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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 2.45 1999/01/18 06:46:32 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 "parser/parse_type.h"
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#include "utils/acl.h"
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#include "utils/palloc.h"
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#include "catalog/catname.h"
#include "utils/elog.h"
#include "access/xact.h"
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#include "storage/lmgr.h"
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#include "utils/numeric.h"
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#include "parser/analyze.h"
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#ifdef MULTIBYTE
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#include "mb/pg_wchar.h"
#endif

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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 List *saved_In_Expr = NIL;
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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*/

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static char *xlateSqlFunc(char *);
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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 Node *makeRowExpr(char *opr, List *largs, List *rargs);
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static void mapTargetColumns(List *source, List *target);
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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;
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	bool*				pboolean;	/* for pg_shadow privileges */
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	List				*list;
	Node				*node;
	Value				*value;

	Attr				*attr;

	TypeName			*typnam;
	DefElem				*defelt;
	ParamString			*param;
	SortGroupBy			*sortgroupby;
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	JoinUsing			*joinusing;
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	IndexElem			*ielem;
	RangeVar			*range;
	RelExpr				*relexp;
	A_Indices			*aind;
	ResTarget			*target;
	ParamNo				*paramno;

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

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%type <node>	stmt,
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		AddAttrStmt, ClosePortalStmt,
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		CopyStmt, CreateStmt, CreateAsStmt, CreateSeqStmt, DefineStmt, DestroyStmt,
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		ExtendStmt, FetchStmt,	GrantStmt, CreateTrigStmt, DropTrigStmt,
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		CreatePLangStmt, DropPLangStmt,
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		IndexStmt, ListenStmt, UnlistenStmt, LockStmt, OptimizableStmt,
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		ProcedureStmt, 	RecipeStmt, RemoveAggrStmt, RemoveOperStmt,
		RemoveFuncStmt, RemoveStmt,
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		RenameStmt, RevokeStmt, RuleStmt, TransactionStmt, ViewStmt, LoadStmt,
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		CreatedbStmt, DestroydbStmt, VacuumStmt, CursorStmt, SubSelect,
		UpdateStmt, InsertStmt, select_w_o_sort, SelectStmt, NotifyStmt, DeleteStmt, 
		ClusterStmt, ExplainStmt, VariableSetStmt, VariableShowStmt, VariableResetStmt,
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		CreateUserStmt, AlterUserStmt, DropUserStmt
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%type <str>	opt_database1, opt_database2, location, encoding
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%type <str>	opt_lmode

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%type <pboolean> user_createdb_clause, user_createuser_clause
%type <str>   user_passwd_clause
%type <str>   user_valid_clause
%type <list>  user_group_list, user_group_clause

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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, func_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,
		OptInherit, definition,
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		opt_with, func_args, func_args_list,
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		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, TriggerFuncArgs
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%type <node>	func_return
%type <boolean>	set_opt

%type <boolean>	TriggerForOpt, TriggerForType

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%type <list>	for_update_clause
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%type <list>	join_list
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%type <joinusing>
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				join_using
%type <boolean>	opt_union
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%type <boolean>	opt_table
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%type <boolean>	opt_trans
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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 <boolean> cursor_clause, opt_cursor, opt_readonly, opt_of
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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 <node>	OptTableElement, ConstraintElem
%type <node>	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, b_expr, 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 <list>	row_descriptor, row_list, c_list, c_expr
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%type <node>	row_expr
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%type <str>		row_op
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%type <node>	case_expr, case_arg, when_clause, case_default
%type <list>	when_clause_list
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%type <ival>	sub_type
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%type <list>	OptCreateAs, CreateAsList
%type <node>	CreateAsElement
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%type <value>	NumericOnly, FloatOnly, IntegerOnly
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%type <attr>	event_object, attr
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%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
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%type <str>		generic, numeric, character, datetime
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%type <str>		extract_arg
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%type <str>		opt_charset, opt_collate
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%type <str>		opt_float
%type <ival>	opt_numeric, opt_decimal
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%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>		UserId, var_value, zone_value
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%type <str>		ColId, ColLabel
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%type <str>		TypeId
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%type <node>	TableConstraint
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%type <list>	constraint_list, constraint_expr
%type <list>	default_list, default_expr
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%type <list>	ColPrimaryKey, ColQualList, ColQualifier
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%type <node>	ColConstraint, ColConstraintElem
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%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	ABSOLUTE, ACTION, ADD, ALL, ALTER, AND, ANY, AS, ASC,
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		BEGIN_TRANS, BETWEEN, BOTH, BY,
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		CASCADE, CASE, CAST, CHAR, CHARACTER, CHECK, CLOSE,
		COALESCE, COLLATE, COLUMN, COMMIT, 
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		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,
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		ELSE, END_TRANS, EXCEPT, EXECUTE, EXISTS, EXTRACT,
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		FALSE_P, FETCH, FLOAT, FOR, FOREIGN, FROM, FULL,
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		GRANT, GROUP, HAVING, HOUR_P,
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		IN, INNER_P, INSENSITIVE, INSERT, INTERSECT, INTERVAL, INTO, IS,
		ISOLATION, JOIN, KEY, LANGUAGE, LEADING, LEFT, LEVEL, LIKE, LOCAL,
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		MATCH, MINUTE_P, MONTH_P, NAMES,
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		NATIONAL, NATURAL, NCHAR, NEXT, NO, NOT, NULLIF, NULL_P, NUMERIC,
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		OF, ON, ONLY, OPTION, OR, ORDER, OUTER_P,
		PARTIAL, POSITION, PRECISION, PRIMARY, PRIOR, PRIVILEGES, PROCEDURE, PUBLIC,
		READ, REFERENCES, RELATIVE, REVOKE, RIGHT, ROLLBACK,
		SCROLL, SECOND_P, SELECT, SET, SUBSTRING,
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		TABLE, THEN, TIME, TIMESTAMP, TIMEZONE_HOUR, TIMEZONE_MINUTE,
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		TO, TRAILING, TRANSACTION, TRIM, TRUE_P,
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		UNION, UNIQUE, UPDATE, USER, USING,
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		VALUES, VARCHAR, VARYING, VIEW,
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		WHEN, WHERE, WITH, WORK, YEAR_P, ZONE
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/* Keywords (in SQL3 reserved words) */
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%token	TRIGGER
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/* Keywords (in SQL92 non-reserved words) */
%token	TYPE_P

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/* Keywords for Postgres support (not in SQL92 reserved words)
 *
 * The CREATEDB and CREATEUSER tokens should go away
 * when some sort of pg_privileges relation is introduced.
 * - Todd A. Brandys 1998-01-01?
 */
%token	ABORT_TRANS, AFTER, AGGREGATE, ANALYZE, BACKWARD, BEFORE, BINARY, 
		CACHE, CLUSTER, COPY, CREATEDB, CREATEUSER, CYCLE,
		DATABASE, DELIMITERS, DO, EACH, ENCODING, EXPLAIN, EXTEND,
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		FORWARD, FUNCTION, HANDLER,
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		INCREMENT, INDEX, INHERITS, INSTEAD, ISNULL,
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		LANCOMPILER, LISTEN, LOAD, LOCATION, LOCK_P, MAXVALUE, MINVALUE, MOVE,
		NEW, NOCREATEDB, NOCREATEUSER, NONE, NOTHING, NOTIFY, NOTNULL,
		OIDS, OPERATOR, PASSWORD, PROCEDURAL,
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		RECIPE, RENAME, RESET, RETURNS, ROW, RULE,
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		SEQUENCE, SERIAL, SETOF, SHOW, START, STATEMENT, STDIN, STDOUT, TRUSTED, 
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		UNLISTEN, UNTIL, VACUUM, VALID, 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		'='
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%nonassoc	'<' '>'
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%nonassoc	LIKE
%nonassoc	BETWEEN
%nonassoc	IN
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%nonassoc	Op				/* multi-character ops and user-defined operators */
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%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 */
%right		UMINUS
%left		'.'
%left		'[' ']'
%nonassoc	TYPECAST
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%left		UNION INTERSECT EXCEPT
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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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				{ $$ = lappend($1, $2); }
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/***S*I***/
/* We comment the next rule because it seems to be redundant
 * and produces 16 shift/reduce conflicts with the new SelectStmt rule
 * needed for EXCEPT and INTERSECTS. So far I did not notice any
 * violations by removing the rule! */
/* 		| stmtmulti stmt
				{ $$ = 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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		| AlterUserStmt
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		| ClosePortalStmt
		| CopyStmt
		| CreateStmt
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		| CreateAsStmt
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		| CreateSeqStmt
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		| CreatePLangStmt
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		| CreateTrigStmt
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		| CreateUserStmt
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		| ClusterStmt
		| DefineStmt
		| DestroyStmt
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		| DropPLangStmt
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		| DropTrigStmt
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		| DropUserStmt
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		| ExtendStmt
		| ExplainStmt
		| FetchStmt
		| GrantStmt
		| IndexStmt
		| ListenStmt
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		| UnlistenStmt
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		| LockStmt
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		| 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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 * Create a new Postgres DBMS user
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 *
 *
 *****************************************************************************/

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CreateUserStmt:  CREATE USER UserId user_passwd_clause user_createdb_clause
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			user_createuser_clause user_group_clause user_valid_clause
				{
					CreateUserStmt *n = makeNode(CreateUserStmt);
					n->user = $3;
					n->password = $4;
					n->createdb = $5;
					n->createuser = $6;
					n->groupElts = $7;
					n->validUntil = $8;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
 * Alter a postresql DBMS user
 *
 *
 *****************************************************************************/

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AlterUserStmt:  ALTER USER UserId user_passwd_clause user_createdb_clause
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			user_createuser_clause user_group_clause user_valid_clause
				{
					AlterUserStmt *n = makeNode(AlterUserStmt);
					n->user = $3;
					n->password = $4;
					n->createdb = $5;
					n->createuser = $6;
					n->groupElts = $7;
					n->validUntil = $8;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
 * Drop a postresql DBMS user
 *
 *
 *****************************************************************************/

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DropUserStmt:  DROP USER UserId
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				{
					DropUserStmt *n = makeNode(DropUserStmt);
					n->user = $3;
					$$ = (Node *)n;
				}
		;

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user_passwd_clause:  WITH PASSWORD UserId		{ $$ = $3; }
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			| /*EMPTY*/							{ $$ = NULL; }
		;

user_createdb_clause:  CREATEDB
				{
					bool*  b;
					$$ = (b = (bool*)palloc(sizeof(bool)));
					*b = true;
				}
			| NOCREATEDB
				{
					bool*  b;
					$$ = (b = (bool*)palloc(sizeof(bool)));
					*b = false;
				}
			| /*EMPTY*/							{ $$ = NULL; }
		;

user_createuser_clause:  CREATEUSER
				{
					bool*  b;
					$$ = (b = (bool*)palloc(sizeof(bool)));
					*b = true;
				}
			| NOCREATEUSER
				{
					bool*  b;
					$$ = (b = (bool*)palloc(sizeof(bool)));
					*b = false;
				}
			| /*EMPTY*/							{ $$ = NULL; }
		;

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user_group_list:  user_group_list ',' UserId
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				{
					$$ = lcons((void*)makeString($3), $1);
				}
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			| UserId
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				{
					$$ = lcons((void*)makeString($1), NIL);
				}
		;

user_group_clause:  IN GROUP user_group_list	{ $$ = $3; }
			| /*EMPTY*/							{ $$ = NULL; }
		;

user_valid_clause:  VALID UNTIL SCONST			{ $$ = $3; }
			| /*EMPTY*/							{ $$ = NULL; }
		;
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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;
					$$ = (Node *) n;
				}
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		| SET TRANSACTION ISOLATION LEVEL READ ColId
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name  = "XactIsoLevel";
					n->value = $6;
					if (strcasecmp(n->value, "COMMITTED"))
						elog(ERROR,"parser: syntax error at or near \"%s\"", n->value);
					$$ = (Node *) n;
				}
		| SET TRANSACTION ISOLATION LEVEL ColId
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name  = "XactIsoLevel";
					n->value = $5;
					if (strcasecmp(n->value, "SERIALIZABLE"))
						elog(ERROR,"parser: syntax error at or near \"%s\"", n->value);
					$$ = (Node *) n;
				}
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		| SET NAMES encoding
				{
#ifdef MB
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name  = "client_encoding";
					n->value = $3;
					$$ = (Node *) n;
#else
					elog(ERROR, "SET NAMES is not supported");
#endif
				}
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		;

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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				{ $$ = NULL; }
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		;
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VariableShowStmt:  SHOW ColId
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				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name  = $2;
					$$ = (Node *) n;
				}
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		| SHOW TIME ZONE
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name  = "timezone";
					$$ = (Node *) n;
				}
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		| SHOW TRANSACTION ISOLATION LEVEL
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name  = "XactIsoLevel";
					$$ = (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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		| RESET TRANSACTION ISOLATION LEVEL
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name  = "XactIsoLevel";
					$$ = (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 '(' OptTableElementList ')'
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				{
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					Node *lp = lfirst($3);
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					if (length($3) != 1)
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						elog(ERROR,"ALTER TABLE/ADD() allows one column only");
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					$$ = lp;
				}
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			| DROP opt_column ColId
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				{	elog(ERROR,"ALTER TABLE/DROP COLUMN not yet implemented"); }
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			| ALTER opt_column ColId SET DEFAULT default_expr
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				{	elog(ERROR,"ALTER TABLE/ALTER COLUMN/SET DEFAULT not yet implemented"); }
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			| ALTER opt_column ColId DROP DEFAULT
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				{	elog(ERROR,"ALTER TABLE/ALTER COLUMN/DROP DEFAULT not yet implemented"); }
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			| ADD ConstraintElem
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				{	elog(ERROR,"ALTER TABLE/ADD CONSTRAINT not yet implemented"); }
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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; }
		| /*EMPTY*/								{ $$ = "\t"; }
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		;
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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
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				{
					CreateStmt *n = makeNode(CreateStmt);
					n->relname = $3;
					n->tableElts = $5;
					n->inhRelnames = $7;
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					n->constraints = NIL;
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					$$ = (Node *)n;
				}
		;

