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%{ /* -*-text-*- */

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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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 * Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
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 *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.72 1997/11/25 22:05:29 momjian 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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 *	  if you use list, make sure the datum is a node so that the printing
 *	  routines work
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 *
 * WARNING
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 *	  sometimes we assign constants to makeStrings. Make sure we don't free
 *	  those.
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 *
 *-------------------------------------------------------------------------
 */
#include <string.h>
#include <ctype.h>
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#include "postgres.h"
#include "nodes/parsenodes.h"
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#include "nodes/print.h"
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#include "parser/gramparse.h"
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#include "utils/acl.h"
#include "catalog/catname.h"
#include "utils/elog.h"
#include "access/xact.h"

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static char saved_relname[NAMEDATALEN];  /* need this for complex attributes */
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static bool QueryIsRule = FALSE;
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static Node *saved_In_Expr;
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static Oid	*param_type_info;
static int	pfunc_num_args;
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extern List *parsetree;

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/*
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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*/

static char *xlateSqlType(char *);
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static Node *makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr);
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static List *makeConstantList( A_Const *node);
static char *FlattenStringList(List *list);
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static char *fmtId(char *rawid);
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static Node *makeIndexable(char *opname, Node *lexpr, Node *rexpr);
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static void param_type_init(Oid *typev, int nargs);

Oid	param_type(int t); /* used in parse_expr.c */
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/* old versions of flex define this as a macro */
#if defined(yywrap)
#undef yywrap
#endif /* yywrap */
%}


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%union
{
	double				dval;
	int					ival;
	char				chr;
	char				*str;
	bool				boolean;
	List				*list;
	Node				*node;
	Value				*value;

	Attr				*attr;

	ColumnDef			*coldef;
	ConstraintDef		*constrdef;
	TypeName			*typnam;
	DefElem				*defelt;
	ParamString			*param;
	SortGroupBy			*sortgroupby;
	IndexElem			*ielem;
	RangeVar			*range;
	RelExpr				*relexp;
	A_Indices			*aind;
	ResTarget			*target;
	ParamNo				*paramno;

	VersionStmt			*vstmt;
	DefineStmt			*dstmt;
	RuleStmt			*rstmt;
	AppendStmt			*astmt;
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}

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%type <node>	stmt,
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		AddAttrStmt, ClosePortalStmt,
		CopyStmt, CreateStmt, CreateSeqStmt, DefineStmt, DestroyStmt,
		ExtendStmt, FetchStmt,	GrantStmt, CreateTrigStmt, DropTrigStmt,
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		CreatePLangStmt, DropPLangStmt,
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		IndexStmt, ListenStmt, OptimizableStmt,
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		ProcedureStmt, 	RecipeStmt, RemoveAggrStmt, RemoveOperStmt,
		RemoveFuncStmt, RemoveStmt,
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		RenameStmt, RevokeStmt, RuleStmt, TransactionStmt, ViewStmt, LoadStmt,
		CreatedbStmt, DestroydbStmt, VacuumStmt, RetrieveStmt, CursorStmt,
		ReplaceStmt, AppendStmt, NotifyStmt, DeleteStmt, ClusterStmt,
		ExplainStmt, VariableSetStmt, VariableShowStmt, VariableResetStmt

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%type <str>		opt_database, location

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%type <node>	SubSelect
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%type <str>		join_expr, join_outer, join_spec
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%type <boolean> TriggerActionTime, TriggerForSpec, PLangTrusted
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%type <str>		TriggerEvents, TriggerFuncArg
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%type <str>		relation_name, copy_file_name, copy_delimiter, def_name,
		database_name, access_method_clause, access_method, attr_name,
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		class, index_name, name, file_name, recipe_name, aggr_argtype
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%type <str>		opt_id, opt_portal_name,
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		all_Op, MathOp, opt_name, opt_unique,
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		result, OptUseOp, opt_class, SpecialRuleRelation
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%type <str>		privileges, operation_commalist, grantee
%type <chr>		operation, TriggerOneEvent
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%type <list>	stmtblock, stmtmulti,
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		relation_name_list, OptTableElementList, tableElementList,
		OptInherit, OptConstraint, ConstraintList, definition,
		opt_with, def_args, def_name_list, func_argtypes,
		oper_argtypes, OptStmtList, OptStmtBlock, OptStmtMulti,
		opt_column_list, columnList, opt_va_list, va_list,
		sort_clause, sortby_list, index_params, index_list, name_list,
		from_clause, from_list, opt_array_bounds, nest_array_bounds,
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		expr_list, attrs, res_target_list, res_target_list2,
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		def_list, opt_indirection, group_clause, groupby_list, TriggerFuncArgs
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%type <list>	union_clause, select_list
%type <list>	join_list
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%type <sortgroupby>
				join_using
%type <boolean>	opt_union
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%type <node>	position_expr
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%type <list>	extract_list, position_list
%type <list>	substr_list, substr_from, substr_for, trim_list
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%type <list>	opt_interval
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%type <boolean> opt_inh_star, opt_binary, opt_instead, opt_with_copy,
				index_opt_unique, opt_verbose, opt_analyze
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%type <ival>	copy_dirn, def_type, opt_direction, remove_type,
				opt_column, event
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%type <ival>	fetch_how_many
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%type <list>	OptSeqList
%type <defelt>	OptSeqElem

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%type <dstmt>	def_rest
%type <astmt>	insert_rest

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%type <coldef>	columnDef, alter_clause
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%type <defelt>	def_elem
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%type <node>	def_arg, columnElem, where_clause,
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				a_expr, a_expr_or_null, AexprConst,
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				in_expr, in_expr_nodes, not_in_expr, not_in_expr_nodes,
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				having_clause
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%type <value>	NumConst
%type <attr>	event_object, attr
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%type <sortgroupby>		groupby
%type <sortgroupby>		sortby
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%type <ielem>	index_elem, func_index
%type <range>	from_val
%type <relexp>	relation_expr
%type <target>	res_target_el, res_target_el2
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%type <paramno> ParamNo
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%type <typnam>	Typename, opt_type, Array, Generic, Character, Datetime, Numeric
%type <str>		generic, character, datetime
%type <str>		opt_charset, opt_collate
%type <str>		opt_float, opt_numeric, opt_decimal
%type <boolean>	opt_varying, opt_timezone

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%type <ival>	Iconst
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%type <str>		Sconst
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%type <str>		Id, var_value, zone_value
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%type <str>		ColId, ColLabel

%type <constrdef>	ConstraintElem, ConstraintDef
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%type <list>	constraint_elem
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%type <list>	default_expr
%type <str>		opt_default
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%type <boolean>	opt_constraint
%type <list>	key_actions, key_action
%type <str>		key_match, key_reference
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/*
 * If you make any token changes, remember to:
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 *		- use "yacc -d" and update parse.h
 *		- update the keyword table in parser/keywords.c
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 */

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/* Reserved word tokens
 * SQL92 syntax has many type-specific constructs.
 * So, go ahead and make these types reserved words,
 *  and call-out the syntax explicitly.
 * This gets annoying when trying to also retain Postgres' nice
 *  type-extensible features, but we don't really have a choice.
 * - thomas 1997-10-11
 */

/* Keywords (in SQL92 reserved words) */
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%token	ACTION, ADD, ALL, ALTER, AND, ARCHIVE, AS, ASC,
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		BEGIN_TRANS, BETWEEN, BOTH, BY,
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		CASCADE, CAST, CHAR, CHARACTER, CHECK, CLOSE, COLLATE, COLUMN, COMMIT, 
		CONSTRAINT, CREATE, CROSS, CURRENT, CURRENT_DATE, CURRENT_TIME, 
		CURRENT_TIMESTAMP, CURRENT_USER, CURSOR,
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		DAY_P, DECIMAL, DECLARE, DEFAULT, DELETE, DESC, DISTINCT, DOUBLE, DROP,
		END_TRANS, EXECUTE, EXISTS, EXTRACT,
		FETCH, FLOAT, FOR, FOREIGN, FROM, FULL,
		GRANT, GROUP, HAVING, HOUR_P,
		IN, INNER_P, INSERT, INTERVAL, INTO, IS,
		JOIN, KEY, LANGUAGE, LEADING, LEFT, LIKE, LOCAL,
		MATCH, MINUTE_P, MONTH_P,
		NATIONAL, NATURAL, NCHAR, NO, NOT, NOTIFY, NOTNULL, NULL_P, NUMERIC,
		ON, OPTION, OR, ORDER, OUTER_P,
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		PARTIAL, POSITION, PRECISION, PRIMARY, PRIVILEGES, PROCEDURE, PUBLIC,
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		REFERENCES, REVOKE, RIGHT, ROLLBACK,
		SECOND_P, SELECT, SET, SUBSTRING,
		TABLE, TIME, TIMESTAMP, TO, TRAILING, TRANSACTION, TRIM,
		UNION, UNIQUE, UPDATE, USING,
		VALUES, VARCHAR, VARYING, VERBOSE, VERSION, VIEW,
		WHERE, WITH, WORK, YEAR_P, ZONE

/* Keywords (in SQL3 reserved words) */
%token	FALSE_P, TRIGGER, TRUE_P

/* Keywords (in SQL92 non-reserved words) */
%token	TYPE_P

/* Keywords for Postgres support (not in SQL92 reserved words) */
%token	ABORT_TRANS, ACL, AFTER, AGGREGATE, ANALYZE,
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		APPEND, BACKWARD, BEFORE, BINARY, CHANGE, CLUSTER, COPY,
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		DATABASE, DELIMITERS, DO, EXPLAIN, EXTEND,
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		FORWARD, FUNCTION, HANDLER,
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		INDEX, INHERITS, INSTEAD, ISNULL,
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		LANCOMPILER, LISTEN, LOAD, LOCATION, MERGE, MOVE,
		NEW, NONE, NOTHING, OIDS, OPERATOR, PROCEDURAL,
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		RECIPE, RENAME, REPLACE, RESET, RETRIEVE, RETURNS, RULE,
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		SEQUENCE, SETOF, SHOW, STDIN, STDOUT, TRUSTED, 
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		VACUUM, VERBOSE, VERSION
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/* Special keywords, not in the query language - see the "lex" file */
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%token <str>	IDENT, SCONST, Op
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%token <ival>	ICONST, PARAM
%token <dval>	FCONST

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/* these are not real. they are here so that they get generated as #define's*/
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%token			OP
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/* precedence */
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%left		OR
%left		AND
%right		NOT
%right		'='
%nonassoc	LIKE
%nonassoc	BETWEEN
%nonassoc	IN
%nonassoc	Op
%nonassoc	NOTNULL
%nonassoc	ISNULL
%nonassoc	IS
%left		'+' '-'
%left		'*' '/'
%left		'|'				/* this is the relation union op, not logical or */
/* Unary Operators */
%right		':'
%left		';'				/* end of statement or natural log */
%nonassoc	'<' '>'
%right		UMINUS
%left		'.'
%left		'[' ']'
%nonassoc	TYPECAST
%nonassoc	REDUCE
%left		UNION
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%%

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stmtblock:  stmtmulti
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				{ parsetree = $1; }
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		| stmt
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				{ parsetree = lcons($1,NIL); }
		;
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stmtmulti:  stmtmulti stmt ';'
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				{ $$ = lappend($1, $2); }
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		| stmtmulti stmt
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				{ $$ = lappend($1, $2); }
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		| stmt ';'
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				{ $$ = lcons($1,NIL); }
		;
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stmt :	  AddAttrStmt
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		| ClosePortalStmt
		| CopyStmt
		| CreateStmt
		| CreateSeqStmt
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		| CreatePLangStmt
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		| CreateTrigStmt
		| ClusterStmt
		| DefineStmt
		| DestroyStmt
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		| DropPLangStmt
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		| DropTrigStmt
		| ExtendStmt
		| ExplainStmt
		| FetchStmt
		| GrantStmt
		| IndexStmt
		| ListenStmt
		| ProcedureStmt
		| RecipeStmt
		| RemoveAggrStmt
		| RemoveOperStmt
		| RemoveFuncStmt
		| RemoveStmt
		| RenameStmt
		| RevokeStmt
		| OptimizableStmt
		| RuleStmt
		| TransactionStmt
		| ViewStmt
		| LoadStmt
		| CreatedbStmt
		| DestroydbStmt
		| VacuumStmt
		| VariableSetStmt
		| VariableShowStmt
		| VariableResetStmt
		;
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/*****************************************************************************
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 *
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 * Set PG internal variable
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 *	  SET name TO 'var_value'
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 * Include SQL92 syntax (thomas 1997-10-22):
 *    SET TIME ZONE 'var_value'
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 *
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 *****************************************************************************/

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VariableSetStmt:  SET ColId TO var_value
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				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name  = $2;
					n->value = $4;
					$$ = (Node *) n;
				}
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		| SET ColId '=' var_value
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				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name  = $2;
					n->value = $4;
					$$ = (Node *) n;
				}
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		| SET TIME ZONE zone_value
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				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name  = "timezone";
					n->value = $4;
					$$ = (Node *) n;
				}
		;

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var_value:  Sconst			{ $$ = $1; }
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		| DEFAULT			{ $$ = NULL; }
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		;

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zone_value:  Sconst			{ $$ = $1; }
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		| DEFAULT			{ $$ = NULL; }
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		| LOCAL				{ $$ = "default"; }
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		;
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VariableShowStmt:  SHOW ColId
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				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name  = $2;
					$$ = (Node *) n;
				}
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		| SHOW TIME ZONE
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name  = "timezone";
					$$ = (Node *) n;
				}
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		;

