
			| UNLISTEN
			| UNTIL
			| UPDATE
			| USAGE
			| VACUUM
			| VALID
			| VALIDATOR
			| VALUES
			| VARYING
			| VERSION
			| VIEW
			| VOLATILE
			| WITH
			| WITHOUT
			| WORK
7512
			| WRITE
7513 7514
			| YEAR_P
			| ZONE
7515 7516
		;

7517
/* Column identifier --- keywords that can be column, table, etc names.
7518
 *
7519 7520 7521
 * Many of these keywords will in fact be recognized as type or function
 * names too; but they have special productions for the purpose, and so
 * can't be treated as "generic" type or function names.
7522
 *
7523 7524 7525
 * The type names appearing here are not usable as function names
 * because they can be followed by '(' in typename productions, which
 * looks too much like a function call for an LR(1) parser.
7526
 */
7527
col_name_keyword:
7528 7529
			  BIGINT
			| BIT
7530
			| BOOLEAN_P
7531 7532 7533
			| CHAR_P
			| CHARACTER
			| COALESCE
7534
			| CONVERT
7535
			| DEC
7536
			| DECIMAL_P
7537 7538 7539
			| EXISTS
			| EXTRACT
			| FLOAT_P
7540
			| INT_P
7541 7542 7543 7544 7545 7546 7547 7548 7549
			| INTEGER
			| INTERVAL
			| NCHAR
			| NONE
			| NULLIF
			| NUMERIC
			| OVERLAY
			| POSITION
			| REAL
7550
			| ROW
7551 7552 7553 7554 7555
			| SETOF
			| SMALLINT
			| SUBSTRING
			| TIME
			| TIMESTAMP
7556
			| TREAT
7557 7558
			| TRIM
			| VARCHAR
7559 7560
		;

7561 7562 7563 7564 7565 7566 7567 7568
/* Function identifier --- keywords that can be function names.
 *
 * Most of these are keywords that are used as operators in expressions;
 * in general such keywords can't be column names because they would be
 * ambiguous with variables, but they are unambiguous as function identifiers.
 *
 * Do not include POSITION, SUBSTRING, etc here since they have explicit
 * productions in a_expr to support the goofy SQL9x argument syntax.
7569
 * - thomas 2000-11-28
7570 7571
 */
func_name_keyword:
7572 7573 7574 7575 7576 7577 7578 7579 7580 7581 7582 7583 7584 7585 7586 7587 7588 7589 7590 7591 7592
			  AUTHORIZATION
			| BETWEEN
			| BINARY
			| CROSS
			| FREEZE
			| FULL
			| ILIKE
			| IN_P
			| INNER_P
			| IS
			| ISNULL
			| JOIN
			| LEFT
			| LIKE
			| NATURAL
			| NOTNULL
			| OUTER_P
			| OVERLAPS
			| RIGHT
			| SIMILAR
			| VERBOSE
7593 7594 7595
		;

/* Reserved keyword --- these keywords are usable only as a ColLabel.
7596 7597
 *
 * Keywords appear here if they could not be distinguished from variable,
7598 7599
 * type, or function names in some contexts.  Don't put things here unless
 * forced to.
7600
 */
7601
reserved_keyword:
7602 7603 7604 7605 7606
			  ALL
			| ANALYSE
			| ANALYZE
			| AND
			| ANY
7607
			| ARRAY
7608 7609 7610 7611 7612 7613 7614 7615 7616 7617 7618 7619 7620 7621 7622 7623 7624 7625 7626 7627
			| AS
			| ASC
			| BOTH
			| CASE
			| CAST
			| CHECK
			| COLLATE
			| COLUMN
			| CONSTRAINT
			| CREATE
			| CURRENT_DATE
			| CURRENT_TIME
			| CURRENT_TIMESTAMP
			| CURRENT_USER
			| DEFAULT
			| DEFERRABLE
			| DESC
			| DISTINCT
			| DO
			| ELSE
7628
			| END_P
7629 7630 7631 7632 7633 7634 7635 7636 7637 7638 7639 7640 7641 7642 7643 7644 7645 7646 7647 7648 7649 7650 7651 7652 7653 7654 7655 7656 7657 7658 7659 7660 7661 7662 7663 7664 7665 7666 7667 7668 7669 7670 7671 7672 7673 7674 7675
			| EXCEPT
			| FALSE_P
			| FOR
			| FOREIGN
			| FROM
			| GRANT
			| GROUP_P
			| HAVING
			| INITIALLY
			| INTERSECT
			| INTO
			| LEADING
			| LIMIT
			| LOCALTIME
			| LOCALTIMESTAMP
			| NEW
			| NOT
			| NULL_P
			| OFF
			| OFFSET
			| OLD
			| ON
			| ONLY
			| OR
			| ORDER
			| PLACING
			| PRIMARY
			| REFERENCES
			| SELECT
			| SESSION_USER
			| SOME
			| TABLE
			| THEN
			| TO
			| TRAILING
			| TRUE_P
			| UNION
			| UNIQUE
			| USER
			| USING
			| WHEN
			| WHERE
		;