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OptTableElementList:  OptTableElementList ',' OptTableElement
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				{
					if ($3 != NULL)
						$$ = lappend($1, $3);
					else
						$$ = $1;
				}
			| OptTableElement
				{
					if ($1 != NULL)
						$$ = lcons($1, NIL);
					else
						$$ = NULL;
				}
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			| /*EMPTY*/							{ $$ = NULL; }
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		;
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OptTableElement:  columnDef						{ $$ = $1; }
			| TableConstraint					{ $$ = $1; }
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		;
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columnDef:  ColId Typename ColQualifier
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				{
					ColumnDef *n = makeNode(ColumnDef);
					n->colname = $1;
					n->typename = $2;
					n->defval = NULL;
					n->is_not_null = FALSE;
					n->constraints = $3;
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					$$ = (Node *)n;
				}
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			| ColId SERIAL ColPrimaryKey
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				{
					ColumnDef *n = makeNode(ColumnDef);
					n->colname = $1;
					n->typename = makeNode(TypeName);
					n->typename->name = xlateSqlType("integer");
					n->defval = NULL;
					n->is_not_null = TRUE;
					n->is_sequence = TRUE;
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					n->constraints = $3;
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					$$ = (Node *)n;
				}
		;

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ColQualifier:  ColQualList						{ $$ = $1; }
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			| /*EMPTY*/							{ $$ = NULL; }
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		;
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ColQualList:  ColQualList ColConstraint
				{
					if ($2 != NULL)
						$$ = lappend($1, $2);
					else
						$$ = $1;
				}
			| ColConstraint
				{
					if ($1 != NULL)
						$$ = lcons($1, NIL);
					else
						$$ = NULL;
				}
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		;

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ColPrimaryKey:  PRIMARY KEY
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_PRIMARY;
					n->name = NULL;
					n->def = NULL;
					n->keys = NULL;
					$$ = lcons((Node *)n, NIL);
				}
			| /*EMPTY*/							{ $$ = NULL; }
		;

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ColConstraint:
		CONSTRAINT name ColConstraintElem
				{
						Constraint *n = (Constraint *)$3;
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						if (n != NULL) n->name = fmtId($2);
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						$$ = $3;
				}
		| ColConstraintElem
				{ $$ = $1; }
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		;
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/* The column constraint WITH NULL gives a shift/reduce error
 * because it requires yacc to look more than one token ahead to
 * resolve WITH TIME ZONE and WITH NULL.
 * So, leave it out of the syntax for now.
			| WITH NULL_P
				{
					$$ = NULL;
				}
 * - thomas 1998-09-12
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 *
 * DEFAULT NULL is already the default for Postgres.
 * Bue define it here and carry it forward into the system
 * to make it explicit.
 * - thomas 1998-09-13
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 */
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ColConstraintElem:  CHECK '(' constraint_expr ')'
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_CHECK;
					n->name = NULL;
					n->def = FlattenStringList($3);
					n->keys = NULL;
					$$ = (Node *)n;
				}
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			| DEFAULT NULL_P
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_DEFAULT;
					n->name = NULL;
					n->def = NULL;
					n->keys = NULL;
					$$ = (Node *)n;
				}
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			| DEFAULT default_expr
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_DEFAULT;
					n->name = NULL;
					n->def = FlattenStringList($2);
					n->keys = NULL;
					$$ = (Node *)n;
				}
			| NOT NULL_P
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_NOTNULL;
					n->name = NULL;
					n->def = NULL;
					n->keys = NULL;
					$$ = (Node *)n;
				}
			| UNIQUE
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_UNIQUE;
					n->name = NULL;
					n->def = NULL;
					n->keys = NULL;
					$$ = (Node *)n;
				}
			| PRIMARY KEY
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_PRIMARY;
					n->name = NULL;
					n->def = NULL;
					n->keys = NULL;
					$$ = (Node *)n;
				}
			| REFERENCES ColId opt_column_list key_match key_actions
				{
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					elog(NOTICE,"CREATE TABLE/FOREIGN KEY clause ignored; not yet implemented");
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					$$ = NULL;
				}
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		;
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default_list:  default_list ',' default_expr
				{
					$$ = lappend($1,makeString(","));
					$$ = nconc($$, $3);
				}
			| default_expr
				{
					$$ = $1;
				}
		;

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/* The Postgres default column value is NULL.
 * Rather than carrying DEFAULT NULL forward as a clause,
 * let's just have it be a no-op.
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			| NULL_P
				{	$$ = lcons( makeString("NULL"), NIL); }
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 * - thomas 1998-09-13
 */
default_expr:  AexprConst
				{	$$ = makeConstantList((A_Const *) $1); }
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			| '-' default_expr %prec UMINUS
				{	$$ = lcons( makeString( "-"), $2); }
			| default_expr '+' default_expr
				{	$$ = nconc( $1, lcons( makeString( "+"), $3)); }
			| default_expr '-' default_expr
				{	$$ = nconc( $1, lcons( makeString( "-"), $3)); }
			| default_expr '/' default_expr
				{	$$ = nconc( $1, lcons( makeString( "/"), $3)); }
			| default_expr '*' default_expr
				{	$$ = nconc( $1, lcons( makeString( "*"), $3)); }
			| default_expr '=' default_expr
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				{	elog(ERROR,"boolean expressions not supported in DEFAULT"); }
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			| default_expr '<' default_expr
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				{	elog(ERROR,"boolean expressions not supported in DEFAULT"); }
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			| default_expr '>' default_expr
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				{	elog(ERROR,"boolean expressions not supported in DEFAULT"); }
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			| ':' default_expr
				{	$$ = lcons( makeString( ":"), $2); }
			| ';' default_expr
				{	$$ = lcons( makeString( ";"), $2); }
			| '|' default_expr
				{	$$ = lcons( makeString( "|"), $2); }
			| default_expr TYPECAST Typename
				{
					$3->name = fmtId($3->name);
					$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
				}
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			| CAST '(' default_expr AS Typename ')'
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				{
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					$5->name = fmtId($5->name);
					$$ = nconc( lcons( makeString( "CAST"), $3), makeList( makeString("AS"), $5, -1));
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				}
			| '(' default_expr ')'
				{	$$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
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			| func_name '(' ')'
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				{
					$$ = makeList( makeString($1), makeString("("), -1);
					$$ = lappend( $$, makeString(")"));
				}
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			| func_name '(' default_list ')'
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				{
					$$ = makeList( makeString($1), makeString("("), -1);
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					$$ = nconc( $$, $3);
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					$$ = lappend( $$, makeString(")"));
				}
			| default_expr Op default_expr
				{
					if (!strcmp("<=", $2) || !strcmp(">=", $2))
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						elog(ERROR,"boolean expressions not supported in DEFAULT");
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					$$ = nconc( $1, lcons( makeString( $2), $3));
				}
			| Op default_expr
				{	$$ = lcons( makeString( $1), $2); }
			| default_expr Op
				{	$$ = lappend( $1, makeString( $2)); }
			/* 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(%d) precision not implemented; zero used instead",$3);
					$$ = lcons( makeString( "'now'::time"), NIL);
				}
			| CURRENT_TIMESTAMP
				{	$$ = lcons( makeString( "now()"), NIL); }
			| CURRENT_TIMESTAMP '(' Iconst ')'
				{
					if ($3 != 0)
						elog(NOTICE,"CURRENT_TIMESTAMP(%d) precision not implemented; zero used instead",$3);
					$$ = lcons( makeString( "now()"), NIL);
				}
			| CURRENT_USER
				{	$$ = lcons( makeString( "CURRENT_USER"), NIL); }
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			| USER
				{	$$ = lcons( makeString( "USER"), NIL); }
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		;

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/* ConstraintElem specifies constraint syntax which is not embedded into
 *  a column definition. ColConstraintElem specifies the embedded form.
 * - thomas 1997-12-03
 */
TableConstraint:  CONSTRAINT name ConstraintElem
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				{
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						Constraint *n = (Constraint *)$3;
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						if (n != NULL) n->name = fmtId($2);
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						$$ = $3;
				}
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		| ConstraintElem
				{ $$ = $1; }
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		;

1041
ConstraintElem:  CHECK '(' constraint_expr ')'
1042
				{
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					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_CHECK;
					n->name = NULL;
					n->def = FlattenStringList($3);
					$$ = (Node *)n;
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				}
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		| UNIQUE '(' columnList ')'
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				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_UNIQUE;
					n->name = NULL;
					n->def = NULL;
					n->keys = $3;
					$$ = (Node *)n;
				}
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		| PRIMARY KEY '(' columnList ')'
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				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_PRIMARY;
					n->name = NULL;
					n->def = NULL;
					n->keys = $4;
					$$ = (Node *)n;
				}
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		| FOREIGN KEY '(' columnList ')' REFERENCES ColId opt_column_list key_match key_actions
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				{
					elog(NOTICE,"CREATE TABLE/FOREIGN KEY clause ignored; not yet implemented");
					$$ = NULL;
				}
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		;
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constraint_list:  constraint_list ',' constraint_expr
				{
					$$ = lappend($1,makeString(","));
					$$ = nconc($$, $3);
				}
			| constraint_expr
				{
					$$ = $1;
				}
		;

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constraint_expr:  AexprConst
1086
				{	$$ = makeConstantList((A_Const *) $1); }
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			| NULL_P
1088
				{	$$ = lcons( makeString("NULL"), NIL); }
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			| ColId
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				{
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					$$ = lcons( makeString(fmtId($1)), NIL);
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				}
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			| '-' constraint_expr %prec UMINUS
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				{	$$ = lcons( makeString( "-"), $2); }
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			| constraint_expr '+' constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( "+"), $3)); }
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			| constraint_expr '-' constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( "-"), $3)); }
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			| constraint_expr '/' constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( "/"), $3)); }
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			| constraint_expr '*' constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( "*"), $3)); }
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			| constraint_expr '=' constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( "="), $3)); }
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			| constraint_expr '<' constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( "<"), $3)); }
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			| constraint_expr '>' constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( ">"), $3)); }
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			| ':' constraint_expr
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				{	$$ = lcons( makeString( ":"), $2); }
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			| ';' constraint_expr
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				{	$$ = lcons( makeString( ";"), $2); }
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			| '|' constraint_expr
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				{	$$ = lcons( makeString( "|"), $2); }
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			| constraint_expr TYPECAST Typename
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				{
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					$3->name = fmtId($3->name);
					$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
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				}
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			| CAST '(' constraint_expr AS Typename ')'
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				{
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					$5->name = fmtId($5->name);
					$$ = nconc( lcons( makeString( "CAST"), $3), makeList( makeString("AS"), $5, -1));
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				}
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			| '(' constraint_expr ')'
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				{	$$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
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			| func_name '(' ')'
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				{
					$$ = makeList( makeString($1), makeString("("), -1);
					$$ = lappend( $$, makeString(")"));
				}
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			| func_name '(' constraint_list ')'
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				{
					$$ = makeList( makeString($1), makeString("("), -1);
					$$ = nconc( $$, $3);
					$$ = lappend( $$, makeString(")"));
				}
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			| constraint_expr Op constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( $2), $3)); }
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			| constraint_expr LIKE constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( "LIKE"), $3)); }
			| constraint_expr NOT LIKE constraint_expr
				{	$$ = nconc( $1, lcons( makeString( "NOT LIKE"), $4)); }
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			| constraint_expr AND constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( "AND"), $3)); }
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			| constraint_expr OR constraint_expr
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				{	$$ = nconc( $1, lcons( makeString( "OR"), $3)); }
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			| NOT constraint_expr
				{	$$ = lcons( makeString( "NOT"), $2); }
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			| Op constraint_expr
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				{	$$ = lcons( makeString( $1), $2); }
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			| constraint_expr Op
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				{	$$ = lappend( $1, makeString( $2)); }
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			| constraint_expr ISNULL
				{	$$ = lappend( $1, makeString( "IS NULL")); }
			| constraint_expr IS NULL_P
				{	$$ = lappend( $1, makeString( "IS NULL")); }
			| constraint_expr NOTNULL
				{	$$ = lappend( $1, makeString( "IS NOT NULL")); }
			| constraint_expr IS NOT NULL_P
				{	$$ = lappend( $1, makeString( "IS NOT NULL")); }
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			| constraint_expr IS TRUE_P
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				{	$$ = lappend( $1, makeString( "IS TRUE")); }
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			| constraint_expr IS FALSE_P
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				{	$$ = lappend( $1, makeString( "IS FALSE")); }
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			| constraint_expr IS NOT TRUE_P
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				{	$$ = lappend( $1, makeString( "IS NOT TRUE")); }
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			| constraint_expr IS NOT FALSE_P
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				{	$$ = lappend( $1, makeString( "IS NOT FALSE")); }
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			| constraint_expr IN '(' c_list ')'
				{
					$$ = lappend( $1, makeString("IN"));
					$$ = lappend( $$, makeString("("));
					$$ = nconc( $$, $4);
					$$ = lappend( $$, makeString(")"));
				}
			| constraint_expr NOT IN '(' c_list ')'
				{
					$$ = lappend( $1, makeString("NOT IN"));
					$$ = lappend( $$, makeString("("));
					$$ = nconc( $$, $5);
					$$ = lappend( $$, makeString(")"));
				}
			| constraint_expr BETWEEN c_expr AND c_expr
				{
					$$ = lappend( $1, makeString("BETWEEN"));
					$$ = nconc( $$, $3);
					$$ = lappend( $$, makeString("AND"));
					$$ = nconc( $$, $5);
				}
			| constraint_expr NOT BETWEEN c_expr AND c_expr
				{
					$$ = lappend( $1, makeString("NOT BETWEEN"));
					$$ = nconc( $$, $4);
					$$ = lappend( $$, makeString("AND"));
					$$ = nconc( $$, $6);
				}
		;

c_list:  c_list ',' c_expr
				{
					$$ = lappend($1, makeString(","));
					$$ = nconc($$, $3);
				}
			| c_expr
				{
					$$ = $1;
				}
		;

c_expr:  AexprConst
				{	$$ = makeConstantList((A_Const *) $1); }
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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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OptInherit:  INHERITS '(' relation_name_list ')'		{ $$ = $3; }
		| /*EMPTY*/										{ $$ = NIL; }
		;