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VariableResetStmt:	RESET ColId
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				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name  = $2;
					$$ = (Node *) n;
				}
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		| RESET TIME ZONE
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name  = "timezone";
					$$ = (Node *) n;
				}
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		;
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/*****************************************************************************
 *
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 *		QUERY :
 *				addattr ( attr1 = type1 .. attrn = typen ) to <relname> [*]
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 *
 *****************************************************************************/

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AddAttrStmt:  ALTER TABLE relation_name opt_inh_star alter_clause
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				{
					AddAttrStmt *n = makeNode(AddAttrStmt);
					n->relname = $3;
					n->inh = $4;
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					n->colDef = $5;
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					$$ = (Node *)n;
				}
		;
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alter_clause:  ADD opt_column columnDef
				{
					$$ = $3;
				}
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			| ADD '(' tableElementList ')'
				{
					ColumnDef *lp = lfirst($3);

					if (length($3) != 1)
						elog(WARN,"ALTER TABLE/ADD() allows one column only",NULL);
					$$ = lp;
				}
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			| DROP opt_column ColId
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				{	elog(WARN,"ALTER TABLE/DROP COLUMN not yet implemented",NULL); }
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			| ALTER opt_column ColId SET opt_default
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				{	elog(WARN,"ALTER TABLE/ALTER COLUMN/SET DEFAULT not yet implemented",NULL); }
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			| ALTER opt_column ColId DROP DEFAULT
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				{	elog(WARN,"ALTER TABLE/ALTER COLUMN/DROP DEFAULT not yet implemented",NULL); }
			| ADD ConstraintElem
				{	elog(WARN,"ALTER TABLE/ADD CONSTRAINT not yet implemented",NULL); }
		;

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columnDef:  ColId Typename opt_default opt_constraint
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				{
					$$ = makeNode(ColumnDef);
					$$->colname = $1;
					$$->typename = $2;
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					$$->defval = $3;
					$$->is_not_null = $4;
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				}
		;
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opt_default:  DEFAULT default_expr
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				{
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					$$ = FlattenStringList($2);
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				}
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			| /*EMPTY*/		{ $$ = NULL; }
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	;
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default_expr:  AexprConst
				{	$$ = makeConstantList((A_Const *) $1); }
			| Pnull
				{	$$ = lcons( makeString("NULL"), NIL); }
			| '-' default_expr %prec UMINUS
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				{	$$ = lcons( makeString( "-"), $2); }
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			| default_expr '+' default_expr
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				{	$$ = nconc( $1, lcons( makeString( "+"), $3)); }
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			| default_expr '-' default_expr
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				{	$$ = nconc( $1, lcons( makeString( "-"), $3)); }
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			| default_expr '/' default_expr
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				{	$$ = nconc( $1, lcons( makeString( "/"), $3)); }
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			| default_expr '*' default_expr
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				{	$$ = nconc( $1, lcons( makeString( "*"), $3)); }
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			| default_expr '=' default_expr
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				{	elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
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			| default_expr '<' default_expr
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				{	elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
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			| default_expr '>' default_expr
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				{	elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
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			| ':' default_expr
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				{	$$ = lcons( makeString( ":"), $2); }
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			| ';' default_expr
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				{	$$ = lcons( makeString( ";"), $2); }
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			| '|' default_expr
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				{	$$ = lcons( makeString( "|"), $2); }
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			| default_expr TYPECAST Typename
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				{
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					$3->name = fmtId($3->name);
					$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
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				}
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			| CAST default_expr AS Typename
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				{
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					$4->name = fmtId($4->name);
					$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
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				}
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			| '(' default_expr ')'
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				{	$$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
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			| name '(' default_expr ')'
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				{
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					$$ = makeList( makeString($1), makeString("("), -1);
					$$ = nconc( $$, $3);
					$$ = lappend( $$, makeString(")"));
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				}
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			| name '(' ')'
				{
					$$ = makeList( makeString($1), makeString("("), -1);
					$$ = lappend( $$, makeString(")"));
				}
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			| default_expr Op default_expr
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				{
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					if (!strcmp("<=", $2) || !strcmp(">=", $2))
						elog(WARN,"boolean expressions not supported in DEFAULT",NULL);
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					$$ = nconc( $1, lcons( makeString( $2), $3));
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				}
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			| Op default_expr
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				{	$$ = lcons( makeString( $1), $2); }
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			| default_expr Op
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				{	$$ = lappend( $1, makeString( $2)); }
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			/* XXX - thomas 1997-10-07 v6.2 function-specific code to be changed */
			| CURRENT_DATE
				{	$$ = lcons( makeString( "date( 'current'::datetime + '0 sec')"), NIL); }
			| CURRENT_TIME
				{	$$ = lcons( makeString( "'now'::time"), NIL); }
			| CURRENT_TIME '(' Iconst ')'
				{
					if ($3 != 0)
						elog(NOTICE,"CURRENT_TIME(p) precision must be zero",NULL);
					$$ = lcons( makeString( "'now'::time"), NIL);
				}
			| CURRENT_TIMESTAMP
				{	$$ = lcons( makeString( "now()"), NIL); }
			| CURRENT_TIMESTAMP '(' Iconst ')'
				{
					if ($3 != 0)
						elog(NOTICE,"CURRENT_TIMESTAMP(p) precision must be zero",NULL);
					$$ = lcons( makeString( "now()"), NIL);
				}
			| CURRENT_USER
				{	$$ = lcons( makeString( "CURRENT_USER"), NIL); }
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		;

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opt_constraint:  NOT NULL_P						{ $$ = TRUE; }
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			| NOTNULL							{ $$ = TRUE; }
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			| UNIQUE
				{
					elog(WARN,"CREATE TABLE/UNIQUE not yet implemented",NULL);
					$$ = FALSE;
				}
			| PRIMARY KEY
				{
					elog(WARN,"CREATE TABLE/PRIMARY KEY not yet implemented",NULL);
					$$ = FALSE;
				}
			| REFERENCES ColId opt_column_list key_match key_actions
				{
					elog(WARN,"CREATE TABLE/FOREIGN KEY not yet implemented",NULL);
					$$ = FALSE;
				}
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			| /* EMPTY */						{ $$ = FALSE; }
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		;

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/*****************************************************************************
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 *
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 *		QUERY :
 *				close <optname>
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 *
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 *****************************************************************************/

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ClosePortalStmt:  CLOSE opt_id
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				{
					ClosePortalStmt *n = makeNode(ClosePortalStmt);
					n->portalname = $2;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY :
 *				COPY [BINARY] <relname> FROM/TO
 *				[USING DELIMITERS <delimiter>]
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 *
 *****************************************************************************/

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CopyStmt:  COPY opt_binary relation_name opt_with_copy copy_dirn copy_file_name copy_delimiter
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				{
					CopyStmt *n = makeNode(CopyStmt);
					n->binary = $2;
					n->relname = $3;
					n->oids = $4;
					n->direction = $5;
					n->filename = $6;
					n->delimiter = $7;
					$$ = (Node *)n;
				}
		;

copy_dirn:	TO
				{ $$ = TO; }
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		| FROM
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				{ $$ = FROM; }
		;
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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
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 */
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copy_file_name:  Sconst							{ $$ = $1; }
		| STDIN									{ $$ = NULL; }
		| STDOUT								{ $$ = NULL; }
		;
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opt_binary:  BINARY								{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
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		;
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opt_with_copy:	WITH OIDS						{ $$ = TRUE; }
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		| /* EMPTY */							{ $$ = FALSE; }
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		;
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/*
 * the default copy delimiter is tab but the user can configure it
 */
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copy_delimiter:  USING DELIMITERS Sconst { $$ = $3;}
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		| /* EMPTY */  { $$ = "\t"; }
		;
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/*****************************************************************************
 *
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 *		QUERY :
 *				CREATE relname
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 *
 *****************************************************************************/

CreateStmt:  CREATE TABLE relation_name '(' OptTableElementList ')'
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				OptInherit OptConstraint OptArchiveType
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				{
					CreateStmt *n = makeNode(CreateStmt);
					n->relname = $3;
					n->tableElts = $5;
					n->inhRelnames = $7;
					n->constraints = $8;
					$$ = (Node *)n;
				}
		;

OptTableElementList:  tableElementList			{ $$ = $1; }
		| /* EMPTY */							{ $$ = NULL; }
		;
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tableElementList :
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		  tableElementList ',' columnDef
				{ $$ = lappend($1, $3); }
		| columnDef
				{ $$ = lcons($1, NIL); }
		;
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/*
 *	This was removed in 6.3, but we keep it so people can upgrade
 *	with old pg_dump scripts.
 */
OptArchiveType:  ARCHIVE '=' NONE						{ }
		| /*EMPTY*/										{ }
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		;
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OptInherit:  INHERITS '(' relation_name_list ')'		{ $$ = $3; }
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		| /*EMPTY*/										{ $$ = NIL; }
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		;
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OptConstraint:	ConstraintList							{ $$ = $1; }
		| /*EMPTY*/										{ $$ = NULL; }
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		;
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ConstraintList:
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		  ConstraintList ',' ConstraintElem
				{ $$ = lappend($1, $3); }
		| ConstraintElem
				{ $$ = lcons($1, NIL); }
		;

ConstraintElem:
		CONSTRAINT name ConstraintDef
				{
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						$3->name = fmtId($2);
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						$$ = $3;
				}
		| ConstraintDef			{ $$ = $1; }
		;

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ConstraintDef:	CHECK constraint_elem
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				{
					ConstraintDef *constr = palloc (sizeof(ConstraintDef));
					constr->type = CONSTR_CHECK;
					constr->name = NULL;
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					constr->def = FlattenStringList($2);
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					$$ = constr;
				}
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		| UNIQUE '(' columnList ')'
				{	elog(WARN,"CREATE TABLE/UNIQUE not yet implemented",NULL); }
		| PRIMARY KEY '(' columnList ')'
				{	elog(WARN,"CREATE TABLE/PRIMARY KEY not yet implemented",NULL); }
		| FOREIGN KEY '(' columnList ')' REFERENCES ColId opt_column_list key_match key_actions
				{	elog(WARN,"CREATE TABLE/FOREIGN KEY not yet implemented",NULL); }
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		;
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constraint_elem:  AexprConst
				{	$$ = makeConstantList((A_Const *) $1); }
			| Pnull
				{	$$ = lcons( makeString("NULL"), NIL); }
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			| ColId
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				{
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					$$ = lcons( makeString(fmtId($1)), NIL);
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				}
			| '-' constraint_elem %prec UMINUS
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				{	$$ = lcons( makeString( "-"), $2); }
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			| constraint_elem '+' constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( "+"), $3)); }
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			| constraint_elem '-' constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( "-"), $3)); }
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			| constraint_elem '/' constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( "/"), $3)); }
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			| constraint_elem '*' constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( "*"), $3)); }
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			| constraint_elem '=' constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( "="), $3)); }
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			| constraint_elem '<' constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( "<"), $3)); }
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			| constraint_elem '>' constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( ">"), $3)); }
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			| ':' constraint_elem
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				{	$$ = lcons( makeString( ":"), $2); }
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			| ';' constraint_elem
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				{	$$ = lcons( makeString( ";"), $2); }
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			| '|' constraint_elem
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				{	$$ = lcons( makeString( "|"), $2); }
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			| constraint_elem TYPECAST Typename
				{
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					$3->name = fmtId($3->name);
					$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
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				}
			| CAST constraint_elem AS Typename
				{
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					$4->name = fmtId($4->name);
					$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
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				}
			| '(' constraint_elem ')'
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				{	$$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
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			| name '(' constraint_elem ')'
				{
					$$ = makeList( makeString($1), makeString("("), -1);
					$$ = nconc( $$, $3);
					$$ = lappend( $$, makeString(")"));
				}
			| constraint_elem Op constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( $2), $3)); }
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			| constraint_elem AND constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( "AND"), $3)); }
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			| constraint_elem OR constraint_elem
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				{	$$ = nconc( $1, lcons( makeString( "OR"), $3)); }
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			| Op constraint_elem
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				{	$$ = lcons( makeString( $1), $2); }
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			| constraint_elem Op
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				{	$$ = lappend( $1, makeString( $2)); }
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			| constraint_elem IS TRUE_P
				{	$$ = lappend( $1, makeString( "IS TRUE")); }
			| constraint_elem IS FALSE_P
				{	$$ = lappend( $1, makeString( "IS FALSE")); }
			| constraint_elem IS NOT TRUE_P
				{	$$ = lappend( $1, makeString( "IS NOT TRUE")); }
			| constraint_elem IS NOT FALSE_P
				{	$$ = lappend( $1, makeString( "IS NOT FALSE")); }
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		;

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key_match:  MATCH FULL					{ $$ = NULL; }
		| MATCH PARTIAL					{ $$ = NULL; }
		| /*EMPTY*/						{ $$ = NULL; }
		;

key_actions:  key_action key_action		{ $$ = NIL; }
		| key_action					{ $$ = NIL; }
		| /*EMPTY*/						{ $$ = NIL; }
		;

key_action:  ON DELETE key_reference	{ $$ = NIL; }
		| ON UPDATE key_reference		{ $$ = NIL; }
		;

key_reference:  NO ACTION				{ $$ = NULL; }
		| CASCADE						{ $$ = NULL; }
		| SET DEFAULT					{ $$ = NULL; }
		| SET NULL_P					{ $$ = NULL; }
		;

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/*****************************************************************************
 *
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 *		QUERY :
 *				CREATE SEQUENCE seqname
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 *
 *****************************************************************************/