SpecialRuleRelation:
			OLD
7676 7677
				{
					if (QueryIsRule)
7678
						$$ = "*OLD*";
7679
					else
7680 7681
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
7682
								 errmsg("OLD used in query that is not in a rule")));
7683
				}
7684
			| NEW
7685 7686 7687 7688
				{
					if (QueryIsRule)
						$$ = "*NEW*";
					else
7689 7690
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
7691
								 errmsg("NEW used in query that is not in a rule")));
7692 7693
				}
		;
7694 7695 7696

%%

7697 7698 7699 7700
static Node *
makeTypeCast(Node *arg, TypeName *typename)
{
	/*
7701 7702 7703 7704
	 * Simply generate a TypeCast node.
	 *
	 * Earlier we would determine whether an A_Const would
	 * be acceptable, however Domains require coerce_type()
7705
	 * to process them -- applying constraints as required.
7706
	 */
7707 7708 7709 7710
	TypeCast *n = makeNode(TypeCast);
	n->arg = arg;
	n->typename = typename;
	return (Node *) n;
7711 7712
}

7713 7714 7715 7716
static Node *
makeStringConst(char *str, TypeName *typename)
{
	A_Const *n = makeNode(A_Const);
7717

7718 7719 7720 7721 7722 7723 7724
	n->val.type = T_String;
	n->val.val.str = str;
	n->typename = typename;

	return (Node *)n;
}

7725 7726 7727 7728 7729 7730
static Node *
makeIntConst(int val)
{
	A_Const *n = makeNode(A_Const);
	n->val.type = T_Integer;
	n->val.val.ival = val;
7731
	n->typename = SystemTypeName("int4");
7732 7733 7734 7735

	return (Node *)n;
}

7736 7737 7738 7739
static Node *
makeFloatConst(char *str)
{
	A_Const *n = makeNode(A_Const);
7740

7741 7742
	n->val.type = T_Float;
	n->val.val.str = str;
7743
	n->typename = SystemTypeName("float8");
7744 7745 7746 7747

	return (Node *)n;
}

7748 7749 7750 7751 7752 7753 7754 7755 7756 7757 7758 7759 7760 7761 7762 7763 7764 7765 7766 7767 7768 7769 7770 7771
static Node *
makeAConst(Value *v)
{
	Node *n;

	switch (v->type)
	{
		case T_Float:
			n = makeFloatConst(v->val.str);
			break;

		case T_Integer:
			n = makeIntConst(v->val.ival);
			break;

		case T_String:
		default:
			n = makeStringConst(v->val.str, NULL);
			break;
	}

	return n;
}

7772 7773 7774 7775 7776 7777 7778 7779 7780 7781 7782 7783 7784
/* makeDefElem()
 * Create a DefElem node and set contents.
 * Could be moved to nodes/makefuncs.c if this is useful elsewhere.
 */
static DefElem *
makeDefElem(char *name, Node *arg)
{
	DefElem *f = makeNode(DefElem);
	f->defname = name;
	f->arg = arg;
	return f;
}

7785 7786 7787 7788 7789 7790 7791 7792 7793 7794 7795 7796 7797
/* makeBoolConst()
 * Create an A_Const node and initialize to a boolean constant.
 */
static A_Const *
makeBoolConst(bool state)
{
	A_Const *n = makeNode(A_Const);
	n->val.type = T_String;
	n->val.val.str = (state? "t": "f");
	n->typename = SystemTypeName("bool");
	return n;
}

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/* makeRowExpr()
 * Generate separate operator nodes for a single row descriptor expression.
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 * Perhaps this should go deeper in the parser someday...
 * - thomas 1997-12-22
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 */
static Node *
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makeRowExpr(List *opr, List *largs, List *rargs)
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{
	Node *expr = NULL;
	Node *larg, *rarg;
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	char *oprname;
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	if (length(largs) != length(rargs))
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		ereport(ERROR,
				(errcode(ERRCODE_SYNTAX_ERROR),
				 errmsg("unequal number of entries in row expression")));
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	if (lnext(largs) != NIL)
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		expr = makeRowExpr(opr, lnext(largs), lnext(rargs));
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	larg = lfirst(largs);
	rarg = lfirst(rargs);