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CreateAsStmt:  CREATE TABLE relation_name OptCreateAs AS SubSelect
				{
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					SelectStmt *n = (SelectStmt *)$6;
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					if ($4 != NIL)
						mapTargetColumns($4, n->targetList);
					n->into = $3;
					$$ = (Node *)n;
				}
		;

OptCreateAs:  '(' CreateAsList ')'				{ $$ = $2; }
			| /*EMPTY*/							{ $$ = NULL; }
		;

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

CreateAsElement:  ColId
				{
					ColumnDef *n = makeNode(ColumnDef);
					n->colname = $1;
					n->typename = NULL;
					n->defval = NULL;
					n->is_not_null = FALSE;
					n->constraints = NULL;
					$$ = (Node *)n;
				}
		;

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

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OptSeqElem:  CACHE IntegerOnly
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				{
					$$ = makeNode(DefElem);
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					$$->defname = "cache";
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					$$->arg = (Node *)$2;
				}
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			| CYCLE
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				{
					$$ = makeNode(DefElem);
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					$$->defname = "cycle";
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					$$->arg = (Node *)NULL;
				}
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			| INCREMENT IntegerOnly
				{
					$$ = makeNode(DefElem);
					$$->defname = "increment";
					$$->arg = (Node *)$2;
				}
			| MAXVALUE IntegerOnly
				{
					$$ = makeNode(DefElem);
					$$->defname = "maxvalue";
					$$->arg = (Node *)$2;
				}
			| MINVALUE IntegerOnly
				{
					$$ = makeNode(DefElem);
					$$->defname = "minvalue";
					$$->arg = (Node *)$2;
				}
			| START IntegerOnly
				{
					$$ = makeNode(DefElem);
					$$->defname = "start";
					$$->arg = (Node *)$2;
				}
		;

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

FloatOnly:  FCONST
				{
					$$ = makeFloat($1);
				}
			| '-' FCONST
				{
					$$ = makeFloat($2);
					$$->val.dval = - $$->val.dval;
				}
		;

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IntegerOnly:  Iconst
				{
					$$ = makeInteger($1);
				}
			| '-' Iconst
				{
					$$ = makeInteger($2);
					$$->val.ival = - $$->val.ival;
				}
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		;
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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
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				{
					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;
				}
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		;

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

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TriggerForSpec:  FOR TriggerForOpt TriggerForType
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				{
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					$$ = $3;
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				}
		;
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TriggerForOpt:  EACH						{ $$ = TRUE; }
			| /*EMPTY*/						{ $$ = FALSE; }
		;

TriggerForType:  ROW						{ $$ = TRUE; }
			| STATEMENT						{ $$ = FALSE; }
		;

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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*/
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				{ $$ = NIL; }
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		;

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TriggerFuncArg:  ICONST
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				{
					char *s = (char *) palloc (256);
					sprintf (s, "%d", $1);
					$$ = s;
				}
			| FCONST
				{
					char *s = (char *) palloc (256);
					sprintf (s, "%g", $1);
					$$ = s;
				}
			| Sconst						{  $$ = $1; }
			| IDENT							{  $$ = $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							{ $$ = OPERATOR; }
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		| TYPE_P							{ $$ = 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); }
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		| NumericOnly					{  $$ = (Node *)$1; }
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		| Sconst						{  $$ = (Node *)makeString($1); }
		| SETOF ColId
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				{
					TypeName *n = makeNode(TypeName);
					n->name = $2;
					n->setof = TRUE;
					n->arrayBounds = NULL;
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					n->typmod = -1;
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					$$ = (Node *)n;
				}
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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] [ # | all ] [ in <portalname> ]
 *			fetch [ forward | backward | absolute | relative ]
 *			      [ # | all | next | prior ] [ [ in | from ] <portalname> ]
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 *
 *****************************************************************************/

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FetchStmt:	FETCH opt_direction fetch_how_many opt_portal_name
				{
					FetchStmt *n = makeNode(FetchStmt);
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					if ($2 == RELATIVE)
					{
						if ($3 == 0)
							elog(ERROR,"FETCH/RELATIVE at current position is not supported");
						$2 = FORWARD;
					}
					if ($3 < 0)
					{
						$3 = -$3;
						$2 = (($2 == FORWARD)? BACKWARD: FORWARD);
					}
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					n->direction = $2;
					n->howMany = $3;
					n->portalname = $4;
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					n->ismove = false;
					$$ = (Node *)n;
				}
		|	MOVE opt_direction fetch_how_many opt_portal_name
				{
					FetchStmt *n = makeNode(FetchStmt);
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					if ($3 < 0)
					{
						$3 = -$3;
						$2 = (($2 == FORWARD)? BACKWARD: FORWARD);
					}
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					n->direction = $2;
					n->howMany = $3;
					n->portalname = $4;
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					n->ismove = TRUE;
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					$$ = (Node *)n;
				}
		;

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opt_direction:	FORWARD					{ $$ = FORWARD; }
		| BACKWARD						{ $$ = BACKWARD; }
		| RELATIVE						{ $$ = RELATIVE; }
		| ABSOLUTE
			{
				elog(NOTICE,"FETCH/ABSOLUTE not supported, using RELATIVE");
				$$ = RELATIVE;
			}
		| /*EMPTY*/						{ $$ = FORWARD; /* default */ }
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		;
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fetch_how_many:  Iconst					{ $$ = $1; }
		| '-' Iconst					{ $$ = - $2; }
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		| ALL							{ $$ = 0; /* 0 means fetch all tuples*/ }
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		| NEXT							{ $$ = 1; }
		| PRIOR							{ $$ = -1; }
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		| /*EMPTY*/						{ $$ = 1; /*default*/ }
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		;
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opt_portal_name:  IN name				{ $$ = $2; }
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		| FROM 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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				{
					$$ = (Node*)makeAclStmt($2,$4,$6,'+');
				}
		;
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privileges:  ALL PRIVILEGES
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				{
				 $$ = 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);
				}
		;

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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,'-');
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
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 *				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:  func_name '(' name_list ')' opt_type opt_class
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				{
					$$ = makeNode(IndexElem);
					$$->name = $1;
					$$->args = $3;
					$$->class = $6;
1799
					$$->typename = $5;
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				}
		  ;

index_elem:  attr_name opt_type opt_class
				{
					$$ = makeNode(IndexElem);
					$$->name = $1;
					$$->args = NIL;
					$$->class = $3;
1809
					$$->typename = $2;
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				}
		;

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

/* 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
1822
 *		| WITH class							{ $$ = $2; }
1823 1824
 */
opt_class:  class								{ $$ = $1; }
1825
		| USING class							{ $$ = $2; }
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		| /*EMPTY*/								{ $$ = NULL; }
		;


1830 1831
/*****************************************************************************
 *
1832 1833
 *		QUERY:
 *				extend index <indexname> [where <qual>]
1834 1835 1836 1837
 *
 *****************************************************************************/

ExtendStmt:  EXTEND INDEX index_name where_clause
1838 1839 1840 1841 1842 1843 1844
				{
					ExtendStmt *n = makeNode(ExtendStmt);
					n->idxname = $3;
					n->whereClause = $4;
					$$ = (Node *)n;
				}
		;
1845

1846

1847 1848
/*****************************************************************************
 *
1849 1850
 *		QUERY:
 *				execute recipe <recipeName>
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 *
 *****************************************************************************/

1854
RecipeStmt:  EXECUTE RECIPE recipe_name
1855 1856 1857
				{
					RecipeStmt *n;
					if (!IsTransactionBlock())
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						elog(ERROR,"EXECUTE RECIPE may only be used in begin/end transaction blocks");
1859 1860 1861 1862 1863 1864

					n = makeNode(RecipeStmt);
					n->recipeName = $3;
					$$ = (Node *)n;
				}
		;
1865 1866 1867 1868


/*****************************************************************************
 *
1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
 *		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>
1880 1881 1882
 *
 *****************************************************************************/

1883 1884
ProcedureStmt:	CREATE FUNCTION func_name func_args
			 RETURNS func_return opt_with AS Sconst LANGUAGE Sconst
1885 1886 1887 1888
				{
					ProcedureStmt *n = makeNode(ProcedureStmt);
					n->funcname = $3;
					n->defArgs = $4;
1889
					n->returnType = $6;
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					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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		;

1900
func_args:  '(' func_args_list ')'				{ $$ = $2; }
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		| '(' ')'								{ $$ = NIL; }
1902
		;
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1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
func_args_list:  TypeId
				{	$$ = lcons(makeString($1),NIL); }
		| func_args_list ',' TypeId
				{	$$ = lappend($1,makeString($3)); }
		;

func_return:  set_opt TypeId
				{
					TypeName *n = makeNode(TypeName);
					n->name = $2;
					n->setof = $1;
					n->arrayBounds = NULL;
					$$ = (Node *)n;
				}
		;

set_opt:  SETOF									{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
		;
1923 1924 1925

/*****************************************************************************
 *
1926
 *		QUERY:
1927
 *
1928 1929 1930 1931 1932 1933 1934 1935 1936 1937
 *		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")
1938 1939 1940 1941
 *
 *****************************************************************************/

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

1950
remove_type:  TYPE_P							{  $$ = TYPE_P; }
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		| INDEX									{  $$ = INDEX; }
		| RULE									{  $$ = RULE; }
		| VIEW									{  $$ = VIEW; }
1954
		;
1955

1956

1957
RemoveAggrStmt:  DROP AGGREGATE name aggr_argtype
1958 1959 1960 1961 1962 1963 1964 1965 1966
				{
						RemoveAggrStmt *n = makeNode(RemoveAggrStmt);
						n->aggname = $3;
						n->aggtype = $4;
						$$ = (Node *)n;
				}
		;

aggr_argtype:  name								{ $$ = $1; }
1967
		| '*'									{ $$ = NULL; }
1968
		;
1969

1970 1971

RemoveFuncStmt:  DROP FUNCTION func_name func_args
1972 1973 1974
				{
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->funcname = $3;
1975
					n->args = $4;
1976 1977 1978 1979
					$$ = (Node *)n;
				}
		;

1980 1981

RemoveOperStmt:  DROP OPERATOR all_Op '(' oper_argtypes ')'
1982 1983 1984 1985 1986 1987 1988
				{
					RemoveOperStmt *n = makeNode(RemoveOperStmt);
					n->opname = $3;
					n->args = $5;
					$$ = (Node *)n;
				}
		;
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1990
all_Op:  Op | MathOp;
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1992
MathOp:	'+'				{ $$ = "+"; }
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		| '-'			{ $$ = "-"; }
		| '*'			{ $$ = "*"; }
		| '/'			{ $$ = "/"; }
		| '<'			{ $$ = "<"; }
		| '>'			{ $$ = ">"; }
		| '='			{ $$ = "="; }
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		;

oper_argtypes:	name
				{
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				   elog(ERROR,"parser: argument type missing (use NONE for unary operators)");
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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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2013

2014 2015
/*****************************************************************************
 *
2016 2017 2018
 *		QUERY:
 *				rename <attrname1> in <relname> [*] to <attrname2>
 *				rename <relname1> to <relname2>
2019
 *
2020 2021
 *****************************************************************************/

2022
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							{ $$ = $1; }
2035
		| /*EMPTY*/						{ $$ = NULL; }
2036 2037 2038 2039 2040
		;

opt_column:  COLUMN						{ $$ = COLUMN; }
		| /*EMPTY*/						{ $$ = 0; }
		;
2041 2042 2043


/*****************************************************************************
2044
 *
2045 2046
 *		QUERY:	Define Rewrite Rule , Define Tuple Rule
 *				Define Rule <old rules >
2047
 *
2048
 *		only rewrite rule is supported -- ay 9/94
2049
 *
2050 2051
 *****************************************************************************/

2052
RuleStmt:  CREATE RULE name AS
2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
		   { 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 ']'			{ $$ = $2; }
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/***S*I*D***/
/* We comment this out because it produces a shift / reduce conflict 
 * with the select_w_o_sort rule */
/*		| '(' OptStmtBlock ')'			{ $$ = $2; } */
2075
		;
2076

2077
OptStmtBlock:  OptStmtMulti
2078
				{  $$ = $1; }
2079
		| OptimizableStmt
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				{ $$ = lcons($1, NIL); }
		;
2082

2083
OptStmtMulti:  OptStmtMulti OptimizableStmt ';'
2084
				{  $$ = lappend($1, $2); }
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/***S*I***/
/* We comment the next rule because it seems to be redundant
 * and produces 16 shift/reduce conflicts with the new SelectStmt rule
 * needed for EXCEPT and INTERSECT. So far I did not notice any
 * violations by removing the rule! */
/* 		| OptStmtMulti OptimizableStmt
				{  $$ = lappend($1, $2); } */
2092
		| OptimizableStmt ';'
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				{ $$ = lcons($1, NIL); }
		;
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2096
event_object:  relation_name '.' attr_name
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				{
					$$ = 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						{ $$ = CMD_INSERT; }
		 ;
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2121
opt_instead:  INSTEAD					{ $$ = TRUE; }
2122
		| /*EMPTY*/						{ $$ = FALSE; }
2123
		;
2124 2125 2126 2127


/*****************************************************************************
 *
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 *		QUERY:
 *				NOTIFY <relation_name>	can appear both in rule bodies and
 *				as a query-level command
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 *
 *****************************************************************************/

2134
NotifyStmt:  NOTIFY relation_name
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				{
					NotifyStmt *n = makeNode(NotifyStmt);
					n->relname = $2;
					$$ = (Node *)n;
				}
		;
2141

2142
ListenStmt:  LISTEN relation_name
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				{
					ListenStmt *n = makeNode(ListenStmt);
					n->relname = $2;
					$$ = (Node *)n;
				}
2148 2149
;

2150 2151 2152 2153 2154 2155
UnlistenStmt:  UNLISTEN relation_name
				{
					UnlistenStmt *n = makeNode(UnlistenStmt);
					n->relname = $2;
					$$ = (Node *)n;
				}
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		| UNLISTEN '*'
				{
					UnlistenStmt *n = makeNode(UnlistenStmt);
					n->relname = "*";
					$$ = (Node *)n;
				}
2162 2163
;