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CreateSeqStmt:	CREATE SEQUENCE relation_name OptSeqList
				{
					CreateSeqStmt *n = makeNode(CreateSeqStmt);
					n->seqname = $3;
					n->options = $4;
					$$ = (Node *)n;
				}
		;
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OptSeqList:
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				OptSeqList OptSeqElem
				{ $$ = lappend($1, $2); }
		|		{ $$ = NIL; }
		;

OptSeqElem:		IDENT NumConst
				{
					$$ = makeNode(DefElem);
					$$->defname = $1;
					$$->arg = (Node *)$2;
				}
		|		IDENT
				{
					$$ = makeNode(DefElem);
					$$->defname = $1;
					$$->arg = (Node *)NULL;
				}
		;
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/*****************************************************************************
 *
 *		QUERIES :
 *				CREATE PROCEDURAL LANGUAGE ...
 *				DROP PROCEDURAL LANGUAGE ...
 *
 *****************************************************************************/

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CreatePLangStmt:  CREATE PLangTrusted PROCEDURAL LANGUAGE Sconst 
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			HANDLER def_name LANCOMPILER Sconst
			{
				CreatePLangStmt *n = makeNode(CreatePLangStmt);
				n->plname = $5;
				n->plhandler = $7;
				n->plcompiler = $9;
				n->pltrusted = $2;
				$$ = (Node *)n;
			}
		;

PLangTrusted:		TRUSTED { $$ = TRUE; }
			|	{ $$ = FALSE; }

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DropPLangStmt:  DROP PROCEDURAL LANGUAGE Sconst
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			{
				DropPLangStmt *n = makeNode(DropPLangStmt);
				n->plname = $4;
				$$ = (Node *)n;
			}
		;
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/*****************************************************************************
 *
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 *		QUERIES :
 *				CREATE TRIGGER ...
 *				DROP TRIGGER ...
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 *
 *****************************************************************************/

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CreateTrigStmt:  CREATE TRIGGER name TriggerActionTime TriggerEvents ON
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				relation_name TriggerForSpec EXECUTE PROCEDURE
				name '(' TriggerFuncArgs ')'
				{
					CreateTrigStmt *n = makeNode(CreateTrigStmt);
					n->trigname = $3;
					n->relname = $7;
					n->funcname = $11;
					n->args = $13;
					n->before = $4;
					n->row = $8;
					memcpy (n->actions, $5, 4);
					$$ = (Node *)n;
				}
		;

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

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

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

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TriggerForSpec:  FOR name name
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				{
						if ( strcmp ($2, "each") != 0 )
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								elog(WARN,"parser: syntax error near %s",$2);
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						if ( strcmp ($3, "row") == 0 )
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								$$ = TRUE;
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						else if ( strcmp ($3, "statement") == 0 )
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								$$ = FALSE;
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						else
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								elog(WARN,"parser: syntax error near %s",$3);
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				}
		;
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TriggerFuncArgs:  TriggerFuncArg
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				{ $$ = lcons($1, NIL); }
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		| TriggerFuncArgs ',' TriggerFuncArg
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				{ $$ = lappend($1, $3); }
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		| /*EMPTY*/
				{ $$ = NIL; }
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		;

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TriggerFuncArg:  ICONST
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					{
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						char *s = (char *) palloc (256);
						sprintf (s, "%d", $1);
						$$ = s;
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					}
				| FCONST
					{
						char *s = (char *) palloc (256);
						sprintf (s, "%g", $1);
						$$ = s;
					}
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				| Sconst		{  $$ = $1; }
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				| IDENT			{  $$ = $1; }
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		;
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DropTrigStmt:	DROP TRIGGER name ON relation_name
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				{
					DropTrigStmt *n = makeNode(DropTrigStmt);
					n->trigname = $3;
					n->relname = $5;
					$$ = (Node *) n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY :
 *				define (type,operator,aggregate)
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 *
 *****************************************************************************/

DefineStmt:  CREATE def_type def_rest
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				{
					$3->defType = $2;
					$$ = (Node *)$3;
				}
		;
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def_rest:  def_name definition
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				{
					$$ = makeNode(DefineStmt);
					$$->defname = $1;
					$$->definition = $2;
				}
		;

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def_type:  OPERATOR							{ $$ = OPERATOR; }
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		| Type								{ $$ = TYPE_P; }
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		| AGGREGATE							{ $$ = AGGREGATE; }
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		;
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def_name:  PROCEDURE						{ $$ = "procedure"; }
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		| JOIN								{ $$ = "join"; }
		| ColId								{ $$ = $1; }
		| MathOp							{ $$ = $1; }
		| Op								{ $$ = $1; }
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		;
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definition:  '(' def_list ')'				{ $$ = $2; }
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		;
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def_list:  def_elem							{ $$ = lcons($1, NIL); }
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		| def_list ',' def_elem				{ $$ = lappend($1, $3); }
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		;
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def_elem:  def_name '=' def_arg
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				{
					$$ = makeNode(DefElem);
					$$->defname = $1;
					$$->arg = (Node *)$3;
				}
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		| def_name
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				{
					$$ = makeNode(DefElem);
					$$->defname = $1;
					$$->arg = (Node *)NULL;
				}
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		| DEFAULT '=' def_arg
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				{
					$$ = makeNode(DefElem);
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					$$->defname = "default";
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					$$->arg = (Node *)$3;
				}
		;

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def_arg:  ColId							{  $$ = (Node *)makeString($1); }
		| all_Op						{  $$ = (Node *)makeString($1); }
		| NumConst						{  $$ = (Node *)$1; /* already a Value */ }
		| Sconst						{  $$ = (Node *)makeString($1); }
		| SETOF ColId
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				{
					TypeName *n = makeNode(TypeName);
					n->name = $2;
					n->setof = TRUE;
					n->arrayBounds = NULL;
					$$ = (Node *)n;
				}
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		| DOUBLE						{  $$ = (Node *)makeString("double"); }
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		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				destroy <relname1> [, <relname2> .. <relnameN> ]
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 *
 *****************************************************************************/

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DestroyStmt:  DROP TABLE relation_name_list
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				{
					DestroyStmt *n = makeNode(DestroyStmt);
					n->relNames = $3;
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					n->sequence = FALSE;
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					$$ = (Node *)n;
				}
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		| DROP SEQUENCE relation_name_list
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				{
					DestroyStmt *n = makeNode(DestroyStmt);
					n->relNames = $3;
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					n->sequence = TRUE;
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					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
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 *			fetch/move [forward | backward] [number | all ] [ in <portalname> ]
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 *
 *****************************************************************************/

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FetchStmt:	FETCH opt_direction fetch_how_many opt_portal_name
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = $2;
					n->howMany = $3;
					n->portalname = $4;
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					n->ismove = false;
					$$ = (Node *)n;
				}
		|	MOVE opt_direction fetch_how_many opt_portal_name
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = $2;
					n->howMany = $3;
					n->portalname = $4;
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					n->ismove = TRUE;
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					$$ = (Node *)n;
				}
		;

opt_direction:	FORWARD							{ $$ = FORWARD; }
		| BACKWARD								{ $$ = BACKWARD; }
		| /*EMPTY*/								{ $$ = FORWARD; /* default */ }
		;
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fetch_how_many:  Iconst
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			   { $$ = $1;
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				 if ($1 <= 0) elog(WARN,"Please specify nonnegative count for fetch",NULL); }
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		| ALL							{ $$ = 0; /* 0 means fetch all tuples*/}
		| /*EMPTY*/						{ $$ = 1; /*default*/ }
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		;
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opt_portal_name:  IN name				{ $$ = $2;}
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		| /*EMPTY*/						{ $$ = NULL; }
		;

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/*****************************************************************************
 *
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 *		QUERY:
 *				GRANT [privileges] ON [relation_name_list] TO [GROUP] grantee
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 *
 *****************************************************************************/

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GrantStmt:  GRANT privileges ON relation_name_list TO grantee opt_with_grant
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				{
					$$ = (Node*)makeAclStmt($2,$4,$6,'+');
					free($2);
					free($6);
				}
		;
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privileges:  ALL PRIVILEGES
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				{
				 $$ = aclmakepriv("rwaR",0);
				}
		| ALL
				{
				 $$ = aclmakepriv("rwaR",0);
				}
		| operation_commalist
				{
				 $$ = $1;
				}
		;

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operation_commalist:  operation
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				{
						$$ = aclmakepriv("",$1);
				}
		| operation_commalist ',' operation
				{
						$$ = aclmakepriv($1,$3);
						free($1);
				}
		;

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operation:  SELECT
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				{
						$$ = ACL_MODE_RD_CHR;
				}
		| INSERT
				{
						$$ = ACL_MODE_AP_CHR;
				}
		| UPDATE
				{
						$$ = ACL_MODE_WR_CHR;
				}
		| DELETE
				{
						$$ = ACL_MODE_WR_CHR;
				}
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		| RULE
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				{
						$$ = ACL_MODE_RU_CHR;
				}
		;

grantee:  PUBLIC
				{
						$$ = aclmakeuser("A","");
				}
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		| GROUP ColId
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				{
						$$ = aclmakeuser("G",$2);
				}
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		| ColId
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				{
						$$ = aclmakeuser("U",$1);
				}
		;
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opt_with_grant:  WITH GRANT OPTION
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				{
					yyerror("WITH GRANT OPTION is not supported.  Only relation owners can set privileges");
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				 }
		| /*EMPTY*/
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		;

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/*****************************************************************************
 *
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 *		QUERY:
 *				REVOKE [privileges] ON [relation_name] FROM [user]
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 *
 *****************************************************************************/

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RevokeStmt:  REVOKE privileges ON relation_name_list FROM grantee
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				{
					$$ = (Node*)makeAclStmt($2,$4,$6,'-');
					free($2);
					free($6);
				}
		;
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/*****************************************************************************
 *
1237
 *		QUERY:
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1238
 *				create index <indexname> on <relname>
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 *				  using <access> "(" (<col> with <op>)+ ")" [with
 *				  <target_list>]
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 *
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 *	[where <qual>] is not supported anymore
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 *****************************************************************************/

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IndexStmt:	CREATE index_opt_unique INDEX index_name ON relation_name
			access_method_clause '(' index_params ')' opt_with
				{
					/* should check that access_method is valid,
					   etc ... but doesn't */
					IndexStmt *n = makeNode(IndexStmt);
					n->unique = $2;
					n->idxname = $4;
					n->relname = $6;
					n->accessMethod = $7;
					n->indexParams = $9;
					n->withClause = $11;
					n->whereClause = NULL;
					$$ = (Node *)n;
				}
		;

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index_opt_unique:  UNIQUE						{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
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		;

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access_method_clause:  USING access_method		{ $$ = $2; }
		| /*EMPTY*/								{ $$ = "btree"; }
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		;
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index_params:  index_list						{ $$ = $1; }
		| func_index							{ $$ = lcons($1,NIL); }
		;

index_list:  index_list ',' index_elem			{ $$ = lappend($1, $3); }
		| index_elem							{ $$ = lcons($1, NIL); }
		;

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func_index:  name '(' name_list ')' opt_type opt_class
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				{
					$$ = makeNode(IndexElem);
					$$->name = $1;
					$$->args = $3;
					$$->class = $6;
					$$->tname = $5;
				}
		  ;

index_elem:  attr_name opt_type opt_class
				{
					$$ = makeNode(IndexElem);
					$$->name = $1;
					$$->args = NIL;
					$$->class = $3;
					$$->tname = $2;
				}
		;

opt_type:  ':' Typename							{ $$ = $2;}
		| FOR Typename							{ $$ = $2;}
		| /*EMPTY*/								{ $$ = NULL;}
		;

/* opt_class "WITH class" conflicts with preceeding opt_type
 *  for Typename of "TIMESTAMP WITH TIME ZONE"
 * So, remove "WITH class" from the syntax. OK??
 * - thomas 1997-10-12
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 *		| WITH class							{ $$ = $2; }
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 */
opt_class:  class								{ $$ = $1; }
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		| USING class							{ $$ = $2; }
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		| /*EMPTY*/								{ $$ = NULL; }
		;


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/*****************************************************************************
 *
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 *		QUERY:
 *				extend index <indexname> [where <qual>]
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 *
 *****************************************************************************/

ExtendStmt:  EXTEND INDEX index_name where_clause
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				{
					ExtendStmt *n = makeNode(ExtendStmt);
					n->idxname = $3;
					n->whereClause = $4;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				execute recipe <recipeName>
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 *
 *****************************************************************************/

1339
RecipeStmt:  EXECUTE RECIPE recipe_name
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				{
					RecipeStmt *n;
					if (!IsTransactionBlock())
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						elog(WARN,"EXECUTE RECIPE may only be used in begin/end transaction blocks",NULL);
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					n = makeNode(RecipeStmt);
					n->recipeName = $3;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				define function <fname>
 *					   (language = <lang>, returntype = <typename>
 *						[, arch_pct = <percentage | pre-defined>]
 *						[, disk_pct = <percentage | pre-defined>]
 *						[, byte_pct = <percentage | pre-defined>]
 *						[, perbyte_cpu = <int | pre-defined>]
 *						[, percall_cpu = <int | pre-defined>]
 *						[, iscachable])
 *						[arg is (<type-1> { , <type-n>})]
 *						as <filename or code in language as appropriate>
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 *
 *****************************************************************************/