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	oprname = strVal(llast(opr));

	if ((strcmp(oprname, "=") == 0) ||
		(strcmp(oprname, "<") == 0) ||
		(strcmp(oprname, "<=") == 0) ||
		(strcmp(oprname, ">") == 0) ||
		(strcmp(oprname, ">=") == 0))
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	{
		if (expr == NULL)
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			expr = (Node *) makeA_Expr(AEXPR_OP, opr, larg, rarg);
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		else
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			expr = (Node *) makeA_Expr(AEXPR_AND, NIL, expr,
									   (Node *) makeA_Expr(AEXPR_OP, opr,
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														   larg, rarg));
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	}
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	else if (strcmp(oprname, "<>") == 0)
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	{
		if (expr == NULL)
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			expr = (Node *) makeA_Expr(AEXPR_OP, opr, larg, rarg);
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		else
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			expr = (Node *) makeA_Expr(AEXPR_OR, NIL, expr,
									   (Node *) makeA_Expr(AEXPR_OP, opr,
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														   larg, rarg));
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	}
	else
	{
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		ereport(ERROR,
				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
				 errmsg("operator %s is not supported for row expressions",
						oprname)));
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	}

	return expr;
}

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/* makeDistinctExpr()
 * Generate separate operator nodes for a single row descriptor expression.
 * Same comments as for makeRowExpr().
 */
static Node *
makeDistinctExpr(List *largs, List *rargs)
{
	Node *expr = NULL;
	Node *larg, *rarg;

	if (length(largs) != length(rargs))
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		ereport(ERROR,
				(errcode(ERRCODE_SYNTAX_ERROR),
				 errmsg("unequal number of entries in row expression")));
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	if (lnext(largs) != NIL)
		expr = makeDistinctExpr(lnext(largs), lnext(rargs));

	larg = lfirst(largs);
	rarg = lfirst(rargs);

	if (expr == NULL)
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		expr = (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=", larg, rarg);
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	else
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		expr = (Node *) makeA_Expr(AEXPR_OR, NIL, expr,
								   (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=",
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															 larg, rarg));

	return expr;
}

/* makeRowNullTest()
 * Generate separate operator nodes for a single row descriptor test.
 */
static Node *
makeRowNullTest(NullTestType test, List *args)
{
	Node *expr = NULL;
	NullTest *n;

	if (lnext(args) != NIL)
		expr = makeRowNullTest(test, lnext(args));

	n = makeNode(NullTest);
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	n->arg = (Expr *) lfirst(args);
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	n->nulltesttype = test;

	if (expr == NULL)
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		expr = (Node *) n;
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	else if (test == IS_NOT_NULL)
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		expr = (Node *) makeA_Expr(AEXPR_OR, NIL, expr, (Node *)n);
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	else
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		expr = (Node *) makeA_Expr(AEXPR_AND, NIL, expr, (Node *)n);
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	return expr;
}

/* makeOverlaps()
 * Create and populate a FuncCall node to support the OVERLAPS operator.
 */
static FuncCall *
makeOverlaps(List *largs, List *rargs)
{
	FuncCall *n = makeNode(FuncCall);
	n->funcname = SystemFuncName("overlaps");
	if (length(largs) == 1)
		largs = lappend(largs, largs);
	else if (length(largs) != 2)
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		ereport(ERROR,
				(errcode(ERRCODE_SYNTAX_ERROR),
				 errmsg("wrong number of parameters on left side of OVERLAPS expression")));
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	if (length(rargs) == 1)
		rargs = lappend(rargs, rargs);
	else if (length(rargs) != 2)
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		ereport(ERROR,
				(errcode(ERRCODE_SYNTAX_ERROR),
				 errmsg("wrong number of parameters on right side of OVERLAPS expression")));
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	n->args = nconc(largs, rargs);
	n->agg_star = FALSE;
	n->agg_distinct = FALSE;
	return n;
}

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/* findLeftmostSelect()
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 * Find the leftmost component SelectStmt in a set-operation parsetree.
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 */
static SelectStmt *
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findLeftmostSelect(SelectStmt *node)
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{
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	while (node && node->op != SETOP_NONE)
		node = node->larg;
	Assert(node && IsA(node, SelectStmt) && node->larg == NULL);
	return node;
}