2164 2165 2166

/*****************************************************************************
 *
2167
 *		Transactions:
2168
 *
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 *		abort transaction
 *				(ABORT)
 *		begin transaction
 *				(BEGIN)
 *		end transaction
 *				(END)
2175
 *
2176 2177
 *****************************************************************************/

2178
TransactionStmt: ABORT_TRANS opt_trans
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				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = ABORT_TRANS;
					$$ = (Node *)n;
				}
2184
		| BEGIN_TRANS opt_trans
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				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = BEGIN_TRANS;
					$$ = (Node *)n;
				}
2190
		| COMMIT opt_trans
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				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = END_TRANS;
					$$ = (Node *)n;
				}
2196
		| END_TRANS opt_trans
2197 2198 2199 2200 2201
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = END_TRANS;
					$$ = (Node *)n;
				}
2202
		| ROLLBACK opt_trans
2203 2204 2205 2206 2207
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->command = ABORT_TRANS;
					$$ = (Node *)n;
				}
2208
		;
2209

2210 2211 2212
opt_trans: WORK									{ $$ = TRUE; }
		| TRANSACTION							{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = TRUE; }
2213
		;
2214 2215 2216 2217


/*****************************************************************************
 *
2218 2219
 *		QUERY:
 *				define view <viewname> '('target-list ')' [where <quals> ]
2220 2221 2222
 *
 *****************************************************************************/

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ViewStmt:  CREATE VIEW name AS SelectStmt
2224 2225 2226 2227
				{
					ViewStmt *n = makeNode(ViewStmt);
					n->viewname = $3;
					n->query = (Query *)$5;
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					if (((SelectStmt *)n->query)->sortClause != NULL)
						elog(ERROR,"Order by and Distinct on views is not implemented.");
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					if (((SelectStmt *)n->query)->unionClause != NULL)
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						elog(ERROR,"Views on unions not implemented.");
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					if (((SelectStmt *)n->query)->forUpdate != NULL)
						elog(ERROR, "SELECT FOR UPDATE is not allowed in CREATE VIEW");
2234 2235 2236
					$$ = (Node *)n;
				}
		;
2237 2238 2239 2240


/*****************************************************************************
 *
2241 2242
 *		QUERY:
 *				load "filename"
2243 2244 2245
 *
 *****************************************************************************/

2246
LoadStmt:  LOAD file_name
2247 2248 2249 2250 2251 2252
				{
					LoadStmt *n = makeNode(LoadStmt);
					n->filename = $2;
					$$ = (Node *)n;
				}
		;
2253 2254 2255 2256


/*****************************************************************************
 *
2257 2258
 *		QUERY:
 *				createdb dbname
2259 2260 2261
 *
 *****************************************************************************/

2262
CreatedbStmt:  CREATE DATABASE database_name WITH opt_database1 opt_database2
2263 2264
				{
					CreatedbStmt *n = makeNode(CreatedbStmt);
2265 2266 2267
					if ($5 == NULL && $6 == NULL) {
						elog(ERROR, "CREATE DATABASE WITH requires at least an option");
					}
2268
					n->dbname = $3;
2269
					n->dbpath = $5;
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#ifdef MULTIBYTE
2271 2272 2273 2274 2275 2276 2277 2278 2279
					if ($6 != NULL) {
						n->encoding = pg_char_to_encoding($6);
						if (n->encoding < 0) {
							elog(ERROR, "invalid encoding name %s", $6);
						}
					} else {
						n->encoding = GetTemplateEncoding();
					}
#else
2280 2281
					if ($6 != NULL)
						elog(ERROR, "WITH ENCODING is not supported");
2282
					n->encoding = 0;
2283
#endif
2284 2285
					$$ = (Node *)n;
				}
2286 2287 2288 2289 2290
		| CREATE DATABASE database_name
				{
					CreatedbStmt *n = makeNode(CreatedbStmt);
					n->dbname = $3;
					n->dbpath = NULL;
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#ifdef MULTIBYTE
2292
					n->encoding = GetTemplateEncoding();
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#else
					n->encoding = 0;
2295 2296 2297 2298 2299 2300 2301
#endif
					$$ = (Node *)n;
				}
		;

opt_database1:  LOCATION '=' location			{ $$ = $3; }
		| /*EMPTY*/								{ $$ = NULL; }
2302
		;
2303

2304
opt_database2:  ENCODING '=' encoding			{ $$ = $3; }
2305 2306 2307 2308 2309 2310 2311
		| /*EMPTY*/								{ $$ = NULL; }
		;

location:  Sconst								{ $$ = $1; }
		| DEFAULT								{ $$ = NULL; }
		| /*EMPTY*/								{ $$ = NULL; }
		;
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2313 2314 2315 2316 2317
encoding:  Sconst								{ $$ = $1; }
		| DEFAULT								{ $$ = NULL; }
		| /*EMPTY*/								{ $$ = NULL; }
		;

2318 2319
/*****************************************************************************
 *
2320 2321
 *		QUERY:
 *				destroydb dbname
2322 2323 2324
 *
 *****************************************************************************/

2325 2326 2327 2328 2329 2330 2331
DestroydbStmt:	DROP DATABASE database_name
				{
					DestroydbStmt *n = makeNode(DestroydbStmt);
					n->dbname = $3;
					$$ = (Node *)n;
				}
		;
2332 2333 2334 2335


/*****************************************************************************
 *
2336 2337
 *		QUERY:
 *				cluster <index_name> on <relation_name>
2338 2339 2340
 *
 *****************************************************************************/

2341
ClusterStmt:  CLUSTER index_name ON relation_name
2342 2343 2344 2345 2346 2347 2348
				{
				   ClusterStmt *n = makeNode(ClusterStmt);
				   n->relname = $4;
				   n->indexname = $2;
				   $$ = (Node*)n;
				}
		;
2349

2350

2351 2352
/*****************************************************************************
 *
2353 2354
 *		QUERY:
 *				vacuum
2355 2356 2357
 *
 *****************************************************************************/

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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;
					$$ = (Node *)n;
				}
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		| VACUUM opt_verbose opt_analyze relation_name opt_va_list
2368 2369 2370
				{
					VacuumStmt *n = makeNode(VacuumStmt);
					n->verbose = $2;
2371 2372
					n->analyze = $3;
					n->vacrel = $4;
2373 2374
					n->va_spec = $5;
					if ( $5 != NIL && !$4 )
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						elog(ERROR,"parser: syntax error at or near \"(\"");
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					$$ = (Node *)n;
				}
		;

2380
opt_verbose:  VERBOSE							{ $$ = TRUE; }
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		| /*EMPTY*/								{ $$ = FALSE; }
2382 2383
		;

2384
opt_analyze:  ANALYZE							{ $$ = TRUE; }
2385
		| /*EMPTY*/								{ $$ = FALSE; }
2386
		;
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2388 2389
opt_va_list:  '(' va_list ')'					{ $$ = $2; }
		| /*EMPTY*/								{ $$ = NIL; }
2390
		;
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2392
va_list:  name
2393 2394 2395 2396
				{ $$=lcons($1,NIL); }
		| va_list ',' name
				{ $$=lappend($1,$3); }
		;
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2398

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/*****************************************************************************
 *
2401 2402
 *		QUERY:
 *				EXPLAIN query
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 *
 *****************************************************************************/

2406
ExplainStmt:  EXPLAIN opt_verbose OptimizableStmt
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				{
					ExplainStmt *n = makeNode(ExplainStmt);
					n->verbose = $2;
					n->query = (Query*)$3;
					$$ = (Node *)n;
				}
		;
2414

2415

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/*****************************************************************************
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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							 *
 *																			 *
2425 2426
 *****************************************************************************/

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OptimizableStmt:  SelectStmt
2428
		| CursorStmt
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		| UpdateStmt
		| InsertStmt
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		| NotifyStmt
		| DeleteStmt					/* by default all are $$=$1 */
		;
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/*****************************************************************************
 *
2438 2439
 *		QUERY:
 *				INSERT STATEMENTS
2440
 *
2441 2442
 *****************************************************************************/

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/***S*I***/
/* This rule used 'opt_column_list' between 'relation_name' and 'insert_rest'
 * originally. When the second rule of 'insert_rest' was changed to use
 * the new 'SelectStmt' rule (for INTERSECT and EXCEPT) it produced a shift/reduce
 * conflict. So I just changed the rules 'InsertStmt' and 'insert_rest' to accept
 * the same statements without any shift/reduce conflicts */
InsertStmt:  INSERT INTO relation_name  insert_rest
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				{
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 					$4->relname = $3;
					$$ = (Node *)$4;
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				}
		;
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insert_rest:  VALUES '(' res_target_list2 ')'
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				{
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					$$ = makeNode(InsertStmt);
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					$$->cols = NULL;
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					$$->unique = NULL;
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					$$->targetList = $3;
					$$->fromClause = NIL;
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					$$->whereClause = NULL;
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					$$->groupClause = NIL;
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					$$->havingClause = NULL;
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					$$->unionClause = NIL;
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				}
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		| DEFAULT VALUES
				{
					$$ = makeNode(InsertStmt);
					$$->unique = NULL;
					$$->targetList = NIL;
					$$->fromClause = NIL;
					$$->whereClause = NULL;
					$$->groupClause = NIL;
					$$->havingClause = NULL;
					$$->unionClause = NIL;
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					/***S*I***/
				 	$$->intersectClause = NIL;
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				}
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		/***S*I***/
		/* We want the full power of SelectStatements including INTERSECT and EXCEPT
                 * for insertion */
		| SelectStmt
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				{
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					SelectStmt *n;

					n = (SelectStmt *)$1;
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					$$ = makeNode(InsertStmt);
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					$$->cols = NULL;
					$$->unique = n->unique;
					$$->targetList = n->targetList;
					$$->fromClause = n->fromClause;
					$$->whereClause = n->whereClause;
					$$->groupClause = n->groupClause;
					$$->havingClause = n->havingClause;
					$$->unionClause = n->unionClause;
					$$->intersectClause = n->intersectClause;
				}
		| '(' columnList ')' VALUES '(' res_target_list2 ')'
				{
					$$ = makeNode(InsertStmt);
					$$->cols = $2;
					$$->unique = NULL;
					$$->targetList = $6;
					$$->fromClause = NIL;
					$$->whereClause = NULL;
					$$->groupClause = NIL;
					$$->havingClause = NULL;
					$$->unionClause = NIL; 
					/***S*I***/
				 	$$->intersectClause = NIL;
				}
		| '(' columnList ')' SelectStmt
				{
					SelectStmt *n;

					n = (SelectStmt *)$4;
					$$ = makeNode(InsertStmt);
					$$->cols = $2;
					$$->unique = n->unique;
					$$->targetList = n->targetList;
					$$->fromClause = n->fromClause;
					$$->whereClause = n->whereClause;
					$$->groupClause = n->groupClause;
					$$->havingClause = n->havingClause;
					$$->unionClause = n->unionClause;
					$$->intersectClause = n->intersectClause;
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				}
		;

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opt_column_list:  '(' columnList ')'			{ $$ = $2; }
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		| /*EMPTY*/								{ $$ = NIL; }
		;
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columnList:
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		  columnList ',' columnElem
				{ $$ = lappend($1, $3); }
		| columnElem
				{ $$ = lcons($1, NIL); }
		;
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columnElem:  ColId opt_indirection
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				{
					Ident *id = makeNode(Ident);
					id->name = $1;
					id->indirection = $2;
					$$ = (Node *)id;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				DELETE STATEMENTS
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 *
 *****************************************************************************/
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DeleteStmt:  DELETE FROM relation_name
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			 where_clause
				{
					DeleteStmt *n = makeNode(DeleteStmt);
					n->relname = $3;
					n->whereClause = $4;
					$$ = (Node *)n;
				}
		;
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LockStmt:	LOCK_P opt_table relation_name
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				{
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					LockStmt *n = makeNode(LockStmt);

					n->relname = $3;
					n->mode = AccessExclusiveLock;
					$$ = (Node *)n;
				}
		|	LOCK_P opt_table relation_name IN opt_lmode ROW IDENT IDENT
				{
					LockStmt *n = makeNode(LockStmt);
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					n->relname = $3;
					if (strcasecmp($8, "MODE"))
						elog(ERROR,"parser: syntax error at or near \"%s\"", $8);
					if ($5 != NULL)
					{
						if (strcasecmp($5, "SHARE"))
							elog(ERROR,"parser: syntax error at or near \"%s\"", $5);
						if (strcasecmp($7, "EXCLUSIVE"))
							elog(ERROR,"parser: syntax error at or near \"%s\"", $7);
						n->mode = ShareRowExclusiveLock;
					}
					else
					{
						if (strcasecmp($7, "SHARE") == 0)
							n->mode = RowShareLock;
						else if (strcasecmp($7, "EXCLUSIVE") == 0)
							n->mode = RowExclusiveLock;
						else
							elog(ERROR,"parser: syntax error at or near \"%s\"", $7);
					}
					$$ = (Node *)n;
				}
		|	LOCK_P opt_table relation_name IN IDENT IDENT IDENT
				{
					LockStmt *n = makeNode(LockStmt);

					n->relname = $3;
					if (strcasecmp($7, "MODE"))
						elog(ERROR,"parser: syntax error at or near \"%s\"", $7);
					if (strcasecmp($5, "ACCESS"))
						elog(ERROR,"parser: syntax error at or near \"%s\"", $5);
					if (strcasecmp($6, "SHARE") == 0)
						n->mode = AccessShareLock;
					else if (strcasecmp($6, "EXCLUSIVE") == 0)
						n->mode = AccessExclusiveLock;
					else
						elog(ERROR,"parser: syntax error at or near \"%s\"", $6);
					$$ = (Node *)n;
				}
		|	LOCK_P opt_table relation_name IN IDENT IDENT
				{
					LockStmt *n = makeNode(LockStmt);
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					n->relname = $3;
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					if (strcasecmp($6, "MODE"))
						elog(ERROR,"parser: syntax error at or near \"%s\"", $6);
					if (strcasecmp($5, "SHARE") == 0)
						n->mode = ShareLock;
					else if (strcasecmp($5, "EXCLUSIVE") == 0)
						n->mode = ExclusiveLock;
					else
						elog(ERROR,"parser: syntax error at or near \"%s\"", $5);
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					$$ = (Node *)n;
				}
		;