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ProcedureStmt:	CREATE FUNCTION def_name def_args
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			 RETURNS def_arg opt_with AS Sconst LANGUAGE Sconst
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				{
					ProcedureStmt *n = makeNode(ProcedureStmt);
					n->funcname = $3;
					n->defArgs = $4;
					n->returnType = (Node *)$6;
					n->withClause = $7;
					n->as = $9;
					n->language = $11;
					$$ = (Node *)n;
				};

opt_with:  WITH definition						{ $$ = $2; }
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		| /* EMPTY */							{ $$ = NIL; }
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		;

def_args:  '(' def_name_list ')'				{ $$ = $2; }
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		| '(' ')'								{ $$ = NIL; }
1387
		;
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1389
def_name_list:	name_list;
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/*****************************************************************************
 *
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 *		QUERY:
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 *
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 *		remove function <funcname>
 *				(REMOVE FUNCTION "funcname" (arg1, arg2, ...))
 *		remove aggregate <aggname>
 *				(REMOVE AGGREGATE "aggname" "aggtype")
 *		remove operator <opname>
 *				(REMOVE OPERATOR "opname" (leftoperand_typ rightoperand_typ))
 *		remove type <typename>
 *				(REMOVE TYPE "typename")
 *		remove rule <rulename>
 *				(REMOVE RULE "rulename")
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 *
 *****************************************************************************/

RemoveStmt:  DROP remove_type name
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				{
					RemoveStmt *n = makeNode(RemoveStmt);
					n->removeType = $2;
					n->name = $3;
					$$ = (Node *)n;
				}
		;

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remove_type:  Type								{  $$ = TYPE_P; }
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		| INDEX									{  $$ = INDEX; }
		| RULE									{  $$ = RULE; }
		| VIEW									{  $$ = VIEW; }
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		;
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1423
RemoveAggrStmt:  DROP AGGREGATE name aggr_argtype
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				{
						RemoveAggrStmt *n = makeNode(RemoveAggrStmt);
						n->aggname = $3;
						n->aggtype = $4;
						$$ = (Node *)n;
				}
		;

aggr_argtype:  name								{ $$ = $1; }
1433
		| '*'									{ $$ = NULL; }
1434
		;
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1436
RemoveFuncStmt:  DROP FUNCTION name '(' func_argtypes ')'
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				{
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->funcname = $3;
					n->args = $5;
					$$ = (Node *)n;
				}
		;

func_argtypes:	name_list						{ $$ = $1; }
1446
		| /*EMPTY*/								{ $$ = NIL; }
1447
		;
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RemoveOperStmt:  DROP OPERATOR all_Op '(' oper_argtypes ')'
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				{
					RemoveOperStmt *n = makeNode(RemoveOperStmt);
					n->opname = $3;
					n->args = $5;
					$$ = (Node *)n;
				}
		;
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1458
all_Op:  Op | MathOp;
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MathOp:	'+'				{ $$ = "+"; }
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		| '-'			{ $$ = "-"; }
		| '*'			{ $$ = "*"; }
		| '/'			{ $$ = "/"; }
		| '<'			{ $$ = "<"; }
		| '>'			{ $$ = ">"; }
		| '='			{ $$ = "="; }
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		;

oper_argtypes:	name
				{
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				   elog(WARN,"parser: argument type missing (use NONE for unary operators)",NULL);
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				}
		| name ',' name
				{ $$ = makeList(makeString($1), makeString($3), -1); }
		| NONE ',' name			/* left unary */
				{ $$ = makeList(NULL, makeString($3), -1); }
		| name ',' NONE			/* right unary */
				{ $$ = makeList(makeString($1), NULL, -1); }
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				rename <attrname1> in <relname> [*] to <attrname2>
 *				rename <relname1> to <relname2>
1487
 *
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 *****************************************************************************/

1490
RenameStmt:  ALTER TABLE relation_name opt_inh_star
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				  RENAME opt_column opt_name TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->relname = $3;
					n->inh = $4;
					n->column = $7;
					n->newname = $9;
					$$ = (Node *)n;
				}
		;

opt_name:  name							{ $$ = $1; }
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		| /*EMPTY*/						{ $$ = NULL; }
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		;

opt_column:  COLUMN						{ $$ = COLUMN; }
		| /*EMPTY*/						{ $$ = 0; }
		;
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/*****************************************************************************
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 *
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 *		QUERY:	Define Rewrite Rule , Define Tuple Rule
 *				Define Rule <old rules >
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 *
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 *		only rewrite rule is supported -- ay 9/94
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 *
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 *****************************************************************************/

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RuleStmt:  CREATE RULE name AS
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		   { QueryIsRule=TRUE; }
		   ON event TO event_object where_clause
		   DO opt_instead OptStmtList
				{
					RuleStmt *n = makeNode(RuleStmt);
					n->rulename = $3;
					n->event = $7;
					n->object = $9;
					n->whereClause = $10;
					n->instead = $12;
					n->actions = $13;
					$$ = (Node *)n;
				}
		;

OptStmtList:  NOTHING					{ $$ = NIL; }
		| OptimizableStmt				{ $$ = lcons($1, NIL); }
		| '[' OptStmtBlock ']'			{ $$ = $2; }
		;
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1541
OptStmtBlock:  OptStmtMulti
1542
				{  $$ = $1; }
1543
		| OptimizableStmt
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				{ $$ = lcons($1, NIL); }
		;
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1547
OptStmtMulti:  OptStmtMulti OptimizableStmt ';'
1548
				{  $$ = lappend($1, $2); }
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		| OptStmtMulti OptimizableStmt
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				{  $$ = lappend($1, $2); }
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		| OptimizableStmt ';'
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				{ $$ = lcons($1, NIL); }
		;
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event_object:  relation_name '.' attr_name
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				{
					$$ = makeNode(Attr);
					$$->relname = $1;
					$$->paramNo = NULL;
					$$->attrs = lcons(makeString($3), NIL);
					$$->indirection = NIL;
				}
		| relation_name
				{
					$$ = makeNode(Attr);
					$$->relname = $1;
					$$->paramNo = NULL;
					$$->attrs = NIL;
					$$->indirection = NIL;
				}
		;
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/* change me to select, update, etc. some day */
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event:	SELECT							{ $$ = CMD_SELECT; }
		| UPDATE						{ $$ = CMD_UPDATE; }
		| DELETE						{ $$ = CMD_DELETE; }
		| INSERT						{ $$ = CMD_INSERT; }
		 ;
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1580 1581 1582
opt_instead:  INSTEAD					{ $$ = TRUE; }
		| /* EMPTY */					{ $$ = FALSE; }
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				NOTIFY <relation_name>	can appear both in rule bodies and
 *				as a query-level command
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 *
 *****************************************************************************/

1593
NotifyStmt:  NOTIFY relation_name
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				{
					NotifyStmt *n = makeNode(NotifyStmt);
					n->relname = $2;
					$$ = (Node *)n;
				}
		;
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1601
ListenStmt:  LISTEN relation_name
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				{
					ListenStmt *n = makeNode(ListenStmt);
					n->relname = $2;
					$$ = (Node *)n;
				}
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;


/*****************************************************************************
 *
1612
 *		Transactions:
1613
 *
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 *		abort transaction
 *				(ABORT)
 *		begin transaction
 *				(BEGIN)
 *		end transaction
 *				(END)
1620
 *
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 *****************************************************************************/

TransactionStmt:  ABORT_TRANS TRANSACTION
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				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = ABORT_TRANS;
					$$ = (Node *)n;
				}
		| BEGIN_TRANS TRANSACTION
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = BEGIN_TRANS;
					$$ = (Node *)n;
				}
		| BEGIN_TRANS WORK
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = BEGIN_TRANS;
					$$ = (Node *)n;
				}
		| COMMIT WORK
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = END_TRANS;
					$$ = (Node *)n;
				}
		| END_TRANS TRANSACTION
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = END_TRANS;
					$$ = (Node *)n;
				}
		| ROLLBACK WORK
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = ABORT_TRANS;
					$$ = (Node *)n;
				}

		| ABORT_TRANS
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = ABORT_TRANS;
					$$ = (Node *)n;
				}
		| BEGIN_TRANS
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = BEGIN_TRANS;
					$$ = (Node *)n;
				}
		| COMMIT
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = END_TRANS;
					$$ = (Node *)n;
				}

		| END_TRANS
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = END_TRANS;
					$$ = (Node *)n;
				}
		| ROLLBACK
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = ABORT_TRANS;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				define view <viewname> '('target-list ')' [where <quals> ]
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 *
 *****************************************************************************/

ViewStmt:  CREATE VIEW name AS RetrieveStmt
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				{
					ViewStmt *n = makeNode(ViewStmt);
					n->viewname = $3;
					n->query = (Query *)$5;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				load "filename"
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 *
 *****************************************************************************/

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LoadStmt:  LOAD file_name
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				{
					LoadStmt *n = makeNode(LoadStmt);
					n->filename = $2;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				createdb dbname
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 *
 *****************************************************************************/

1734
CreatedbStmt:  CREATE DATABASE database_name opt_database
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				{
					CreatedbStmt *n = makeNode(CreatedbStmt);
					n->dbname = $3;
1738
					n->dbpath = $4;
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					$$ = (Node *)n;
				}
		;
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opt_database:  WITH LOCATION '=' location		{ $$ = $4; }
		| /*EMPTY*/								{ $$ = NULL; }
		;

location:  Sconst								{ $$ = $1; }
		| DEFAULT								{ $$ = NULL; }
		| /*EMPTY*/								{ $$ = NULL; }
		;
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/*****************************************************************************
 *
1754 1755
 *		QUERY:
 *				destroydb dbname
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 *
 *****************************************************************************/

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DestroydbStmt:	DROP DATABASE database_name
				{
					DestroydbStmt *n = makeNode(DestroydbStmt);
					n->dbname = $3;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				cluster <index_name> on <relation_name>
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 *
 *****************************************************************************/

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ClusterStmt:  CLUSTER index_name ON relation_name
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				{
				   ClusterStmt *n = makeNode(ClusterStmt);
				   n->relname = $4;
				   n->indexname = $2;
				   $$ = (Node*)n;
				}
		;
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1784

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/*****************************************************************************
 *
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 *		QUERY:
 *				vacuum
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 *
 *****************************************************************************/

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VacuumStmt:  VACUUM opt_verbose opt_analyze
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				{
					VacuumStmt *n = makeNode(VacuumStmt);
					n->verbose = $2;
					n->analyze = $3;
					n->vacrel = NULL;
					n->va_spec = NIL;
					$$ = (Node *)n;
				}
		| VACUUM opt_verbose relation_name opt_analyze opt_va_list
				{
					VacuumStmt *n = makeNode(VacuumStmt);
					n->verbose = $2;
					n->analyze = $4;
					n->vacrel = $3;
					n->va_spec = $5;
					if ( $5 != NIL && !$4 )
1809
						elog(WARN,"parser: syntax error at or near \"(\"",NULL);
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					$$ = (Node *)n;
				}
		;

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opt_verbose:  VERBOSE							{ $$ = TRUE; }
		| /* EMPTY */							{ $$ = FALSE; }
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		;

1818 1819
opt_analyze:  ANALYZE							{ $$ = TRUE; }
		| /* EMPTY */							{ $$ = FALSE; }
1820
		;
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opt_va_list:  '(' va_list ')'
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				{ $$ = $2; }
		| /* EMPTY */
				{ $$ = NIL; }
		;
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va_list:  name
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				{ $$=lcons($1,NIL); }
		| va_list ',' name
				{ $$=lappend($1,$3); }
		;
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1834

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/*****************************************************************************
 *
1837 1838
 *		QUERY:
 *				EXPLAIN query
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 *
 *****************************************************************************/

1842
ExplainStmt:  EXPLAIN opt_verbose OptimizableStmt
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				{
					ExplainStmt *n = makeNode(ExplainStmt);
					n->verbose = $2;
					n->query = (Query*)$3;
					$$ = (Node *)n;
				}
		;
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1851

1852
/*****************************************************************************
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 *																			 *
 *		Optimizable Stmts:													 *
 *																			 *
 *		one of the five queries processed by the planner					 *
 *																			 *
 *		[ultimately] produces query-trees as specified						 *
 *		in the query-spec document in ~postgres/ref							 *
 *																			 *
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 *****************************************************************************/

OptimizableStmt:  RetrieveStmt
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		| CursorStmt
		| ReplaceStmt
		| AppendStmt
		| NotifyStmt
		| DeleteStmt					/* by default all are $$=$1 */
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				INSERT STATEMENTS
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 *
1877 1878 1879
 *****************************************************************************/

AppendStmt:  INSERT INTO relation_name opt_column_list insert_rest
1880 1881 1882 1883 1884 1885
				{
					$5->relname = $3;
					$5->cols = $4;
					$$ = (Node *)$5;
				}
		;
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1887
insert_rest:  VALUES '(' res_target_list2 ')'
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				{
					$$ = makeNode(AppendStmt);
					$$->targetList = $3;
					$$->fromClause = NIL;
					$$->whereClause = NULL;
				}
		| SELECT res_target_list2 from_clause where_clause
				{
					$$ = makeNode(AppendStmt);
					$$->targetList = $2;
					$$->fromClause = $3;
					$$->whereClause = $4;
				}
		;

1903
opt_column_list:  '(' columnList ')'			{ $$ = $2; }
1904 1905
		| /*EMPTY*/								{ $$ = NIL; }
		;
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1907
columnList:
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		  columnList ',' columnElem
				{ $$ = lappend($1, $3); }
		| columnElem
				{ $$ = lcons($1, NIL); }
		;
1913

1914
columnElem:  ColId opt_indirection
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				{
					Ident *id = makeNode(Ident);
					id->name = $1;
					id->indirection = $2;
					$$ = (Node *)id;
				}
		;
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1923

1924 1925
/*****************************************************************************
 *
1926 1927
 *		QUERY:
 *				DELETE STATEMENTS
1928 1929
 *
 *****************************************************************************/
1930