/* insertSelectOptions()
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 * Insert ORDER BY, etc into an already-constructed SelectStmt.
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 *
 * This routine is just to avoid duplicating code in SelectStmt productions.
 */
static void
insertSelectOptions(SelectStmt *stmt,
					List *sortClause, List *forUpdate,
					Node *limitOffset, Node *limitCount)
{
	/*
	 * Tests here are to reject constructs like
	 *	(SELECT foo ORDER BY bar) ORDER BY baz
	 */
	if (sortClause)
	{
		if (stmt->sortClause)
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			ereport(ERROR,
					(errcode(ERRCODE_SYNTAX_ERROR),
					 errmsg("multiple ORDER BY clauses not allowed")));
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		stmt->sortClause = sortClause;
	}
	if (forUpdate)
	{
		if (stmt->forUpdate)
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			ereport(ERROR,
					(errcode(ERRCODE_SYNTAX_ERROR),
					 errmsg("multiple FOR UPDATE clauses not allowed")));
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		stmt->forUpdate = forUpdate;
	}
	if (limitOffset)
	{
		if (stmt->limitOffset)
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			ereport(ERROR,
					(errcode(ERRCODE_SYNTAX_ERROR),
					 errmsg("multiple OFFSET clauses not allowed")));
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		stmt->limitOffset = limitOffset;
	}
	if (limitCount)
	{
		if (stmt->limitCount)
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			ereport(ERROR,
					(errcode(ERRCODE_SYNTAX_ERROR),
					 errmsg("multiple LIMIT clauses not allowed")));
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		stmt->limitCount = limitCount;
	}
}

static Node *
makeSetOp(SetOperation op, bool all, Node *larg, Node *rarg)
{
	SelectStmt *n = makeNode(SelectStmt);

	n->op = op;
	n->all = all;
	n->larg = (SelectStmt *) larg;
	n->rarg = (SelectStmt *) rarg;
	return (Node *) n;
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}

8011
/* SystemFuncName()
8012
 * Build a properly-qualified reference to a built-in function.
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 */
List *
SystemFuncName(char *name)
{
	return makeList2(makeString("pg_catalog"), makeString(name));
}
8019

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/* SystemTypeName()
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 * Build a properly-qualified reference to a built-in type.
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 *
 * typmod is defaulted, but may be changed afterwards by caller.
 */
TypeName *
SystemTypeName(char *name)
{
	TypeName   *n = makeNode(TypeName);

	n->names = makeList2(makeString("pg_catalog"), makeString(name));
	n->typmod = -1;
	return n;
}

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/* parser_init()
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 * Initialize to parse one query string
 */
void
8039
parser_init(void)
8040
{
8041
	QueryIsRule = FALSE;
8042
}
8043

8044
/* exprIsNullConstant()
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 * Test whether an a_expr is a plain NULL constant or not.
 */
8047
bool
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exprIsNullConstant(Node *arg)
{
	if (arg && IsA(arg, A_Const))
	{
		A_Const *con = (A_Const *) arg;

		if (con->val.type == T_Null &&
			con->typename == NULL)
8056
			return TRUE;
8057
	}
8058
	return FALSE;
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}

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/* doNegate()
 * Handle negation of a numeric constant.
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 *
 * Formerly, we did this here because the optimizer couldn't cope with
 * indexquals that looked like "var = -4" --- it wants "var = const"
 * and a unary minus operator applied to a constant didn't qualify.
 * As of Postgres 7.0, that problem doesn't exist anymore because there
 * is a constant-subexpression simplifier in the optimizer.  However,
 * there's still a good reason for doing this here, which is that we can
 * postpone committing to a particular internal representation for simple
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 * negative constants.	It's better to leave "-123.456" in string form
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 * until we know what the desired type is.
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 */
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static Node *
doNegate(Node *n)
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{
	if (IsA(n, A_Const))
	{
		A_Const *con = (A_Const *)n;

		if (con->val.type == T_Integer)
		{
			con->val.val.ival = -con->val.val.ival;
			return n;
		}
		if (con->val.type == T_Float)
		{
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			doNegateFloat(&con->val);
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			return n;
		}
	}

8093
	return (Node *) makeSimpleA_Expr(AEXPR_OP, "-", NULL, n);
8094
}
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static void
doNegateFloat(Value *v)
{
	char   *oldval = v->val.str;

	Assert(IsA(v, Float));
	if (*oldval == '+')
		oldval++;
	if (*oldval == '-')
8105
		v->val.str = oldval+1;	/* just strip the '-' */
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	else
	{
		char   *newval = (char *) palloc(strlen(oldval) + 2);

		*newval = '-';
		strcpy(newval+1, oldval);
		v->val.str = newval;
	}
}
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#include "scan.c"