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opt_lmode:	IDENT		{ $$ = $1; }
		| /*EMPTY*/		{ $$ = NULL; }
		;
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/*****************************************************************************
 *
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 *		QUERY:
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 *				UpdateStmt (UPDATE)
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 *
 *****************************************************************************/

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UpdateStmt:  UPDATE relation_name
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			  SET res_target_list
			  from_clause
			  where_clause
				{
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					UpdateStmt *n = makeNode(UpdateStmt);
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					n->relname = $2;
					n->targetList = $4;
					n->fromClause = $5;
					n->whereClause = $6;
					$$ = (Node *)n;
				}
		;
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/*****************************************************************************
 *
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 *		QUERY:
 *				CURSOR STATEMENTS
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 *
 *****************************************************************************/
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/***S*I***/
CursorStmt:  DECLARE name opt_cursor CURSOR FOR SelectStmt cursor_clause
  				{
 					SelectStmt *n;
  
 					n= (SelectStmt *)$6;
  					/* from PORTAL name */
  					/*
  					 *	15 august 1991 -- since 3.0 postgres does locking
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					 *	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())
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						elog(ERROR,"Named portals may only be used in begin/end transaction blocks");
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					n->portalname = $2;
					n->binary = $3;
					$$ = (Node *)n;
				}
		;
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opt_cursor:  BINARY						{ $$ = TRUE; }
		| INSENSITIVE					{ $$ = FALSE; }
		| SCROLL						{ $$ = FALSE; }
		| INSENSITIVE SCROLL			{ $$ = FALSE; }
		| /*EMPTY*/						{ $$ = FALSE; }
		;

cursor_clause:  FOR opt_readonly		{ $$ = $2; }
		| /*EMPTY*/						{ $$ = FALSE; }
		;

opt_readonly:  READ ONLY				{ $$ = TRUE; }
		| UPDATE opt_of
			{
				elog(ERROR,"DECLARE/UPDATE not supported;"
					 " Cursors must be READ ONLY.");
				$$ = FALSE;
			}
		;

opt_of:  OF columnList
			{
				$$ = FALSE;
			}
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/*****************************************************************************
 *
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 *		QUERY:
 *				SELECT STATEMENTS
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 *
 *****************************************************************************/
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/***S*I***/
/* The new 'SelectStmt' rule adapted for the optional use of INTERSECT EXCEPT and UNION
 * accepts the use of '(' and ')' to select an order of set operations.
 * 
 * The rule returns a SelectStmt Node having the set operations attached to 
 * unionClause and intersectClause (NIL if no set operations were present) */ 
SelectStmt:	  select_w_o_sort sort_clause for_update_clause
			{
				/* There were no set operations, so just attach the sortClause */
				if IsA($1, SelectStmt)
				{
				  SelectStmt *n = (SelectStmt *)$1;
  				  n->sortClause = $2;
				  n->forUpdate = $3;
				  $$ = (Node *)n;
                }
				/* There were set operations: The root of the operator tree
				 * is delivered by $1 but we cannot hand back an A_Expr Node.
				 * So we search for the leftmost 'SelectStmt' in the operator
				 * tree $1 (which is the first Select Statement in the query 
				 * typed in by the user or where ever it came from). 
				 * 
				 * Then we attach the whole operator tree to 'intersectClause', 
				 * and a list of all 'SelectStmt' Nodes to 'unionClause' and 
				 * hand back the leftmost 'SelectStmt' Node. (We do it this way
				 * because the following functions (e.g. parse_analyze etc.)
				 * excpect a SelectStmt node and not an operator tree! The whole
				 * tree attached to 'intersectClause' won't be touched by 
				 * parse_analyze() etc. until the function 
				 * Except_Intersect_Rewrite() (in rewriteHandler.c) which performs
				 * the necessary steps to be able create a plan!) */
				else
				{
				  List *select_list = NIL;
				  SelectStmt *first_select;
				  Node *op = (Node *) $1;
				  bool intersect_present = FALSE, unionall_present = FALSE;

				  /* Take the operator tree as an argument and 
				   * create a list of all SelectStmt Nodes found in the tree.
				   *
				   * If one of the SelectStmt Nodes has the 'unionall' flag
				   * set to true the 'unionall_present' flag is also set to
				   * true */
				  create_select_list((Node *)op, &select_list, &unionall_present);

				  /* Replace all the A_Expr Nodes in the operator tree by
				   * Expr Nodes.
				   *
				   * If an INTERSECT or an EXCEPT is present, the 
				   * 'intersect_present' flag is set to true */
				  op = A_Expr_to_Expr(op, &intersect_present);

				  /* If both flags are set to true we have a UNION ALL
				   * statement mixed up with INTERSECT or EXCEPT 
				   * which can not be handled at the moment */
				  if (intersect_present && unionall_present)
				  {
				  	elog(ERROR,"UNION ALL not allowed in mixed set operations!");
				  }

				  /* Get the leftmost SeletStmt Node (which automatically
				   * represents the first Select Statement of the query!) */
				  first_select = (SelectStmt *)lfirst(select_list);

				  /* Attach the list of all SeletStmt Nodes to unionClause */
				  first_select->unionClause = select_list;

				  /* Attach the whole operator tree to intersectClause */
				  first_select->intersectClause = (List *) op;

				  /* finally attach the sort clause */
				  first_select->sortClause = $2;
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				  first_select->forUpdate = $3;
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				  $$ = (Node *)first_select;
				}		
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				if (((SelectStmt *)$$)->forUpdate != NULL)
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				{
					SelectStmt *n = (SelectStmt *)$1;

					if (n->unionClause != NULL)
						elog(ERROR, "SELECT FOR UPDATE is not allowed with UNION clause");
					if (n->unique != NULL)
						elog(ERROR, "SELECT FOR UPDATE is not allowed with DISTINCT clause");
					if (n->groupClause != NULL)
						elog(ERROR, "SELECT FOR UPDATE is not allowed with GROUP BY clause");
					if (n->havingClause != NULL)
						elog(ERROR, "SELECT FOR UPDATE is not allowed with HAVING clause");
				}
			}
		;

/***S*I***/ 
/* This rule parses Select statements including UNION INTERSECT and EXCEPT.
 * '(' and ')' can be used to specify the order of the operations 
 * (UNION EXCEPT INTERSECT). Without the use of '(' and ')' we want the
 * operations to be left associative.
 *
 *  The sort_clause is not handled here!
 * 
 * The rule builds up an operator tree using A_Expr Nodes. AND Nodes represent
 * INTERSECTs OR Nodes represent UNIONs and AND NOT nodes represent EXCEPTs. 
 * The SelectStatements to be connected are the left and right arguments to
 * the A_Expr Nodes.
 * If no set operations show up in the query the tree consists only of one
 * SelectStmt Node */
select_w_o_sort: '(' select_w_o_sort ')'
			{
				$$ = $2; 
			}
		| SubSelect
			{
				$$ = $1; 
			}
		| select_w_o_sort EXCEPT select_w_o_sort
			{
				$$ = (Node *)makeA_Expr(AND,NULL,$1,
							makeA_Expr(NOT,NULL,NULL,$3));
			}
		| select_w_o_sort UNION opt_union select_w_o_sort
			{	
				if (IsA($4, SelectStmt))
				  {
				     SelectStmt *n = (SelectStmt *)$4;
				     n->unionall = $3;
				  }
				$$ = (Node *)makeA_Expr(OR,NULL,$1,$4);
			}
		| select_w_o_sort INTERSECT select_w_o_sort
			{
				$$ = (Node *)makeA_Expr(AND,NULL,$1,$3);
			}
		; 
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/***S*I***/
SubSelect:	SELECT opt_unique res_target_list2
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			 result from_clause where_clause
			 group_clause having_clause
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				{
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					SelectStmt *n = makeNode(SelectStmt);
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					n->unique = $2;
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					n->unionall = FALSE;
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					n->targetList = $3;
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					/***S*I***/
					/* This is new: Subselects support the INTO clause
					 * which allows queries that are not part of the
					 * SQL92 standard and should not be formulated!
					 * We need it for INTERSECT and EXCEPT and I did not
					 * want to create a new rule 'SubSelect1' including the
					 * feature. If it makes troubles we will have to add 
					 * a new rule and change this to prevent INTOs in 
					 * Subselects again */ 
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					n->into = $4;
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					n->fromClause = $5;
					n->whereClause = $6;
					n->groupClause = $7;
					n->havingClause = $8;
					$$ = (Node *)n;
				}
		;
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result:  INTO opt_table relation_name			{ $$= $3; }
		| /*EMPTY*/								{ $$ = NULL; }
		;

opt_table:  TABLE								{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
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		;
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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: a_expr OptUseOp
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				{
					$$ = makeNode(SortGroupBy);
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					$$->node = $1;
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					$$->useOp = $2;
				}
		;

OptUseOp:  USING Op								{ $$ = $2; }
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		| USING '<'								{ $$ = "<"; }
		| USING '>'								{ $$ = ">"; }
		| ASC									{ $$ = "<"; }
		| DESC									{ $$ = ">"; }
		| /*EMPTY*/								{ $$ = "<"; /*default*/ }
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		;
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/*
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 *	jimmy bell-style recursive queries aren't supported in the
 *	current system.
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 *
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 *	...however, recursive addattr and rename supported.  make special
 *	cases for these.
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 */
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opt_inh_star:  '*'								{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
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		;
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relation_name_list:  name_list;
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name_list:  name
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				{	$$ = lcons(makeString($1),NIL); }
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		| name_list ',' name
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				{	$$ = lappend($1,makeString($3)); }
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		;
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group_clause:  GROUP BY expr_list			{ $$ = $3; }
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		| /*EMPTY*/								{ $$ = NIL; }
		;
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having_clause:  HAVING a_expr
				{
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					$$ = $2;
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				}
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		| /*EMPTY*/								{ $$ = NULL; }
		;
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for_update_clause:
			FOR UPDATE
			{
				$$ = lcons(NULL, NULL);
			}
		|	FOR UPDATE OF va_list
			{
				$$ = $4;
			}
		| /* EMPTY */
			{
				$$ = NULL;
			}
		;
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/*****************************************************************************
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 *
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 *	clauses common to all Optimizable Stmts:
 *		from_clause		-
 *		where_clause	-
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 *
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 *****************************************************************************/

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

from_list:	from_list ',' from_val
				{ $$ = lappend($1, $3); }
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		| from_val CROSS JOIN from_val
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				{ elog(ERROR,"CROSS JOIN not yet implemented"); }
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		| from_val
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				{ $$ = lcons($1, NIL); }
		;
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from_val:  relation_expr AS ColLabel
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				{
					$$ = makeNode(RangeVar);
					$$->relExpr = $1;
					$$->name = $3;
				}
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		| relation_expr ColId
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				{
					$$ = makeNode(RangeVar);
					$$->relExpr = $1;
					$$->name = $2;
				}
		| relation_expr
				{
					$$ = makeNode(RangeVar);
					$$->relExpr = $1;
					$$->name = NULL;
				}
		;
3017

3018
join_expr:  NATURAL join_expr					{ $$ = NULL; }
3019
		| FULL join_outer
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3020
				{ elog(ERROR,"FULL OUTER JOIN not yet implemented"); }
3021
		| LEFT join_outer
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3022
				{ elog(ERROR,"LEFT OUTER JOIN not yet implemented"); }
3023
		| RIGHT join_outer
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3024
				{ elog(ERROR,"RIGHT OUTER JOIN not yet implemented"); }
3025
		| OUTER_P
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3026
				{ elog(ERROR,"OUTER JOIN not yet implemented"); }
3027
		| INNER_P
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3028
				{ elog(ERROR,"INNER JOIN not yet implemented"); }
3029
		| UNION
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3030
				{ elog(ERROR,"UNION JOIN not yet implemented"); }
3031
		| /*EMPTY*/
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				{ elog(ERROR,"INNER JOIN not yet implemented"); }
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		;

3035 3036
join_outer:  OUTER_P							{ $$ = NULL; }
		| /*EMPTY*/								{ $$ = NULL;  /* no qualifiers */ }
3037 3038
		;

3039 3040 3041
join_spec:	ON '(' a_expr ')'					{ $$ = NULL; }
		| USING '(' join_list ')'				{ $$ = NULL; }
		| /*EMPTY*/								{ $$ = NULL;  /* no qualifiers */ }
3042 3043
		;

3044
join_list:  join_using							{ $$ = lcons($1, NIL); }
3045 3046
		| join_list ',' join_using				{ $$ = lappend($1, $3); }
		;
3047

3048
join_using:  ColId
3049 3050 3051 3052 3053 3054 3055 3056 3057 3058
				/*  Changed from SortGroupBy parse node to new JoinUsing node.
			  	 *  SortGroupBy no longer needs these structure members.
				 *
			  	 *  Once, acknowledged, this comment can be removed by the
				 *  developer(s) working on the JOIN clause.
				 *
			  	 *    - daveh@insightdist.com  1998-07-31
				 */ 
				{
					$$ = makeNode(JoinUsing);
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					$$->resno = 0;
					$$->range = NULL;
					$$->name = $1;
				}
3063
		| ColId '.' ColId
3064
				{
3065
					$$ = makeNode(JoinUsing);
3066 3067 3068 3069 3070 3071
					$$->resno = 0;
					$$->range = $1;
					$$->name = $3;
				}
		| Iconst
				{
3072
					$$ = makeNode(JoinUsing);
3073 3074 3075 3076 3077 3078
					$$->resno = $1;
					$$->range = NULL;
					$$->name = NULL;
				}
		;