1931
DeleteStmt:  DELETE FROM relation_name
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			 where_clause
				{
					DeleteStmt *n = makeNode(DeleteStmt);
					n->relname = $3;
					n->whereClause = $4;
					$$ = (Node *)n;
				}
		;
1940 1941 1942 1943


/*****************************************************************************
 *
1944 1945
 *		QUERY:
 *				ReplaceStmt (UPDATE)
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 *
 *****************************************************************************/

1949
ReplaceStmt:  UPDATE relation_name
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			  SET res_target_list
			  from_clause
			  where_clause
				{
					ReplaceStmt *n = makeNode(ReplaceStmt);
					n->relname = $2;
					n->targetList = $4;
					n->fromClause = $5;
					n->whereClause = $6;
					$$ = (Node *)n;
				}
		;
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1963 1964 1965

/*****************************************************************************
 *
1966 1967
 *		QUERY:
 *				CURSOR STATEMENTS
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 *
 *****************************************************************************/

1971
CursorStmt:  DECLARE name opt_binary CURSOR FOR
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			 SELECT opt_unique res_target_list2
			 from_clause where_clause group_clause sort_clause
				{
					CursorStmt *n = makeNode(CursorStmt);

					/* from PORTAL name */
					/*
					 *	15 august 1991 -- since 3.0 postgres does locking
					 *	right, we discovered that portals were violating
					 *	locking protocol.  portal locks cannot span xacts.
					 *	as a short-term fix, we installed the check here.
					 *							-- mao
					 */
					if (!IsTransactionBlock())
1986
						elog(WARN,"Named portals may only be used in begin/end transaction blocks",NULL);
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					n->portalname = $2;
					n->binary = $3;
					n->unique = $7;
					n->targetList = $8;
					n->fromClause = $9;
					n->whereClause = $10;
					n->groupClause = $11;
					n->sortClause = $12;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
2003 2004
 *		QUERY:
 *				SELECT STATEMENTS
2005 2006 2007 2008
 *
 *****************************************************************************/

RetrieveStmt:  SELECT opt_unique res_target_list2
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			 result from_clause where_clause
			 group_clause having_clause
			 union_clause sort_clause
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				{
					RetrieveStmt *n = makeNode(RetrieveStmt);
					n->unique = $2;
					n->targetList = $3;
					n->into = $4;
					n->fromClause = $5;
					n->whereClause = $6;
					n->groupClause = $7;
					n->havingClause = $8;
					n->selectClause = $9;
					n->sortClause = $10;
					$$ = (Node *)n;
				}
		;

2027
union_clause:  UNION opt_union select_list		{ $$ = $3; }
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		| /*EMPTY*/								{ $$ = NIL; }
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		;
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select_list:  select_list UNION opt_union SubSelect
				{ $$ = lappend($1, $4); }
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		| SubSelect
				{ $$ = lcons($1, NIL); }
		;

SubSelect:	SELECT opt_unique res_target_list2
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			 from_clause where_clause
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			 group_clause having_clause
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				{
					SubSelect *n = makeNode(SubSelect);
					n->unique = $2;
					n->targetList = $3;
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					n->fromClause = $4;
					n->whereClause = $5;
					n->groupClause = $6;
					n->havingClause = $7;
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					$$ = (Node *)n;
				}
		;
2051

2052
result:  INTO TABLE relation_name
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Bruce Momjian committed
2053
				{  $$= $3; }
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		| /*EMPTY*/
				{  $$ = NULL;  }
		;
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opt_union:  ALL									{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
		;

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opt_unique:  DISTINCT							{ $$ = "*"; }
		| DISTINCT ON ColId						{ $$ = $3; }
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		| ALL									{ $$ = NULL; }
		| /*EMPTY*/								{ $$ = NULL; }
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		;
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sort_clause:  ORDER BY sortby_list				{ $$ = $3; }
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		| /*EMPTY*/								{ $$ = NIL; }
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		;
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sortby_list:  sortby							{ $$ = lcons($1, NIL); }
		| sortby_list ',' sortby				{ $$ = lappend($1, $3); }
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		;
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sortby:  ColId OptUseOp
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				{
					$$ = makeNode(SortGroupBy);
					$$->resno = 0;
					$$->range = NULL;
					$$->name = $1;
					$$->useOp = $2;
				}
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		| ColId '.' ColId OptUseOp
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				{
					$$ = makeNode(SortGroupBy);
					$$->resno = 0;
					$$->range = $1;
					$$->name = $3;
					$$->useOp = $4;
				}
		| Iconst OptUseOp
				{
					$$ = makeNode(SortGroupBy);
					$$->resno = $1;
					$$->range = NULL;
					$$->name = NULL;
					$$->useOp = $2;
				}
		;

OptUseOp:  USING Op								{ $$ = $2; }
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		| USING '<'								{ $$ = "<"; }
		| USING '>'								{ $$ = ">"; }
		| ASC									{ $$ = "<"; }
		| DESC									{ $$ = ">"; }
		| /*EMPTY*/								{ $$ = "<"; /*default*/ }
2108
		;
2109 2110

/*
2111 2112
 *	jimmy bell-style recursive queries aren't supported in the
 *	current system.
2113
 *
2114 2115
 *	...however, recursive addattr and rename supported.  make special
 *	cases for these.
2116
 *
2117
 *	XXX i believe '*' should be the default behavior, but...
2118
 */
2119 2120
opt_inh_star:  '*'								{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
2121
		;
2122

2123
relation_name_list:  name_list;
2124

2125
name_list:  name
2126
				{	$$ = lcons(makeString($1),NIL); }
2127
		| name_list ',' name
2128
				{	$$ = lappend($1,makeString($3)); }
2129
		;
2130

2131
group_clause:  GROUP BY groupby_list			{ $$ = $3; }
2132 2133
		| /*EMPTY*/								{ $$ = NIL; }
		;
2134

2135
groupby_list:  groupby							{ $$ = lcons($1, NIL); }
2136 2137
		| groupby_list ',' groupby				{ $$ = lappend($1, $3); }
		;
2138

2139
groupby:  ColId
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				{
					$$ = makeNode(SortGroupBy);
					$$->resno = 0;
					$$->range = NULL;
					$$->name = $1;
					$$->useOp = NULL;
				}
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		| ColId '.' ColId
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				{
					$$ = makeNode(SortGroupBy);
					$$->resno = 0;
					$$->range = $1;
					$$->name = $3;
					$$->useOp = NULL;
				}
		| Iconst
				{
					$$ = makeNode(SortGroupBy);
					$$->resno = $1;
					$$->range = NULL;
					$$->name = NULL;
					$$->useOp = NULL;
				}
		;

2165
having_clause:  HAVING a_expr					{ $$ = $2; }
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		| /*EMPTY*/								{ $$ = NULL; }
		;
2168

2169

2170
/*****************************************************************************
2171
 *
2172 2173 2174
 *	clauses common to all Optimizable Stmts:
 *		from_clause		-
 *		where_clause	-
2175
 *
2176 2177
 *****************************************************************************/

2178
from_clause:  FROM '(' relation_expr join_expr JOIN relation_expr join_spec ')'
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				{
					$$ = NIL;
					elog(WARN,"JOIN not yet implemented",NULL);
				}
		| FROM from_list						{ $$ = $2; }
		| /*EMPTY*/								{ $$ = NIL; }
		;

from_list:	from_list ',' from_val
				{ $$ = lappend($1, $3); }
2189
		| from_val CROSS JOIN from_val
2190
				{ elog(WARN,"CROSS JOIN not yet implemented",NULL); }
2191
		| from_val
2192 2193
				{ $$ = lcons($1, NIL); }
		;
2194

2195
from_val:  relation_expr AS ColLabel
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				{
					$$ = makeNode(RangeVar);
					$$->relExpr = $1;
					$$->name = $3;
				}
2201
		| relation_expr ColId
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				{
					$$ = makeNode(RangeVar);
					$$->relExpr = $1;
					$$->name = $2;
				}
		| relation_expr
				{
					$$ = makeNode(RangeVar);
					$$->relExpr = $1;
					$$->name = NULL;
				}
		;
2214

2215
join_expr:  NATURAL join_expr					{ $$ = NULL; }
2216
		| FULL join_outer
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				{ elog(WARN,"FULL OUTER JOIN not yet implemented",NULL); }
		| LEFT join_outer
				{ elog(WARN,"LEFT OUTER JOIN not yet implemented",NULL); }
		| RIGHT join_outer
				{ elog(WARN,"RIGHT OUTER JOIN not yet implemented",NULL); }
2222
		| OUTER_P
2223
				{ elog(WARN,"OUTER JOIN not yet implemented",NULL); }
2224
		| INNER_P
2225 2226 2227
				{ elog(WARN,"INNER JOIN not yet implemented",NULL); }
		| UNION
				{ elog(WARN,"UNION JOIN not yet implemented",NULL); }
2228 2229
		| /*EMPTY*/
				{ elog(WARN,"INNER JOIN not yet implemented",NULL); }
2230 2231
		;

2232 2233
join_outer:  OUTER_P							{ $$ = NULL; }
		| /*EMPTY*/								{ $$ = NULL;  /* no qualifiers */ }
2234 2235
		;

2236 2237 2238
join_spec:	ON '(' a_expr ')'					{ $$ = NULL; }
		| USING '(' join_list ')'				{ $$ = NULL; }
		| /*EMPTY*/								{ $$ = NULL;  /* no qualifiers */ }
2239 2240
		;

2241
join_list:  join_using							{ $$ = lcons($1, NIL); }
2242 2243
		| join_list ',' join_using				{ $$ = lappend($1, $3); }
		;
2244

2245
join_using:  ColId
2246 2247 2248 2249 2250 2251 2252
				{
					$$ = makeNode(SortGroupBy);
					$$->resno = 0;
					$$->range = NULL;
					$$->name = $1;
					$$->useOp = NULL;
				}
2253
		| ColId '.' ColId
2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270
				{
					$$ = makeNode(SortGroupBy);
					$$->resno = 0;
					$$->range = $1;
					$$->name = $3;
					$$->useOp = NULL;
				}
		| Iconst
				{
					$$ = makeNode(SortGroupBy);
					$$->resno = $1;
					$$->range = NULL;
					$$->name = NULL;
					$$->useOp = NULL;
				}
		;

2271 2272
where_clause:  WHERE a_expr						{ $$ = $2; }
		| /*EMPTY*/								{ $$ = NULL;  /* no qualifiers */ }
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288
		;

relation_expr:	relation_name
				{
					/* normal relations */
					$$ = makeNode(RelExpr);
					$$->relname = $1;
					$$->inh = FALSE;
				}
		| relation_name '*'				  %prec '='
				{
					/* inheiritance query */
					$$ = makeNode(RelExpr);
					$$->relname = $1;
					$$->inh = TRUE;
				}
2289 2290

opt_array_bounds:  '[' ']' nest_array_bounds
2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304
				{  $$ = lcons(makeInteger(-1), $3); }
		| '[' Iconst ']' nest_array_bounds
				{  $$ = lcons(makeInteger($2), $4); }
		| /* EMPTY */
				{  $$ = NIL; }
		;

nest_array_bounds:	'[' ']' nest_array_bounds
				{  $$ = lcons(makeInteger(-1), $3); }
		| '[' Iconst ']' nest_array_bounds
				{  $$ = lcons(makeInteger($2), $4); }
		| /*EMPTY*/
				{  $$ = NIL; }
		;
2305

2306

2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320
/*****************************************************************************
 *
 *	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
 *
 *****************************************************************************/

Typename:  Array opt_array_bounds
				{
					$$ = $1;
					$$->arrayBounds = $2;
2321 2322 2323 2324

					/* Is this the name of a complex type? If so, implement
					 * it as a set.
					 */
2325
					if (!strcmp(saved_relname, $$->name))
2326 2327 2328 2329 2330
						/* This attr is the same type as the relation
						 * being defined. The classic example: create
						 * emp(name=text,mgr=emp)
						 */
						$$->setof = TRUE;
2331
					else if (typeTypeRelid(typenameType($$->name)) != InvalidOid)
2332 2333 2334 2335 2336 2337 2338
						 /* (Eventually add in here that the set can only
						  * contain one element.)
						  */
						$$->setof = TRUE;
					else
						$$->setof = FALSE;
				}
2339 2340
		| Character
		| SETOF Array
2341
				{
2342
					$$ = $2;
2343 2344 2345 2346
					$$->setof = TRUE;
				}
		;

2347 2348 2349
Array:  Generic
		| Datetime
		| Numeric
2350
		;
2351

2352
Generic:  generic
2353
				{
2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType($1);
				}
		;

generic:  Id									{ $$ = $1; }
		| TYPE_P								{ $$ = xlateSqlType("type"); }
		| DOUBLE PRECISION						{ $$ = xlateSqlType("float8"); }
		;

/* SQL92 numeric data types
 * Check FLOAT() precision limits assuming IEEE floating types.
 * Provide rudimentary DECIMAL() and NUMERIC() implementations
 *  by checking parameters and making sure they match what is possible with INTEGER.
 * - thomas 1997-09-18
 */
Numeric:  FLOAT opt_float
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType($2);
2374
				}
2375
		| DECIMAL opt_decimal
2376
				{
2377
					$$ = makeNode(TypeName);
2378 2379 2380 2381 2382 2383 2384 2385
					$$->name = xlateSqlType("integer");
				}
		| NUMERIC opt_numeric
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType("integer");
				}
		;
2386

2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464
opt_float:  '(' Iconst ')'
				{
					if ($2 < 1)
						elog(WARN,"precision for FLOAT must be at least 1",NULL);
					else if ($2 < 7)
						$$ = xlateSqlType("float4");
					else if ($2 < 16)
						$$ = xlateSqlType("float8");
					else
						elog(WARN,"precision for FLOAT must be less than 16",NULL);
				}
		| /*EMPTY*/
				{
					$$ = xlateSqlType("float8");
				}
		;

opt_numeric:  '(' Iconst ',' Iconst ')'
				{
					if ($2 != 9)
						elog(WARN,"NUMERIC precision %d must be 9",$2);
					if ($4 != 0)
						elog(WARN,"NUMERIC scale %d must be zero",$4);
				}
		| '(' Iconst ')'
				{
					if ($2 != 9)
						elog(WARN,"NUMERIC precision %d must be 9",$2);
				}
		| /*EMPTY*/
				{
					$$ = NULL;
				}
		;

opt_decimal:  '(' Iconst ',' Iconst ')'
				{
					if ($2 > 9)
						elog(WARN,"DECIMAL precision %d exceeds implementation limit of 9",$2);
					if ($4 != 0)
						elog(WARN,"DECIMAL scale %d must be zero",$4);
					$$ = NULL;
				}
		| '(' Iconst ')'
				{
					if ($2 > 9)
						elog(WARN,"DECIMAL precision %d exceeds implementation limit of 9",$2);
					$$ = NULL;
				}
		| /*EMPTY*/
				{
					$$ = NULL;
				}
		;

/* SQL92 character data types
 * The following implements CHAR() and VARCHAR().
 * We do it here instead of the 'Generic' production
 * because we don't want to allow arrays of VARCHAR().
 * I haven't thought about whether that will work or not.
 *								- ay 6/95
 */
Character:  character '(' Iconst ')'
				{
					$$ = makeNode(TypeName);
					if (!strcasecmp($1, "char"))
						$$->name = xlateSqlType("bpchar");
					else if (!strcasecmp($1, "varchar"))
						$$->name = xlateSqlType("varchar");
					else
						yyerror("parse error");
					if ($3 < 1)
						elog(WARN,"length for '%s' type must be at least 1",$1);
					else if ($3 > 4096)
						/* we can store a char() of length up to the size
						 * of a page (8KB) - page headers and friends but
						 * just to be safe here...	- ay 6/95
						 * XXX note this hardcoded limit - thomas 1997-07-13
2465
						 */
2466 2467 2468 2469 2470 2471 2472 2473
						elog(WARN,"length for type '%s' cannot exceed 4096",$1);

					/* we actually implement this sort of like a varlen, so
					 * the first 4 bytes is the length. (the difference
					 * between this and "text" is that we blank-pad and
					 * truncate where necessary
					 */
					$$->typlen = 4 + $3;
2474
				}
2475
		| character
2476 2477
				{
					$$ = makeNode(TypeName);
2478 2479 2480
					$$->name = xlateSqlType($1);
				}
		;
2481

2482 2483 2484 2485 2486 2487
character:  CHARACTER opt_varying opt_charset opt_collate
				{
					char *type, *c;
					if (($3 == NULL) || (strcasecmp($3, "sql_text") == 0)) {
						if ($2) type = xlateSqlType("varchar");
						else type = xlateSqlType("char");
2488
					} else {
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539
						if ($2) {
							c = palloc(strlen("var") + strlen($3) + 1);
							strcpy(c, "var");
							strcat(c, $3);
							type = xlateSqlType(c);
						} else {
							type = xlateSqlType($3);
						}
					};
					if ($4 != NULL)
					elog(WARN,"COLLATE %s not yet implemented",$4);
					$$ = type;
				}
		| CHAR opt_varying						{ $$ = xlateSqlType($2? "varchar": "char"); }
		| VARCHAR								{ $$ = xlateSqlType("varchar"); }
		| NATIONAL CHARACTER opt_varying		{ $$ = xlateSqlType($3? "varchar": "char"); }
		| NCHAR opt_varying						{ $$ = xlateSqlType($2? "varchar": "char"); }
		;

opt_varying:  VARYING							{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
		;

opt_charset:  CHARACTER SET ColId				{ $$ = $3; }
		| /*EMPTY*/								{ $$ = NULL; }
		;

opt_collate:  COLLATE ColId						{ $$ = $2; }
		| /*EMPTY*/								{ $$ = NULL; }
		;

Datetime:  datetime
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType($1);
				}
		| TIMESTAMP opt_timezone
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType("timestamp");
					$$->timezone = $2;
				}
		| TIME
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType("time");
				}
		| INTERVAL opt_interval
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType("interval");
2540
				}
2541
		;
2542

2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564
datetime:  YEAR_P								{ $$ = "year"; }
		| MONTH_P								{ $$ = "month"; }
		| DAY_P									{ $$ = "day"; }
		| HOUR_P								{ $$ = "hour"; }
		| MINUTE_P								{ $$ = "minute"; }
		| SECOND_P								{ $$ = "second"; }
		;

opt_timezone:  WITH TIME ZONE					{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
		;

opt_interval:  datetime							{ $$ = lcons($1, NIL); }
		| YEAR_P TO MONTH_P						{ $$ = NIL; }
		| DAY_P TO HOUR_P						{ $$ = NIL; }
		| DAY_P TO MINUTE_P						{ $$ = NIL; }
		| DAY_P TO SECOND_P						{ $$ = NIL; }
		| HOUR_P TO MINUTE_P					{ $$ = NIL; }
		| HOUR_P TO SECOND_P					{ $$ = NIL; }
		| /* EMPTY */							{ $$ = NIL; }
		;

2565 2566 2567

/*****************************************************************************
 *
2568
 *	expression grammar, still needs some cleanup
2569 2570 2571
 *
 *****************************************************************************/

2572
a_expr_or_null:  a_expr
2573 2574 2575 2576 2577 2578 2579
				{ $$ = $1;}
		| Pnull
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Null;
					$$ = (Node *)n;
				}
2580

2581
a_expr:  attr opt_indirection
2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618
				{
					$1->indirection = $2;
					$$ = (Node *)$1;
				}
		| AexprConst
				{	$$ = $1;  }
		| '-' a_expr %prec UMINUS
				{	$$ = makeA_Expr(OP, "-", NULL, $2); }
		| a_expr '+' a_expr
				{	$$ = makeA_Expr(OP, "+", $1, $3); }
		| a_expr '-' a_expr
				{	$$ = makeA_Expr(OP, "-", $1, $3); }
		| a_expr '/' a_expr
				{	$$ = makeA_Expr(OP, "/", $1, $3); }
		| a_expr '*' a_expr
				{	$$ = makeA_Expr(OP, "*", $1, $3); }
		| a_expr '<' a_expr
				{	$$ = makeA_Expr(OP, "<", $1, $3); }
		| a_expr '>' a_expr
				{	$$ = makeA_Expr(OP, ">", $1, $3); }
		| a_expr '=' a_expr
				{	$$ = makeA_Expr(OP, "=", $1, $3); }
		| ':' a_expr
				{	$$ = makeA_Expr(OP, ":", NULL, $2); }
		| ';' a_expr
				{	$$ = makeA_Expr(OP, ";", NULL, $2); }
		| '|' a_expr
				{	$$ = makeA_Expr(OP, "|", NULL, $2); }
		| AexprConst TYPECAST Typename
				{
					/* AexprConst can be either A_Const or ParamNo */
					if (nodeTag($1) == T_A_Const)
						((A_Const *)$1)->typename = $3;
					else
						((ParamNo *)$1)->typename = $3;
					$$ = (Node *)$1;
				}
2619
		| CAST a_expr AS Typename
2620
				{
2621
					$$ = (Node *)$2;
2622
					/* AexprConst can be either A_Const or ParamNo */
2623
					if (nodeTag($2) == T_A_Const) {
2624
						((A_Const *)$2)->typename = $4;
2625
					} else if (nodeTag($2) == T_Param) {
2626
						((ParamNo *)$2)->typename = $4;
2627 2628 2629 2630 2631 2632 2633
					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
						n->funcname = $4->name;
						n->args = lcons($2,NIL);
						$$ = (Node *)n;
					}
2634 2635 2636 2637
				}
		| '(' a_expr_or_null ')'
				{	$$ = $2; }
		| a_expr Op a_expr
2638
				{	$$ = makeIndexable($2,$1,$3);	}
2639
		| a_expr LIKE a_expr
2640
				{	$$ = makeIndexable("~~", $1, $3); }
2641 2642 2643 2644 2645 2646
		| a_expr NOT LIKE a_expr
				{	$$ = makeA_Expr(OP, "!~~", $1, $4); }
		| Op a_expr
				{	$$ = makeA_Expr(OP, $1, NULL, $2); }
		| a_expr Op
				{	$$ = makeA_Expr(OP, $2, $1, NULL); }
2647
		| ColId
2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670
				{
					/* could be a column name or a relation_name */
					Ident *n = makeNode(Ident);
					n->name = $1;
					n->indirection = NULL;
					$$ = (Node *)n;
				}
		| name '(' '*' ')'
				{
					FuncCall *n = makeNode(FuncCall);
					Ident *star = makeNode(Ident);

					/* cheap hack for aggregate (eg. count) */
					star->name = "oid";
					n->funcname = $1;
					n->args = lcons(star, NIL);
					$$ = (Node *)n;
				}
		| name '(' ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700
					$$ = (Node *)n;
				}
		| CURRENT_DATE
				{
					A_Const *n = makeNode(A_Const);
					TypeName *t = makeNode(TypeName);

					n->val.type = T_String;
					n->val.val.str = "now";
					n->typename = t;

					t->name = xlateSqlType("date");
					t->setof = FALSE;

					$$ = (Node *)n;
				}
		| CURRENT_TIME
				{
					A_Const *n = makeNode(A_Const);
					TypeName *t = makeNode(TypeName);

					n->val.type = T_String;
					n->val.val.str = "now";
					n->typename = t;

					t->name = xlateSqlType("time");
					t->setof = FALSE;

					$$ = (Node *)n;
				}
2701
		| CURRENT_TIME '(' Iconst ')'
2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716
				{
					FuncCall *n = makeNode(FuncCall);
					A_Const *s = makeNode(A_Const);
					TypeName *t = makeNode(TypeName);

					n->funcname = xlateSqlType("time");
					n->args = lcons(s, NIL);

					s->val.type = T_String;
					s->val.val.str = "now";
					s->typename = t;

					t->name = xlateSqlType("time");
					t->setof = FALSE;

2717 2718
					if ($3 != 0)
						elog(NOTICE,"CURRENT_TIME(p) precision must be zero",NULL);
2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735

					$$ = (Node *)n;
				}
		| CURRENT_TIMESTAMP
				{
					A_Const *n = makeNode(A_Const);
					TypeName *t = makeNode(TypeName);

					n->val.type = T_String;
					n->val.val.str = "now";
					n->typename = t;

					t->name = xlateSqlType("timestamp");
					t->setof = FALSE;

					$$ = (Node *)n;
				}
2736
		| CURRENT_TIMESTAMP '(' Iconst ')'
2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751
				{
					FuncCall *n = makeNode(FuncCall);
					A_Const *s = makeNode(A_Const);
					TypeName *t = makeNode(TypeName);

					n->funcname = xlateSqlType("timestamp");
					n->args = lcons(s, NIL);

					s->val.type = T_String;
					s->val.val.str = "now";
					s->typename = t;

					t->name = xlateSqlType("timestamp");
					t->setof = FALSE;

2752 2753
					if ($3 != 0)
						elog(NOTICE,"CURRENT_TIMESTAMP(p) precision must be zero",NULL);
2754

2755 2756
					$$ = (Node *)n;
				}
2757
		| CURRENT_USER
2758 2759 2760 2761 2762 2763
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "getpgusername";
					n->args = NIL;
					$$ = (Node *)n;
				}
2764 2765 2766 2767 2768 2769 2770
		/* We probably need to define an "exists" node,
		 *	since the optimizer could choose to find only one match.
		 * Perhaps the first implementation could just check for
		 *	count(*) > 0? - thomas 1997-07-19
		 */
		| EXISTS '(' SubSelect ')'
				{
2771
					elog(WARN,"EXISTS not yet implemented",NULL);
2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832
					$$ = $3;
				}
		| EXTRACT '(' extract_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "date_part";
					n->args = $3;
					$$ = (Node *)n;
				}
		| POSITION '(' position_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "strpos";
					n->args = $3;
					$$ = (Node *)n;
				}
		| SUBSTRING '(' substr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "substr";
					n->args = $3;
					$$ = (Node *)n;
				}
		/* various trim expressions are defined in SQL92 - thomas 1997-07-19 */
		| TRIM '(' BOTH trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "btrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' LEADING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "ltrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' TRAILING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "rtrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "btrim";
					n->args = $3;
					$$ = (Node *)n;
				}
		| name '(' expr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					$$ = (Node *)n;
				}
		| a_expr ISNULL
				{	$$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
2833
		| a_expr IS NULL_P
2834 2835 2836
				{	$$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
		| a_expr NOTNULL
				{	$$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
2837
		| a_expr IS NOT NULL_P
2838
				{	$$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
2839 2840
		| a_expr IS TRUE_P
				{
2841 2842 2843 2844
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "istrue";
					n->args = lcons($1,NIL);
					$$ = (Node *)n;
2845 2846 2847
				}
		| a_expr IS FALSE_P
				{
2848 2849 2850 2851
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "isfalse";
					n->args = lcons($1,NIL);
					$$ = (Node *)n;
2852 2853 2854
				}
		| a_expr IS NOT TRUE_P
				{
2855 2856 2857 2858
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "isfalse";
					n->args = lcons($1,NIL);
					$$ = (Node *)n;
2859 2860 2861
				}
		| a_expr IS NOT FALSE_P
				{
2862 2863 2864 2865
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "istrue";
					n->args = lcons($1,NIL);
					$$ = (Node *)n;
2866
				}
2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878
		| a_expr BETWEEN AexprConst AND AexprConst
				{
					$$ = makeA_Expr(AND, NULL,
						makeA_Expr(OP, ">=", $1, $3),
						makeA_Expr(OP, "<=", $1, $5));
				}
		| a_expr NOT BETWEEN AexprConst AND AexprConst
				{
					$$ = makeA_Expr(OR, NULL,
						makeA_Expr(OP, "<", $1, $4),
						makeA_Expr(OP, ">", $1, $6));
				}
2879
		| a_expr IN { saved_In_Expr = $1; } '(' in_expr ')'
2880
				{	$$ = $5; }
2881
		| a_expr NOT IN { saved_In_Expr = $1; } '(' not_in_expr ')'
2882 2883 2884 2885 2886 2887 2888 2889
				{	$$ = $6; }
		| a_expr AND a_expr
				{	$$ = makeA_Expr(AND, NULL, $1, $3); }
		| a_expr OR a_expr
				{	$$ = makeA_Expr(OR, NULL, $1, $3); }
		| NOT a_expr
				{	$$ = makeA_Expr(NOT, NULL, NULL, $2); }
		;
2890