3079 3080
where_clause:  WHERE a_expr						{ $$ = $2; }
		| /*EMPTY*/								{ $$ = NULL;  /* no qualifiers */ }
3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091
		;

relation_expr:	relation_name
				{
					/* normal relations */
					$$ = makeNode(RelExpr);
					$$->relname = $1;
					$$->inh = FALSE;
				}
		| relation_name '*'				  %prec '='
				{
3092
					/* inheritance query */
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					$$ = makeNode(RelExpr);
					$$->relname = $1;
					$$->inh = TRUE;
				}
3097 3098

opt_array_bounds:  '[' ']' nest_array_bounds
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				{  $$ = lcons(makeInteger(-1), $3); }
		| '[' Iconst ']' nest_array_bounds
				{  $$ = lcons(makeInteger($2), $4); }
3102
		| /*EMPTY*/
3103 3104 3105 3106 3107 3108 3109 3110 3111 3112
				{  $$ = NIL; }
		;

nest_array_bounds:	'[' ']' nest_array_bounds
				{  $$ = lcons(makeInteger(-1), $3); }
		| '[' Iconst ']' nest_array_bounds
				{  $$ = lcons(makeInteger($2), $4); }
		| /*EMPTY*/
				{  $$ = NIL; }
		;
3113

3114

3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128
/*****************************************************************************
 *
 *	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;
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					/* Is this the name of a complex type? If so, implement
					 * it as a set.
					 */
3133
					if (!strcmp(saved_relname, $$->name))
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						/* This attr is the same type as the relation
						 * being defined. The classic example: create
						 * emp(name=text,mgr=emp)
						 */
						$$->setof = TRUE;
3139
					else if (typeTypeRelid(typenameType($$->name)) != InvalidOid)
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						 /* (Eventually add in here that the set can only
						  * contain one element.)
						  */
						$$->setof = TRUE;
					else
						$$->setof = FALSE;
				}
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		| Character
		| SETOF Array
3149
				{
3150
					$$ = $2;
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					$$->setof = TRUE;
				}
		;

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Array:  Generic
		| Datetime
		| Numeric
3158
		;
3159

3160
Generic:  generic
3161
				{
3162 3163
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType($1);
3164
					$$->typmod = -1;
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				}
		;

3168
generic:  IDENT									{ $$ = $1; }
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		| TYPE_P								{ $$ = xlateSqlType("type"); }
		;

/* SQL92 numeric data types
 * Check FLOAT() precision limits assuming IEEE floating types.
3174
 * Provide real DECIMAL() and NUMERIC() implementations now - Jan 1998-12-30
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 * - thomas 1997-09-18
 */
Numeric:  FLOAT opt_float
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType($2);
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					$$->typmod = -1;
3182
				}
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		| DOUBLE PRECISION
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType("float");
				}
3188
		| DECIMAL opt_decimal
3189
				{
3190
					$$ = makeNode(TypeName);
3191
					$$->name = xlateSqlType("numeric");
3192
					$$->typmod = -1;
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				}
		| NUMERIC opt_numeric
				{
					$$ = makeNode(TypeName);
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					$$->name = xlateSqlType("numeric");
					$$->typmod = $2;
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				}
		;
3201

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numeric:  FLOAT
				{	$$ = xlateSqlType("float8"); }
		| DOUBLE PRECISION
				{	$$ = xlateSqlType("float8"); }
		| DECIMAL
3207
				{	$$ = xlateSqlType("numeric"); }
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		| NUMERIC
				{	$$ = xlateSqlType("numeric"); }
		;

3212 3213 3214
opt_float:  '(' Iconst ')'
				{
					if ($2 < 1)
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						elog(ERROR,"precision for FLOAT must be at least 1");
3216 3217 3218 3219 3220
					else if ($2 < 7)
						$$ = xlateSqlType("float4");
					else if ($2 < 16)
						$$ = xlateSqlType("float8");
					else
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3221
						elog(ERROR,"precision for FLOAT must be less than 16");
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				}
		| /*EMPTY*/
				{
					$$ = xlateSqlType("float8");
				}
		;

opt_numeric:  '(' Iconst ',' Iconst ')'
				{
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					if ($2 < 1 || $2 > NUMERIC_MAX_PRECISION)
						elog(ERROR,"NUMERIC precision %d must be beween 1 and %d",
									$2, NUMERIC_MAX_PRECISION);
					if ($4 < 0 || $4 > $2)
						elog(ERROR,"NUMERIC scale %d must be between 0 and precision %d",
									$4,$2);

					$$ = (($2 << 16) | $4) + VARHDRSZ;
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				}
		| '(' Iconst ')'
				{
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					if ($2 < 1 || $2 > NUMERIC_MAX_PRECISION)
						elog(ERROR,"NUMERIC precision %d must be beween 1 and %d",
									$2, NUMERIC_MAX_PRECISION);

					$$ = ($2 << 16) + VARHDRSZ;
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				}
		| /*EMPTY*/
				{
3250
					$$ = ((NUMERIC_DEFAULT_PRECISION << 16) | NUMERIC_DEFAULT_SCALE) + VARHDRSZ;
3251 3252 3253 3254 3255
				}
		;

opt_decimal:  '(' Iconst ',' Iconst ')'
				{
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					if ($2 < 1 || $2 > NUMERIC_MAX_PRECISION)
						elog(ERROR,"DECIMAL precision %d must be beween 1 and %d",
									$2, NUMERIC_MAX_PRECISION);
					if ($4 < 0 || $4 > $2)
						elog(ERROR,"DECIMAL scale %d must be between 0 and precision %d",
									$4,$2);

					$$ = (($2 << 16) | $4) + VARHDRSZ;
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				}
		| '(' Iconst ')'
				{
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					if ($2 < 1 || $2 > NUMERIC_MAX_PRECISION)
						elog(ERROR,"DECIMAL precision %d must be beween 1 and %d",
									$2, NUMERIC_MAX_PRECISION);

					$$ = ($2 << 16) + VARHDRSZ;
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				}
		| /*EMPTY*/
				{
3275
					$$ = ((NUMERIC_DEFAULT_PRECISION << 16) | NUMERIC_DEFAULT_SCALE) + VARHDRSZ;
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				}
		;

3279

3280 3281 3282 3283 3284 3285 3286 3287 3288 3289
/* 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 ')'
				{
					$$ = makeNode(TypeName);
3290
					if (strcasecmp($1, "char") == 0)
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						$$->name = xlateSqlType("bpchar");
3292
					else if (strcasecmp($1, "varchar") == 0)
3293 3294
						$$->name = xlateSqlType("varchar");
					else
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						yyerror("internal parsing error; unrecognized character type");

3297
					if ($3 < 1)
3298
						elog(ERROR,"length for '%s' type must be at least 1",$1);
3299 3300 3301 3302 3303
					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
3304
						 */
3305
						elog(ERROR,"length for type '%s' cannot exceed 4096",$1);
3306 3307 3308 3309 3310 3311

					/* 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
					 */
3312
					$$->typmod = VARHDRSZ + $3;
3313
				}
3314
		| character
3315 3316
				{
					$$ = makeNode(TypeName);
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					/* Let's try to make all single-character types into bpchar(1)
					 * - thomas 1998-05-07
					 */
					if (strcasecmp($1, "char") == 0)
					{
						$$->name = xlateSqlType("bpchar");
						$$->typmod = VARHDRSZ + 1;
					}
					else
					{
						$$->name = xlateSqlType($1);
						$$->typmod = -1;
					}
3330 3331
				}
		;
3332

3333 3334 3335 3336 3337 3338
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");
3339
					} else {
3340 3341 3342 3343 3344 3345 3346 3347 3348 3349
						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)
3350
						elog(NOTICE,"COLLATE %s not yet implemented; clause ignored",$4);
3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374
					$$ = type;
				}
		| CHAR opt_varying						{ $$ = 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);
3375
					$$->typmod = -1;
3376 3377 3378 3379 3380 3381
				}
		| TIMESTAMP opt_timezone
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType("timestamp");
					$$->timezone = $2;
3382
					$$->typmod = -1;
3383 3384 3385 3386 3387
				}
		| TIME
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType("time");
3388
					$$->typmod = -1;
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				}
		| INTERVAL opt_interval
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType("interval");
3394
					$$->typmod = -1;
3395
				}
3396
		;
3397

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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					{ $$ = NIL; }
3417
		| MINUTE_P TO SECOND_P					{ $$ = NIL; }
3418
		| /*EMPTY*/								{ $$ = NIL; }
3419 3420
		;

3421 3422 3423

/*****************************************************************************
 *
3424
 *	expression grammar, still needs some cleanup
3425 3426 3427
 *
 *****************************************************************************/

3428
a_expr_or_null:  a_expr
3429
				{ $$ = $1; }
3430
		| NULL_P
3431 3432 3433 3434 3435
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Null;
					$$ = (Node *)n;
				}
3436 3437 3438 3439 3440
		;

/* Expressions using row descriptors
 * Define row_descriptor to allow yacc to break the reduce/reduce conflict
 *  with singleton expressions.
3441 3442 3443 3444 3445
 * Eliminated lots of code by defining row_op and sub_type clauses.
 * However, can not consolidate EXPR_LINK case with others subselects
 *  due to shift/reduce conflict with the non-subselect clause (the parser
 *  would have to look ahead more than one token to resolve the conflict).
 * - thomas 1998-05-09
3446 3447 3448
 */
row_expr: '(' row_descriptor ')' IN '(' SubSelect ')'
				{
3449 3450
					SubLink *n = makeNode(SubLink);
					n->lefthand = $2;
3451 3452 3453
					n->oper = lcons("=",NIL);
					n->useor = false;
					n->subLinkType = ANY_SUBLINK;
3454 3455
					n->subselect = $6;
					$$ = (Node *)n;
3456 3457 3458
				}
		| '(' row_descriptor ')' NOT IN '(' SubSelect ')'
				{
3459 3460
					SubLink *n = makeNode(SubLink);
					n->lefthand = $2;
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					n->oper = lcons("<>",NIL);
					n->useor = true;
					n->subLinkType = ALL_SUBLINK;
					n->subselect = $7;
					$$ = (Node *)n;
				}
3467
		| '(' row_descriptor ')' row_op sub_type '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = $2;
					n->oper = lcons($4, NIL);
					if (strcmp($4,"<>") == 0)
						n->useor = true;
					else
						n->useor = false;
3476
					n->subLinkType = $5;
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3477 3478 3479
					n->subselect = $7;
					$$ = (Node *)n;
				}
3480
		| '(' row_descriptor ')' row_op '(' SubSelect ')'
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3481 3482 3483
				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = $2;
3484
					n->oper = lcons($4, NIL);
3485 3486 3487 3488
					if (strcmp($4,"<>") == 0)
						n->useor = true;
					else
						n->useor = false;
3489 3490
					n->subLinkType = EXPR_SUBLINK;
					n->subselect = $6;
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3491 3492
					$$ = (Node *)n;
				}
3493
		| '(' row_descriptor ')' row_op '(' row_descriptor ')'
3494
				{
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3495
					$$ = makeRowExpr($4, $2, $6);
3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513
				}
		;

row_descriptor:  row_list ',' a_expr
				{
					$$ = lappend($1, $3);
				}
		;

row_list:  row_list ',' a_expr
				{
					$$ = lappend($1, $3);
				}
		| a_expr
				{
					$$ = lcons($1, NIL);
				}
		;
3514

3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528
row_op:  Op									{ $$ = $1; }
		| '<'								{ $$ = "<"; }
		| '='								{ $$ = "="; }
		| '>'								{ $$ = ">"; }
		| '+'								{ $$ = "+"; }
		| '-'								{ $$ = "-"; }
		| '*'								{ $$ = "*"; }
		| '/'								{ $$ = "/"; }
		;

sub_type:  ANY								{ $$ = ANY_SUBLINK; }
		| ALL								{ $$ = ALL_SUBLINK; }
		;

3529
/* General expressions
3530 3531 3532 3533
 * This is the heart of the expression syntax.
 * Note that the BETWEEN clause looks similar to a boolean expression
 *  and so we must define b_expr which is almost the same as a_expr
 *  but without the boolean expressions.
3534 3535
 * All operations/expressions are allowed in a BETWEEN clause
 *  if surrounded by parens.
3536
 */
3537
a_expr:  attr opt_indirection
3538 3539 3540 3541
				{
					$1->indirection = $2;
					$$ = (Node *)$1;
				}
3542 3543
		| row_expr
				{	$$ = $1;  }
3544 3545
		| AexprConst
				{	$$ = $1;  }
3546 3547 3548 3549 3550 3551 3552 3553
		| ColId
				{
					/* could be a column name or a relation_name */
					Ident *n = makeNode(Ident);
					n->name = $1;
					n->indirection = NULL;
					$$ = (Node *)n;
				}
3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575
		| '-' 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
				{	$$ = makeA_Expr(OP, "|", NULL, $2); }
3576
		| a_expr TYPECAST Typename
3577
				{
3578
					$$ = (Node *)$1;
3579
					/* AexprConst can be either A_Const or ParamNo */
3580
					if (nodeTag($1) == T_A_Const) {
3581
						((A_Const *)$1)->typename = $3;
3582
					} else if (nodeTag($1) == T_Param) {
3583
						((ParamNo *)$1)->typename = $3;
3584 3585 3586 3587 3588 3589 3590
					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
						n->funcname = $3->name;
						n->args = lcons($1,NIL);
						$$ = (Node *)n;
					}
3591
				}
3592
		| CAST '(' a_expr AS Typename ')'
3593
				{
3594
					$$ = (Node *)$3;
3595
					/* AexprConst can be either A_Const or ParamNo */
3596 3597 3598 3599
					if (nodeTag($3) == T_A_Const) {
						((A_Const *)$3)->typename = $5;
					} else if (nodeTag($5) == T_Param) {
						((ParamNo *)$3)->typename = $5;
3600 3601 3602
					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
3603 3604
						n->funcname = $5->name;
						n->args = lcons($3,NIL);
3605 3606
						$$ = (Node *)n;
					}
3607 3608 3609 3610
				}
		| '(' a_expr_or_null ')'
				{	$$ = $2; }
		| a_expr Op a_expr
3611
				{	$$ = makeIndexable($2,$1,$3);	}
3612
		| a_expr LIKE a_expr
3613
				{	$$ = makeIndexable("~~", $1, $3); }
3614 3615 3616 3617 3618 3619
		| 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); }
3620
		| func_name '(' '*' ')'
3621
				{
3622
					/* cheap hack for aggregate (eg. count) */
3623
					FuncCall *n = makeNode(FuncCall);
3624
					A_Const *star = makeNode(A_Const);
3625