2891
opt_indirection:  '[' a_expr ']' opt_indirection
2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907
				{
					A_Indices *ai = makeNode(A_Indices);
					ai->lidx = NULL;
					ai->uidx = $2;
					$$ = lcons(ai, $4);
				}
		| '[' a_expr ':' a_expr ']' opt_indirection
				{
					A_Indices *ai = makeNode(A_Indices);
					ai->lidx = $2;
					ai->uidx = $4;
					$$ = lcons(ai, $6);
				}
		| /* EMPTY */
				{	$$ = NIL; }
		;
2908

2909
expr_list:  a_expr_or_null
2910
				{ $$ = lcons($1, NIL); }
2911
		| expr_list ',' a_expr_or_null
2912
				{ $$ = lappend($1, $3); }
2913
		| expr_list USING a_expr
2914 2915
				{ $$ = lappend($1, $3); }
		;
2916

2917
extract_list:  datetime FROM a_expr
2918 2919 2920 2921 2922 2923 2924 2925 2926
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = $1;
					$$ = lappend(lcons((Node *)n,NIL), $3);
				}
		| /* EMPTY */
				{	$$ = NIL; }
		;
2927

2928
position_list:  position_expr IN position_expr
2929
				{	$$ = makeList($3, $1, -1); }
2930 2931 2932
		| /* EMPTY */
				{	$$ = NIL; }
		;
2933

2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961
position_expr:  attr opt_indirection
				{
					$1->indirection = $2;
					$$ = (Node *)$1;
				}
		| AexprConst
				{	$$ = $1;  }
		| '-' position_expr %prec UMINUS
				{	$$ = makeA_Expr(OP, "-", NULL, $2); }
		| position_expr '+' position_expr
				{	$$ = makeA_Expr(OP, "+", $1, $3); }
		| position_expr '-' position_expr
				{	$$ = makeA_Expr(OP, "-", $1, $3); }
		| position_expr '/' position_expr
				{	$$ = makeA_Expr(OP, "/", $1, $3); }
		| position_expr '*' position_expr
				{	$$ = makeA_Expr(OP, "*", $1, $3); }
		| '|' position_expr
				{	$$ = makeA_Expr(OP, "|", NULL, $2); }
		| AexprConst TYPECAST Typename
				{
					/* AexprConst can be either A_Const or ParamNo */
					if (nodeTag($1) == T_A_Const)
						((A_Const *)$1)->typename = $3;
					else
						((ParamNo *)$1)->typename = $3;
					$$ = (Node *)$1;
				}
2962
		| CAST position_expr AS Typename
2963
				{
2964
					$$ = (Node *)$2;
2965
					/* AexprConst can be either A_Const or ParamNo */
2966
					if (nodeTag($2) == T_A_Const) {
2967
						((A_Const *)$2)->typename = $4;
2968
					} else if (nodeTag($2) == T_Param) {
2969
						((ParamNo *)$2)->typename = $4;
2970 2971 2972 2973 2974 2975 2976
					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
						n->funcname = $4->name;
						n->args = lcons($2,NIL);
						$$ = (Node *)n;
					}
2977 2978 2979 2980 2981 2982 2983 2984 2985
				}
		| '(' position_expr ')'
				{	$$ = $2; }
		| position_expr Op position_expr
				{	$$ = makeA_Expr(OP, $2, $1, $3); }
		| Op position_expr
				{	$$ = makeA_Expr(OP, $1, NULL, $2); }
		| position_expr Op
				{	$$ = makeA_Expr(OP, $2, $1, NULL); }
2986
		| ColId
2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052
				{
					/* could be a column name or a relation_name */
					Ident *n = makeNode(Ident);
					n->name = $1;
					n->indirection = NULL;
					$$ = (Node *)n;
				}
		| name '(' ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
					$$ = (Node *)n;
				}
		| POSITION '(' position_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "strpos";
					n->args = $3;
					$$ = (Node *)n;
				}
		| SUBSTRING '(' substr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "substr";
					n->args = $3;
					$$ = (Node *)n;
				}
		/* various trim expressions are defined in SQL92 - thomas 1997-07-19 */
		| TRIM '(' BOTH trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "btrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' LEADING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "ltrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' TRAILING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "rtrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "btrim";
					n->args = $3;
					$$ = (Node *)n;
				}
		| name '(' expr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					$$ = (Node *)n;
				}
		;

3053
substr_list:  expr_list substr_from substr_for
3054
				{
3055
					$$ = nconc(nconc($1,$2),$3);
3056 3057 3058 3059
				}
		| /* EMPTY */
				{	$$ = NIL; }
		;
3060

3061
substr_from:  FROM expr_list
3062 3063
				{	$$ = $2; }
		| /* EMPTY */
3064 3065 3066 3067 3068 3069
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Integer;
					n->val.val.ival = 1;
					$$ = lcons((Node *)n,NIL);
				}
3070
		;
3071

3072
substr_for:  FOR expr_list
3073 3074 3075 3076
				{	$$ = $2; }
		| /* EMPTY */
				{	$$ = NIL; }
		;
3077

3078
trim_list:  a_expr FROM expr_list
3079
				{ $$ = lappend($3, $1); }
3080
		| FROM expr_list
3081
				{ $$ = $2; }
3082
		| expr_list
3083 3084
				{ $$ = $1; }
		;
3085

3086 3087 3088 3089 3090 3091 3092 3093 3094
in_expr:  SubSelect
				{
					elog(WARN,"IN (SUBSELECT) not yet implemented",NULL);
					$$ = $1;
				}
		| in_expr_nodes
				{	$$ = $1; }
		;

3095
in_expr_nodes:  AexprConst
3096
				{	$$ = makeA_Expr(OP, "=", saved_In_Expr, $1); }
3097
		| in_expr_nodes ',' AexprConst
3098 3099 3100 3101
				{	$$ = makeA_Expr(OR, NULL, $1,
						makeA_Expr(OP, "=", saved_In_Expr, $3));
				}
		;
3102

3103 3104 3105 3106 3107 3108 3109 3110 3111
not_in_expr:  SubSelect
				{
					elog(WARN,"NOT IN (SUBSELECT) not yet implemented",NULL);
					$$ = $1;
				}
		| not_in_expr_nodes
				{	$$ = $1; }
		;

3112
not_in_expr_nodes:  AexprConst
3113
				{	$$ = makeA_Expr(OP, "<>", saved_In_Expr, $1); }
3114
		| not_in_expr_nodes ',' AexprConst
3115 3116 3117 3118
				{	$$ = makeA_Expr(AND, NULL, $1,
						makeA_Expr(OP, "<>", saved_In_Expr, $3));
				}
		;
3119

3120
attr:  relation_name '.' attrs
3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145
				{
					$$ = makeNode(Attr);
					$$->relname = $1;
					$$->paramNo = NULL;
					$$->attrs = $3;
					$$->indirection = NULL;
				}
		| ParamNo '.' attrs
				{
					$$ = makeNode(Attr);
					$$->relname = NULL;
					$$->paramNo = $1;
					$$->attrs = $3;
					$$->indirection = NULL;
				}
		;

attrs:	  attr_name
				{ $$ = lcons(makeString($1), NIL); }
		| attrs '.' attr_name
				{ $$ = lappend($1, makeString($3)); }
		| attrs '.' '*'
				{ $$ = lappend($1, makeString("*")); }
		;

3146 3147 3148

/*****************************************************************************
 *
3149
 *	target lists
3150 3151 3152
 *
 *****************************************************************************/

3153
res_target_list:  res_target_list ',' res_target_el
3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170
				{	$$ = lappend($1,$3);  }
		| res_target_el
				{	$$ = lcons($1, NIL);  }
		| '*'
				{
					ResTarget *rt = makeNode(ResTarget);
					Attr *att = makeNode(Attr);
					att->relname = "*";
					att->paramNo = NULL;
					att->attrs = NULL;
					att->indirection = NIL;
					rt->name = NULL;
					rt->indirection = NULL;
					rt->val = (Node *)att;
					$$ = lcons(rt, NIL);
				}
		;
3171

3172
res_target_el:  ColId opt_indirection '=' a_expr_or_null
3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198
				{
					$$ = makeNode(ResTarget);
					$$->name = $1;
					$$->indirection = $2;
					$$->val = (Node *)$4;
				}
		| attr opt_indirection
				{
					$$ = makeNode(ResTarget);
					$$->name = NULL;
					$$->indirection = $2;
					$$->val = (Node *)$1;
				}
		| relation_name '.' '*'
				{
					Attr *att = makeNode(Attr);
					att->relname = $1;
					att->paramNo = NULL;
					att->attrs = lcons(makeString("*"), NIL);
					att->indirection = NIL;
					$$ = makeNode(ResTarget);
					$$->name = NULL;
					$$->indirection = NULL;
					$$->val = (Node *)att;
				}
		;
3199 3200 3201 3202 3203 3204

/*
** target list for select.
** should get rid of the other but is still needed by the defunct retrieve into
** and update (uses a subset)
*/
3205
res_target_list2:  res_target_list2 ',' res_target_el2
3206 3207 3208 3209
				{	$$ = lappend($1, $3);  }
		| res_target_el2
				{	$$ = lcons($1, NIL);  }
		;
3210 3211

/* AS is not optional because shift/red conflict with unary ops */
3212
res_target_el2:  a_expr_or_null AS ColLabel
3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251
				{
					$$ = makeNode(ResTarget);
					$$->name = $3;
					$$->indirection = NULL;
					$$->val = (Node *)$1;
				}
		| a_expr_or_null
				{
					$$ = makeNode(ResTarget);
					$$->name = NULL;
					$$->indirection = NULL;
					$$->val = (Node *)$1;
				}
		| relation_name '.' '*'
				{
					Attr *att = makeNode(Attr);
					att->relname = $1;
					att->paramNo = NULL;
					att->attrs = lcons(makeString("*"), NIL);
					att->indirection = NIL;
					$$ = makeNode(ResTarget);
					$$->name = NULL;
					$$->indirection = NULL;
					$$->val = (Node *)att;
				}
		| '*'
				{
					Attr *att = makeNode(Attr);
					att->relname = "*";
					att->paramNo = NULL;
					att->attrs = NULL;
					att->indirection = NIL;
					$$ = makeNode(ResTarget);
					$$->name = NULL;
					$$->indirection = NULL;
					$$->val = (Node *)att;
				}
		;

3252
opt_id:  ColId									{ $$ = $1; }
3253 3254 3255 3256 3257 3258
		| /* EMPTY */							{ $$ = NULL; }
		;

relation_name:	SpecialRuleRelation
				{
					$$ = $1;
3259
					StrNCpy(saved_relname, $1, NAMEDATALEN);
3260 3261 3262
				}
		| ColId
				{
3263
					/* disallow refs to variable system tables */
3264
					if (strcmp(LogRelationName, $1) == 0
3265
					   || strcmp(VariableRelationName, $1) == 0)
3266
						elog(WARN,"%s cannot be accessed by users",$1);
3267 3268
					else
						$$ = $1;
3269
					StrNCpy(saved_relname, $1, NAMEDATALEN);
3270 3271 3272
				}
		;

3273
database_name:			ColId			{ $$ = $1; };
3274 3275 3276
access_method:			Id				{ $$ = $1; };
attr_name:				ColId			{ $$ = $1; };
class:					Id				{ $$ = $1; };
3277
index_name:				ColId			{ $$ = $1; };
3278

3279 3280 3281 3282 3283
/* Functions
 * Include date/time keywords as SQL92 extension.
 * Include TYPE as a SQL92 unreserved keyword. - thomas 1997-10-05
 */
name:					ColId			{ $$ = $1; };
3284 3285 3286

file_name:				Sconst			{ $$ = $1; };
recipe_name:			Id				{ $$ = $1; };
3287

3288 3289 3290
/* Constants
 * Include TRUE/FALSE for SQL3 support. - thomas 1997-10-24
 */
3291
AexprConst:  Iconst
3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Integer;
					n->val.val.ival = $1;
					$$ = (Node *)n;
				}
		| FCONST
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Float;
					n->val.val.dval = $1;
					$$ = (Node *)n;
				}
		| Sconst
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = $1;
					$$ = (Node *)n;
				}
3312 3313 3314 3315 3316 3317 3318 3319
		| Typename Sconst
				{
					A_Const *n = makeNode(A_Const);
					n->typename = $1;
					n->val.type = T_String;
					n->val.val.str = $2;
					$$ = (Node *)n;
				}
3320 3321
		| ParamNo
				{	$$ = (Node *)$1;  }
3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335
		| TRUE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "t";
					$$ = (Node *)n;
				}
		| FALSE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "f";
					$$ = (Node *)n;
				}
3336
		;
3337 3338