3626 3627
					star->val.type = T_String;
					star->val.val.str = "";
3628 3629 3630 3631
					n->funcname = $1;
					n->args = lcons(star, NIL);
					$$ = (Node *)n;
				}
3632
		| func_name '(' ')'
3633 3634 3635 3636
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
3637 3638
					$$ = (Node *)n;
				}
3639
		| func_name '(' expr_list ')'
3640 3641 3642 3643 3644 3645
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					$$ = (Node *)n;
				}
3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656
		| 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;
3657 3658
					t->typmod = -1;
 
3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671
					$$ = (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;
3672
					t->typmod = -1;
3673 3674 3675

					$$ = (Node *)n;
				}
3676
		| CURRENT_TIME '(' Iconst ')'
3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690
				{
					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;
3691
					t->typmod = -1;
3692

3693
					if ($3 != 0)
3694
						elog(NOTICE,"CURRENT_TIME(%d) precision not implemented; zero used instead",$3);
3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708

					$$ = (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;
3709
					t->typmod = -1;
3710 3711 3712

					$$ = (Node *)n;
				}
3713
		| CURRENT_TIMESTAMP '(' Iconst ')'
3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727
				{
					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;
3728
					t->typmod = -1;
3729

3730
					if ($3 != 0)
3731
						elog(NOTICE,"CURRENT_TIMESTAMP(%d) precision not implemented; zero used instead",$3);
3732

3733 3734
					$$ = (Node *)n;
				}
3735
		| CURRENT_USER
3736 3737 3738 3739 3740 3741
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "getpgusername";
					n->args = NIL;
					$$ = (Node *)n;
				}
3742 3743 3744 3745 3746 3747 3748
		| USER
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "getpgusername";
					n->args = NIL;
					$$ = (Node *)n;
				}
3749 3750
		| EXISTS '(' SubSelect ')'
				{
3751 3752
					SubLink *n = makeNode(SubLink);
					n->lefthand = NIL;
3753
					n->useor = false;
3754
					n->oper = NIL;
3755
					n->subLinkType = EXISTS_SUBLINK;
3756 3757
					n->subselect = $3;
					$$ = (Node *)n;
3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810
				}
		| 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;
					$$ = (Node *)n;
				}
		| a_expr ISNULL
				{	$$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
3811
		| a_expr IS NULL_P
3812 3813 3814
				{	$$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
		| a_expr NOTNULL
				{	$$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
3815
		| a_expr IS NOT NULL_P
3816
				{	$$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
3817 3818 3819 3820 3821
		/* IS TRUE, IS FALSE, etc used to be function calls
		 *  but let's make them expressions to allow the optimizer
		 *  a chance to eliminate them if a_expr is a constant string.
		 * - thomas 1997-12-22
		 */
3822 3823
		| a_expr IS TRUE_P
				{
3824 3825 3826 3827 3828
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "t";
					n->typename = makeNode(TypeName);
					n->typename->name = xlateSqlType("bool");
3829
					n->typename->typmod = -1;
3830
					$$ = makeA_Expr(OP, "=", $1,(Node *)n);
3831
				}
3832
		| a_expr IS NOT FALSE_P
3833
				{
3834 3835 3836 3837 3838
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "t";
					n->typename = makeNode(TypeName);
					n->typename->name = xlateSqlType("bool");
3839
					n->typename->typmod = -1;
3840
					$$ = makeA_Expr(OP, "=", $1,(Node *)n);
3841
				}
3842
		| a_expr IS FALSE_P
3843
				{
3844 3845 3846 3847 3848
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "f";
					n->typename = makeNode(TypeName);
					n->typename->name = xlateSqlType("bool");
3849
					n->typename->typmod = -1;
3850
					$$ = makeA_Expr(OP, "=", $1,(Node *)n);
3851
				}
3852
		| a_expr IS NOT TRUE_P
3853
				{
3854 3855 3856 3857 3858
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "f";
					n->typename = makeNode(TypeName);
					n->typename->name = xlateSqlType("bool");
3859
					n->typename->typmod = -1;
3860
					$$ = makeA_Expr(OP, "=", $1,(Node *)n);
3861
				}
3862
		| a_expr BETWEEN b_expr AND b_expr
3863 3864 3865 3866 3867
				{
					$$ = makeA_Expr(AND, NULL,
						makeA_Expr(OP, ">=", $1, $3),
						makeA_Expr(OP, "<=", $1, $5));
				}
3868
		| a_expr NOT BETWEEN b_expr AND b_expr
3869 3870 3871 3872 3873
				{
					$$ = makeA_Expr(OR, NULL,
						makeA_Expr(OP, "<", $1, $4),
						makeA_Expr(OP, ">", $1, $6));
				}
3874
		| a_expr IN { saved_In_Expr = lcons($1,saved_In_Expr); } '(' in_expr ')'
3875
				{
3876
					saved_In_Expr = lnext(saved_In_Expr);
3877 3878
					if (nodeTag($5) == T_SubLink)
					{
3879 3880 3881 3882 3883 3884
							SubLink *n = (SubLink *)$5;
							n->lefthand = lcons($1, NIL);
							n->oper = lcons("=",NIL);
							n->useor = false;
							n->subLinkType = ANY_SUBLINK;
							$$ = (Node *)n;
3885 3886 3887
					}
					else	$$ = $5;
				}
3888
		| a_expr NOT IN { saved_In_Expr = lcons($1,saved_In_Expr); } '(' not_in_expr ')'
3889
				{
3890
					saved_In_Expr = lnext(saved_In_Expr);
3891 3892
					if (nodeTag($6) == T_SubLink)
					{
3893 3894 3895 3896 3897 3898
							SubLink *n = (SubLink *)$6;
							n->lefthand = lcons($1, NIL);
							n->oper = lcons("<>",NIL);
							n->useor = false;
							n->subLinkType = ALL_SUBLINK;
							$$ = (Node *)n;
3899 3900 3901
					}
					else	$$ = $6;
				}
3902
		| a_expr Op '(' SubSelect ')'
3903 3904
				{
					SubLink *n = makeNode(SubLink);
3905
					n->lefthand = lcons($1, NULL);
3906 3907
					n->oper = lcons($2,NIL);
					n->useor = false;
3908 3909
					n->subLinkType = EXPR_SUBLINK;
					n->subselect = $4;
3910 3911
					$$ = (Node *)n;
				}
3912
		| a_expr '+' '(' SubSelect ')'
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3913 3914
				{
					SubLink *n = makeNode(SubLink);
3915
					n->lefthand = lcons($1, NULL);
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3916 3917
					n->oper = lcons("+",NIL);
					n->useor = false;
3918 3919
					n->subLinkType = EXPR_SUBLINK;
					n->subselect = $4;
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3920 3921
					$$ = (Node *)n;
				}
3922
		| a_expr '-' '(' SubSelect ')'
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3923 3924
				{
					SubLink *n = makeNode(SubLink);
3925
					n->lefthand = lcons($1, NULL);
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3926 3927
					n->oper = lcons("-",NIL);
					n->useor = false;
3928 3929
					n->subLinkType = EXPR_SUBLINK;
					n->subselect = $4;
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3930 3931
					$$ = (Node *)n;
				}
3932
		| a_expr '/' '(' SubSelect ')'
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3933 3934
				{
					SubLink *n = makeNode(SubLink);
3935
					n->lefthand = lcons($1, NULL);
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3936 3937
					n->oper = lcons("/",NIL);
					n->useor = false;
3938 3939
					n->subLinkType = EXPR_SUBLINK;
					n->subselect = $4;
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3940 3941
					$$ = (Node *)n;
				}
3942
		| a_expr '*' '(' SubSelect ')'
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3943 3944
				{
					SubLink *n = makeNode(SubLink);
3945
					n->lefthand = lcons($1, NULL);
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3946 3947
					n->oper = lcons("*",NIL);
					n->useor = false;
3948 3949
					n->subLinkType = EXPR_SUBLINK;
					n->subselect = $4;
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3950 3951
					$$ = (Node *)n;
				}
3952
		| a_expr '<' '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
3955
					n->lefthand = lcons($1, NULL);
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3956 3957
					n->oper = lcons("<",NIL);
					n->useor = false;
3958 3959
					n->subLinkType = EXPR_SUBLINK;
					n->subselect = $4;
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3960 3961
					$$ = (Node *)n;
				}
3962
		| a_expr '>' '(' SubSelect ')'
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3963 3964
				{
					SubLink *n = makeNode(SubLink);
3965
					n->lefthand = lcons($1, NULL);
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3966 3967
					n->oper = lcons(">",NIL);
					n->useor = false;
3968 3969
					n->subLinkType = EXPR_SUBLINK;
					n->subselect = $4;
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3970 3971
					$$ = (Node *)n;
				}
3972
		| a_expr '=' '(' SubSelect ')'
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3973 3974
				{
					SubLink *n = makeNode(SubLink);
3975
					n->lefthand = lcons($1, NULL);
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3976 3977
					n->oper = lcons("=",NIL);
					n->useor = false;
3978 3979
					n->subLinkType = EXPR_SUBLINK;
					n->subselect = $4;
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3980 3981
					$$ = (Node *)n;
				}
3982
		| a_expr Op ANY '(' SubSelect ')'
3983 3984
				{
					SubLink *n = makeNode(SubLink);
3985
					n->lefthand = lcons($1,NIL);
3986 3987
					n->oper = lcons($2,NIL);
					n->useor = false;
3988
					n->subLinkType = ANY_SUBLINK;
3989 3990 3991
					n->subselect = $5;
					$$ = (Node *)n;
				}
3992
		| a_expr '+' ANY '(' SubSelect ')'
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3993 3994
				{
					SubLink *n = makeNode(SubLink);
3995
					n->lefthand = lcons($1,NIL);
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3996 3997
					n->oper = lcons("+",NIL);
					n->useor = false;
3998
					n->subLinkType = ANY_SUBLINK;
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3999 4000 4001
					n->subselect = $5;
					$$ = (Node *)n;
				}
4002
		| a_expr '-' ANY '(' SubSelect ')'
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4003 4004
				{
					SubLink *n = makeNode(SubLink);
4005
					n->lefthand = lcons($1,NIL);
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4006 4007
					n->oper = lcons("-",NIL);
					n->useor = false;
4008
					n->subLinkType = ANY_SUBLINK;
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4009 4010 4011
					n->subselect = $5;
					$$ = (Node *)n;
				}
4012
		| a_expr '/' ANY '(' SubSelect ')'
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4013 4014
				{
					SubLink *n = makeNode(SubLink);
4015
					n->lefthand = lcons($1,NIL);
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4016 4017
					n->oper = lcons("/",NIL);
					n->useor = false;
4018
					n->subLinkType = ANY_SUBLINK;
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4019 4020 4021
					n->subselect = $5;
					$$ = (Node *)n;
				}
4022
		| a_expr '*' ANY '(' SubSelect ')'
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4023 4024
				{
					SubLink *n = makeNode(SubLink);
4025
					n->lefthand = lcons($1,NIL);
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					n->oper = lcons("*",NIL);
					n->useor = false;
4028
					n->subLinkType = ANY_SUBLINK;
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4029 4030 4031
					n->subselect = $5;
					$$ = (Node *)n;
				}
4032
		| a_expr '<' ANY '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
4035
					n->lefthand = lcons($1,NIL);
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					n->oper = lcons("<",NIL);
					n->useor = false;
4038
					n->subLinkType = ANY_SUBLINK;
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					n->subselect = $5;
					$$ = (Node *)n;
				}
4042
		| a_expr '>' ANY '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
4045
					n->lefthand = lcons($1,NIL);
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					n->oper = lcons(">",NIL);
					n->useor = false;
4048
					n->subLinkType = ANY_SUBLINK;
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					n->subselect = $5;
					$$ = (Node *)n;
				}
4052
		| a_expr '=' ANY '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
4055
					n->lefthand = lcons($1,NIL);
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					n->oper = lcons("=",NIL);
					n->useor = false;
4058
					n->subLinkType = ANY_SUBLINK;
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					n->subselect = $5;
					$$ = (Node *)n;
				}
4062
		| a_expr Op ALL '(' SubSelect ')'
4063 4064 4065 4066 4067 4068
				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = lcons($1, NULL);
					n->oper = lcons($2,NIL);
					n->useor = false;
					n->subLinkType = ALL_SUBLINK;
4069
					n->subselect = $5;
4070 4071
					$$ = (Node *)n;
				}
4072
		| a_expr '+' ALL '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = lcons($1, NULL);
					n->oper = lcons("+",NIL);
					n->useor = false;
					n->subLinkType = ALL_SUBLINK;
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					n->subselect = $5;
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					$$ = (Node *)n;
				}
4082
		| a_expr '-' ALL '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = lcons($1, NULL);
					n->oper = lcons("-",NIL);
					n->useor = false;
					n->subLinkType = ALL_SUBLINK;
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					n->subselect = $5;
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					$$ = (Node *)n;
				}
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		| a_expr '/' ALL '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = lcons($1, NULL);
					n->oper = lcons("/",NIL);
					n->useor = false;
					n->subLinkType = ALL_SUBLINK;
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					n->subselect = $5;
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					$$ = (Node *)n;
				}
4102
		| a_expr '*' ALL '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = lcons($1, NULL);
					n->oper = lcons("*",NIL);
					n->useor = false;
					n->subLinkType = ALL_SUBLINK;
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					n->subselect = $5;
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					$$ = (Node *)n;
				}
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		| a_expr '<' ALL '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = lcons($1, NULL);
					n->oper = lcons("<",NIL);
					n->useor = false;
					n->subLinkType = ALL_SUBLINK;
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					n->subselect = $5;
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					$$ = (Node *)n;
				}
4122
		| a_expr '>' ALL '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = lcons($1, NULL);
					n->oper = lcons(">",NIL);
					n->useor = false;
					n->subLinkType = ALL_SUBLINK;
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					n->subselect = $5;
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					$$ = (Node *)n;
				}
4132
		| a_expr '=' ALL '(' SubSelect ')'
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				{
					SubLink *n = makeNode(SubLink);
					n->lefthand = lcons($1, NULL);
					n->oper = lcons("=",NIL);
					n->useor = false;
					n->subLinkType = ALL_SUBLINK;
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					n->subselect = $5;
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					$$ = (Node *)n;
				}
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		| a_expr AND a_expr
				{	$$ = 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); }
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		| case_expr
				{	$$ = $1; }
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		;
4151