ParamNo:  PARAM
3339 3340 3341 3342 3343
				{
					$$ = makeNode(ParamNo);
					$$->number = $1;
				}
		;
3344

3345
NumConst:  Iconst						{ $$ = makeInteger($1); }
3346
		| FCONST						{ $$ = makeFloat($1); }
3347
		;
3348

3349 3350
Iconst:  ICONST							{ $$ = $1; };
Sconst:  SCONST							{ $$ = $1; };
3351

3352 3353 3354 3355 3356
/* Column and type identifier
 * Does not include explicit datetime types
 *  since these must be decoupled in Typename syntax.
 * Use ColId for most identifiers. - thomas 1997-10-21
 */
3357
Id:  IDENT								{ $$ = $1; };
3358

3359 3360 3361
/* Column identifier
 * Include date/time keywords as SQL92 extension.
 * Include TYPE as a SQL92 unreserved keyword. - thomas 1997-10-05
3362 3363 3364 3365
 * Add other keywords. Note that as the syntax expands,
 *  some of these keywords will have to be removed from this
 *  list due to shift/reduce conflicts in yacc. If so, move
 *  down to the ColLabel entity. - thomas 1997-11-06
3366
 */
3367 3368
ColId:  Id								{ $$ = $1; }
		| datetime						{ $$ = $1; }
3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381
		| ACTION						{ $$ = "action"; }
		| DATABASE						{ $$ = "database"; }
		| DELIMITERS					{ $$ = "delimiters"; }
		| FUNCTION						{ $$ = "function"; }
		| INDEX							{ $$ = "index"; }
		| KEY							{ $$ = "key"; }
		| LANGUAGE						{ $$ = "language"; }
		| LOCATION						{ $$ = "location"; }
		| MATCH							{ $$ = "match"; }
		| OPERATOR						{ $$ = "operator"; }
		| OPTION						{ $$ = "option"; }
		| PRIVILEGES					{ $$ = "privileges"; }
		| RECIPE						{ $$ = "recipe"; }
3382
		| TIME							{ $$ = "time"; }
3383
		| TRIGGER						{ $$ = "trigger"; }
3384
		| TYPE_P						{ $$ = "type"; }
3385 3386
		| VERSION						{ $$ = "version"; }
		| ZONE							{ $$ = "zone"; }
3387 3388 3389 3390 3391 3392 3393 3394
		;

/* Column label
 * Allowed labels in "AS" clauses.
 * Include TRUE/FALSE SQL3 reserved words for Postgres backward
 *  compatibility. Cannot allow this for column names since the
 *  syntax would not distinguish between the constant value and
 *  a column name. - thomas 1997-10-24
3395 3396 3397
 * Add other keywords to this list. Note that they appear here
 *  rather than in ColId if there was a shift/reduce conflict
 *  when used as a full identifier. - thomas 1997-11-06
3398 3399
 */
ColLabel:  ColId						{ $$ = $1; }
3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411
		| ARCHIVE						{ $$ = "archive"; }
		| CLUSTER						{ $$ = "cluster"; }
		| CONSTRAINT					{ $$ = "constraint"; }
		| CROSS							{ $$ = "cross"; }
		| FOREIGN						{ $$ = "foreign"; }
		| GROUP							{ $$ = "group"; }
		| LOAD							{ $$ = "load"; }
		| ORDER							{ $$ = "order"; }
		| POSITION						{ $$ = "position"; }
		| PRECISION						{ $$ = "precision"; }
		| TABLE							{ $$ = "table"; }
		| TRANSACTION					{ $$ = "transaction"; }
3412 3413
		| TRUE_P						{ $$ = "true"; }
		| FALSE_P						{ $$ = "false"; }
3414
		;
3415 3416

SpecialRuleRelation:  CURRENT
3417 3418 3419 3420
				{
					if (QueryIsRule)
						$$ = "*CURRENT*";
					else
3421
						elog(WARN,"CURRENT used in non-rule query",NULL);
3422 3423 3424 3425 3426 3427
				}
		| NEW
				{
					if (QueryIsRule)
						$$ = "*NEW*";
					else
3428
						elog(WARN,"NEW used in non-rule query",NULL);
3429 3430
				}
		;
3431

3432 3433
Type:	TYPE_P;
Pnull:	NULL_P;
3434 3435 3436

%%

3437
static Node *makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr)
3438
{
3439 3440 3441 3442 3443 3444
	A_Expr *a = makeNode(A_Expr);
	a->oper = oper;
	a->opname = opname;
	a->lexpr = lexpr;
	a->rexpr = rexpr;
	return (Node *)a;
3445 3446
}

3447

3448 3449 3450 3451 3452
static Node *makeIndexable(char *opname, Node *lexpr, Node *rexpr)
{
	Node *result = NULL;

	/* we do this so indexes can be used */
3453 3454
	if (strcmp(opname,"~") == 0 ||
		strcmp(opname,"~*") == 0)
3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471
	{
		if (nodeTag(rexpr) == T_A_Const &&
		   ((A_Const *)rexpr)->val.type == T_String &&
		   ((A_Const *)rexpr)->val.val.str[0] == '^')
		{
			A_Const *n = (A_Const *)rexpr;
			char *match_least = palloc(strlen(n->val.val.str)+2);
			char *match_most = palloc(strlen(n->val.val.str)+2);
			int pos, match_pos=0;

			/* skip leading ^ */
			for (pos = 1; n->val.val.str[pos]; pos++)
			{
				if (n->val.val.str[pos] == '.' ||
					n->val.val.str[pos] == '?' ||
					n->val.val.str[pos] == '*' ||
					n->val.val.str[pos] == '[' ||
3472
					n->val.val.str[pos] == '$' ||
3473
					(strcmp(opname,"~*") == 0 && isalpha(n->val.val.str[pos])))
3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551
		     		break;
		     	if (n->val.val.str[pos] == '\\')
					pos++;
				match_least[match_pos] = n->val.val.str[pos];
				match_most[match_pos++] = n->val.val.str[pos];
			}

			if (match_pos != 0)
			{
				A_Const *least = makeNode(A_Const);
				A_Const *most = makeNode(A_Const);
				
				/* make strings to be used in index use */
				match_least[match_pos] = '\0';
				match_most[match_pos] = '\377';
				match_most[match_pos+1] = '\0';
				least->val.type = T_String;
				least->val.val.str = match_least;
				most->val.type = T_String;
				most->val.val.str = match_most;
				result = makeA_Expr(AND, NULL,
						makeA_Expr(OP, "~", lexpr, rexpr),
						makeA_Expr(AND, NULL,
							makeA_Expr(OP, ">=", lexpr, (Node *)least),
							makeA_Expr(OP, "<=", lexpr, (Node *)most)));
			}
		}
	}
	else if (strcmp(opname,"~~") == 0)
	{
		if (nodeTag(rexpr) == T_A_Const &&
		   ((A_Const *)rexpr)->val.type == T_String)
		{
			A_Const *n = (A_Const *)rexpr;
			char *match_least = palloc(strlen(n->val.val.str)+2);
			char *match_most = palloc(strlen(n->val.val.str)+2);
			int pos, match_pos=0;
	
			for (pos = 0; n->val.val.str[pos]; pos++)
			{
				if ((n->val.val.str[pos] == '%' &&
					 n->val.val.str[pos+1] != '%') ||
				    (n->val.val.str[pos] == '_' &&
		     		 n->val.val.str[pos+1] != '_'))
		     		break;
		     	if (n->val.val.str[pos] == '%' ||
				    n->val.val.str[pos] == '_' ||
				    n->val.val.str[pos] == '\\')
					pos++;
				match_least[match_pos] = n->val.val.str[pos];
				match_most[match_pos++] = n->val.val.str[pos];
			}
	
			if (match_pos != 0)
			{
				A_Const *least = makeNode(A_Const);
				A_Const *most = makeNode(A_Const);
				
				/* make strings to be used in index use */
				match_least[match_pos] = '\0';
				match_most[match_pos] = '\377';
				match_most[match_pos+1] = '\0';
				least->val.type = T_String;
				least->val.val.str = match_least;
				most->val.type = T_String;
				most->val.val.str = match_most;
				result = makeA_Expr(AND, NULL,
						makeA_Expr(OP, "~~", lexpr, rexpr),
						makeA_Expr(AND, NULL,
							makeA_Expr(OP, ">=", lexpr, (Node *)least),
							makeA_Expr(OP, "<=", lexpr, (Node *)most)));
			}
		}
	}
	
	if (result == NULL)
		result = makeA_Expr(OP, opname, lexpr, rexpr);
	return result;
3552
} /* makeIndexable() */
3553 3554


3555 3556
/* xlateSqlType()
 * Convert alternate type names to internal Postgres types.
3557 3558
 * Do not convert "float", since that is handled elsewhere
 *  for FLOAT(p) syntax.
3559
 */
3560 3561 3562
static char *
xlateSqlType(char *name)
{
3563 3564
	if (!strcasecmp(name,"int")
	 || !strcasecmp(name,"integer"))
3565
		return "int4";
3566 3567
	else if (!strcasecmp(name, "smallint"))
		return "int2";
3568
	else if (!strcasecmp(name, "real"))
3569 3570 3571
		return "float8";
	else if (!strcasecmp(name, "interval"))
		return "timespan";
3572 3573
	else if (!strcasecmp(name, "boolean"))
		return "bool";
3574 3575
	else
		return name;
3576
} /* xlateSqlName() */
3577

3578

3579 3580
void parser_init(Oid *typev, int nargs)
{
3581
	QueryIsRule = FALSE;
3582 3583
	saved_relname[0]= '\0';
	saved_In_Expr = NULL;
3584

3585
	param_type_init(typev, nargs);
3586
}
3587

3588

3589 3590 3591
/* FlattenStringList()
 * Traverse list of string nodes and convert to a single string.
 * Used for reconstructing string form of complex expressions.
3592 3593
 *
 * Allocate at least one byte for terminator.
3594 3595 3596 3597
 */
static char *
FlattenStringList(List *list)
{
3598 3599
	List *l;
	Value *v;
3600 3601
	char *s;
	char *sp;
3602
	int nlist, len = 0;
3603 3604 3605 3606

	nlist = length(list);
	l = list;
	while(l != NIL) {
3607 3608
		v = (Value *)lfirst(l);
		sp = v->val.str;
3609
		l = lnext(l);
3610
		len += strlen(sp);
3611
	};
3612
	len += nlist;
3613

3614
	s = (char*) palloc(len+1);
3615 3616 3617 3618
	*s = '\0';

	l = list;
	while(l != NIL) {
3619 3620
		v = (Value *)lfirst(l);
		sp = v->val.str;
3621 3622
		l = lnext(l);
		strcat(s,sp);
3623
		if (l != NIL) strcat(s," ");
3624
	};
3625
	*(s+len) = '\0';
3626 3627 3628 3629 3630 3631 3632 3633

#ifdef PARSEDEBUG
printf( "flattened string is \"%s\"\n", s);
#endif

	return(s);
} /* FlattenStringList() */

3634

3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659
/* makeConstantList()
 * Convert constant value node into string node.
 */
static List *
makeConstantList( A_Const *n)
{
	char *defval = NULL;
	if (nodeTag(n) != T_A_Const) {
		elog(WARN,"Cannot handle non-constant parameter",NULL);

	} else if (n->val.type == T_Float) {
		defval = (char*) palloc(20+1);
		sprintf( defval, "%g", n->val.val.dval);

	} else if (n->val.type == T_Integer) {
		defval = (char*) palloc(20+1);
		sprintf( defval, "%ld", n->val.val.ival);

	} else if (n->val.type == T_String) {
		defval = (char*) palloc(strlen( ((A_Const *) n)->val.val.str) + 3);
		strcpy( defval, "'");
		strcat( defval, ((A_Const *) n)->val.val.str);
		strcat( defval, "'");

	} else {
3660
		elog(WARN,"Internal error in makeConstantList(): cannot encode node",NULL);
3661 3662 3663 3664 3665 3666 3667 3668
	};

#ifdef PARSEDEBUG
printf( "AexprConst argument is \"%s\"\n", defval);
#endif

	return( lcons( makeString(defval), NIL));
} /* makeConstantList() */
3669

3670

3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696
/* fmtId()
 * Check input string for non-lowercase/non-numeric characters.
 * Returns either input string or input surrounded by double quotes.
 */
static char *
fmtId(char *rawid)
{
	static char *cp;

	for (cp = rawid; *cp != '\0'; cp++)
		if (! (islower(*cp) || isdigit(*cp) || (*cp == '_'))) break;

	if (*cp != '\0') {
		cp = palloc(strlen(rawid)+1);
		strcpy(cp,"\"");
		strcat(cp,rawid);
		strcat(cp,"\"");
	} else {
		cp = rawid;
	};

#ifdef PARSEDEBUG
printf("fmtId- %sconvert %s to %s\n", ((cp == rawid)? "do not ": ""), rawid, cp);
#endif

	return(cp);
3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717
}

/*
 * param_type_init()
 *
 * keep enough information around fill out the type of param nodes
 * used in postquel functions
 */
static void
param_type_init(Oid *typev, int nargs)
{
	pfunc_num_args = nargs;
	param_type_info = typev;
}

Oid param_type(int t)
{
	if ((t > pfunc_num_args) || (t == 0))
		return InvalidOid;
	return param_type_info[t - 1];
}