4152
/* Restricted expressions
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 * b_expr is a subset of the complete expression syntax
 *  defined by a_expr. b_expr is used in BETWEEN clauses
 *  to eliminate parser ambiguities stemming from the AND keyword.
 */
b_expr:  attr opt_indirection
				{
					$1->indirection = $2;
					$$ = (Node *)$1;
				}
		| AexprConst
				{	$$ = $1;  }
		| ColId
				{
					/* could be a column name or a relation_name */
					Ident *n = makeNode(Ident);
					n->name = $1;
					n->indirection = NULL;
					$$ = (Node *)n;
				}
		| '-' b_expr %prec UMINUS
				{	$$ = makeA_Expr(OP, "-", NULL, $2); }
		| b_expr '+' b_expr
				{	$$ = makeA_Expr(OP, "+", $1, $3); }
		| b_expr '-' b_expr
				{	$$ = makeA_Expr(OP, "-", $1, $3); }
		| b_expr '/' b_expr
				{	$$ = makeA_Expr(OP, "/", $1, $3); }
		| b_expr '*' b_expr
				{	$$ = makeA_Expr(OP, "*", $1, $3); }
		| ':' b_expr
				{	$$ = makeA_Expr(OP, ":", NULL, $2); }
		| ';' b_expr
				{	$$ = makeA_Expr(OP, ";", NULL, $2); }
		| '|' b_expr
				{	$$ = makeA_Expr(OP, "|", NULL, $2); }
		| b_expr TYPECAST Typename
				{
					$$ = (Node *)$1;
					/* AexprConst can be either A_Const or ParamNo */
					if (nodeTag($1) == T_A_Const) {
						((A_Const *)$1)->typename = $3;
					} else if (nodeTag($1) == T_Param) {
						((ParamNo *)$1)->typename = $3;
					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
						n->funcname = $3->name;
						n->args = lcons($1,NIL);
						$$ = (Node *)n;
					}
				}
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		| CAST '(' b_expr AS Typename ')'
4205
				{
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					$$ = (Node *)$3;
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					/* AexprConst can be either A_Const or ParamNo */
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					if (nodeTag($3) == T_A_Const) {
						((A_Const *)$3)->typename = $5;
					} else if (nodeTag($3) == T_Param) {
						((ParamNo *)$3)->typename = $5;
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					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
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						n->funcname = $5->name;
						n->args = lcons($3,NIL);
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						$$ = (Node *)n;
					}
				}
		| '(' a_expr ')'
				{	$$ = $2; }
		| b_expr Op b_expr
				{	$$ = makeIndexable($2,$1,$3);	}
		| Op b_expr
				{	$$ = makeA_Expr(OP, $1, NULL, $2); }
		| b_expr Op
				{	$$ = makeA_Expr(OP, $2, $1, NULL); }
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		| func_name '(' ')'
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				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
					$$ = (Node *)n;
				}
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		| func_name '(' expr_list ')'
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				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					$$ = (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;
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					t->typmod = -1;
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					$$ = (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;
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					t->typmod = -1;
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					$$ = (Node *)n;
				}
		| CURRENT_TIME '(' Iconst ')'
				{
					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;
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					t->typmod = -1;
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					if ($3 != 0)
						elog(NOTICE,"CURRENT_TIME(%d) precision not implemented; zero used instead",$3);

					$$ = (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;
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					t->typmod = -1;
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					$$ = (Node *)n;
				}
		| CURRENT_TIMESTAMP '(' Iconst ')'
				{
					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;
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					t->typmod = -1;
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					if ($3 != 0)
						elog(NOTICE,"CURRENT_TIMESTAMP(%d) precision not implemented; zero used instead",$3);

					$$ = (Node *)n;
				}
		| CURRENT_USER
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "getpgusername";
					n->args = NIL;
					$$ = (Node *)n;
				}
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		| USER
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "getpgusername";
					n->args = NIL;
					$$ = (Node *)n;
				}
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		| POSITION '(' position_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "strpos";
					n->args = $3;
					$$ = (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;
				}
		;

4390
opt_indirection:  '[' a_expr ']' opt_indirection
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				{
					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);
				}
4404
		| /*EMPTY*/
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				{	$$ = NIL; }
		;
4407

4408
expr_list:  a_expr_or_null
4409
				{ $$ = lcons($1, NIL); }
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		| expr_list ',' a_expr_or_null
4411
				{ $$ = lappend($1, $3); }
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		| expr_list USING a_expr
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				{ $$ = lappend($1, $3); }
		;
4415

4416
extract_list:  extract_arg FROM a_expr
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				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = $1;
					$$ = lappend(lcons((Node *)n,NIL), $3);
				}
4423
		| /*EMPTY*/
4424 4425
				{	$$ = NIL; }
		;
4426

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extract_arg:  datetime						{ $$ = $1; }
		| TIMEZONE_HOUR						{ $$ = "tz_hour"; }
		| TIMEZONE_MINUTE					{ $$ = "tz_minute"; }
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		;

4432
position_list:  position_expr IN position_expr
4433
				{	$$ = makeList($3, $1, -1); }
4434
		| /*EMPTY*/
4435 4436
				{	$$ = NIL; }
		;
4437

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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); }
4457
		| position_expr TYPECAST Typename
4458
				{
4459
					$$ = (Node *)$1;
4460
					/* AexprConst can be either A_Const or ParamNo */
4461
					if (nodeTag($1) == T_A_Const) {
4462
						((A_Const *)$1)->typename = $3;
4463
					} else if (nodeTag($1) == T_Param) {
4464
						((ParamNo *)$1)->typename = $3;
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					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
						n->funcname = $3->name;
						n->args = lcons($1,NIL);
						$$ = (Node *)n;
					}
4472
				}
4473
		| CAST '(' position_expr AS Typename ')'
4474
				{
4475
					$$ = (Node *)$3;
4476
					/* AexprConst can be either A_Const or ParamNo */
4477 4478 4479 4480
					if (nodeTag($3) == T_A_Const) {
						((A_Const *)$3)->typename = $5;
					} else if (nodeTag($3) == T_Param) {
						((ParamNo *)$3)->typename = $5;
4481 4482 4483
					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
4484 4485
						n->funcname = $5->name;
						n->args = lcons($3,NIL);
4486 4487
						$$ = (Node *)n;
					}
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				}
		| '(' 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); }
4497
		| ColId
4498 4499 4500 4501 4502 4503 4504
				{
					/* could be a column name or a relation_name */
					Ident *n = makeNode(Ident);
					n->name = $1;
					n->indirection = NULL;
					$$ = (Node *)n;
				}
4505
		| func_name '(' ')'
4506 4507 4508 4509 4510 4511
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
					$$ = (Node *)n;
				}
4512
		| func_name '(' expr_list ')'
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				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					$$ = (Node *)n;
				}
4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563
		| POSITION '(' position_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "strpos";
					n->args = $3;
					$$ = (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;
				}
		;

4564
substr_list:  expr_list substr_from substr_for
4565
				{
4566
					$$ = nconc(nconc($1,$2),$3);
4567
				}
4568
		| /*EMPTY*/
4569 4570
				{	$$ = NIL; }
		;
4571

4572
substr_from:  FROM expr_list
4573
				{	$$ = $2; }
4574
		| /*EMPTY*/
4575 4576 4577 4578 4579 4580
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Integer;
					n->val.val.ival = 1;
					$$ = lcons((Node *)n,NIL);
				}
4581
		;
4582

4583
substr_for:  FOR expr_list
4584
				{	$$ = $2; }
4585
		| /*EMPTY*/
4586 4587
				{	$$ = NIL; }
		;
4588

4589
trim_list:  a_expr FROM expr_list
4590
				{ $$ = lappend($3, $1); }
4591
		| FROM expr_list
4592
				{ $$ = $2; }
4593
		| expr_list
4594 4595
				{ $$ = $1; }
		;
4596

4597 4598
in_expr:  SubSelect
				{
4599 4600 4601
					SubLink *n = makeNode(SubLink);
					n->subselect = $1;
					$$ = (Node *)n;
4602 4603 4604 4605 4606
				}
		| in_expr_nodes
				{	$$ = $1; }
		;

4607
in_expr_nodes:  AexprConst
4608
				{	$$ = makeA_Expr(OP, "=", lfirst(saved_In_Expr), $1); }
4609
		| in_expr_nodes ',' AexprConst
4610
				{	$$ = makeA_Expr(OR, NULL, $1,
4611
						makeA_Expr(OP, "=", lfirst(saved_In_Expr), $3));
4612 4613
				}
		;
4614

4615 4616
not_in_expr:  SubSelect
				{
4617 4618 4619
					SubLink *n = makeNode(SubLink);
					n->subselect = $1;
					$$ = (Node *)n;
4620 4621 4622 4623 4624
				}
		| not_in_expr_nodes
				{	$$ = $1; }
		;

4625
not_in_expr_nodes:  AexprConst
4626
				{	$$ = makeA_Expr(OP, "<>", lfirst(saved_In_Expr), $1); }
4627
		| not_in_expr_nodes ',' AexprConst
4628
				{	$$ = makeA_Expr(AND, NULL, $1,
4629
						makeA_Expr(OP, "<>", lfirst(saved_In_Expr), $3));
4630 4631
				}
		;
4632

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/* Case clause
 * Define SQL92-style case clause.
 * Allow all four forms described in the standard:
 * - Full specification
 *  CASE WHEN a = b THEN c ... ELSE d END
 * - Implicit argument
 *  CASE a WHEN b THEN c ... ELSE d END
 * - Conditional NULL
 *  NULLIF(x,y)
 *  same as CASE WHEN x = y THEN NULL ELSE x END
 * - Conditional substitution from list, use first non-null argument
 *  COALESCE(a,b,...)
 * same as CASE WHEN a IS NOT NULL THEN a WHEN b IS NOT NULL THEN b ... END
 * - thomas 1998-11-09
 */
case_expr:  CASE case_arg when_clause_list case_default END_TRANS
				{
					CaseExpr *c = makeNode(CaseExpr);
					c->arg = $2;
					c->args = $3;
					c->defresult = $4;
					$$ = (Node *)c;
				}
		| NULLIF '(' a_expr ',' a_expr ')'
				{
					CaseExpr *c = makeNode(CaseExpr);
					CaseWhen *w = makeNode(CaseWhen);
					c->args = lcons(w, NIL);
					c->defresult = $3;
					w->expr = makeA_Expr(OP, "=", $3, $5);
					$$ = (Node *)c;

					elog(NOTICE,"NULLIF() not yet fully implemented");
				}
		| COALESCE '(' expr_list ')'
				{
					CaseExpr *c = makeNode(CaseExpr);
					CaseWhen *w;
					List *l;
					foreach (l,$3)
					{
						w = makeNode(CaseWhen);
						w->expr = makeA_Expr(NOTNULL, NULL, lfirst(l), NULL);
						w->result = lfirst(l);
						c->args = lappend(c->args, w);
					}
					$$ = (Node *)c;

					elog(NOTICE,"COALESCE() not yet fully implemented");
				}
		;

when_clause_list:  when_clause_list when_clause
				{ $$ = lappend($1, $2); }
		| when_clause
				{ $$ = lcons($1, NIL); }
		;

when_clause:  WHEN a_expr THEN a_expr_or_null
				{
					CaseWhen *w = makeNode(CaseWhen);
					w->expr = $2;
					w->result = $4;
					$$ = (Node *)w;
				}
		;

case_default:  ELSE a_expr_or_null				{ $$ = $2; }
		| /*EMPTY*/								{ $$ = NULL; }
		;

case_arg:  attr opt_indirection
				{
					$1->indirection = $2;
					$$ = (Node *)$1;
				}
		| ColId
				{
					/* could be a column name or a relation_name */
					Ident *n = makeNode(Ident);
					n->name = $1;
					n->indirection = NULL;
					$$ = (Node *)n;
				}
		| /*EMPTY*/
				{	$$ = NULL; }
		;

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attr:  relation_name '.' attrs
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				{
					$$ = makeNode(Attr);
					$$->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("*")); }
		;

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/*****************************************************************************
 *
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 *	target lists
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 *
 *****************************************************************************/

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res_target_list:  res_target_list ',' res_target_el
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				{	$$ = lappend($1,$3);  }
		| res_target_el
				{	$$ = 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;
					$$ = lcons(rt, NIL);
				}
		;
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res_target_el:  ColId opt_indirection '=' a_expr_or_null
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				{
					$$ = 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;
					$$->val = (Node *)att;
				}
		;
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/*
** target list for select.
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** should get rid of the other but is still needed by the defunct select into
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** and update (uses a subset)
*/
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res_target_list2:  res_target_list2 ',' res_target_el2
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				{	$$ = lappend($1, $3);  }
		| res_target_el2
				{	$$ = lcons($1, NIL);  }
		;
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/* AS is not optional because shift/red conflict with unary ops */
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res_target_el2:  a_expr_or_null AS ColLabel
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				{
					$$ = 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;
				}
		;

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

relation_name:	SpecialRuleRelation
				{
					$$ = $1;
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					StrNCpy(saved_relname, $1, NAMEDATALEN);
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				}
		| ColId
				{
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					/* disallow refs to variable system tables */
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					if (strcmp(LogRelationName, $1) == 0
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					   || strcmp(VariableRelationName, $1) == 0)
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						elog(ERROR,"%s cannot be accessed by users",$1);
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					else
						$$ = $1;
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					StrNCpy(saved_relname, $1, NAMEDATALEN);
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				}
		;

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database_name:			ColId			{ $$ = $1; };
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access_method:			IDENT			{ $$ = $1; };
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attr_name:				ColId			{ $$ = $1; };
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class:					IDENT			{ $$ = $1; };
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index_name:				ColId			{ $$ = $1; };
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/* Functions
 * Include date/time keywords as SQL92 extension.
 * Include TYPE as a SQL92 unreserved keyword. - thomas 1997-10-05
 */
name:					ColId			{ $$ = $1; };
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func_name:				ColId			{ $$ = xlateSqlFunc($1); };
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file_name:				Sconst			{ $$ = $1; };
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recipe_name:			IDENT			{ $$ = $1; };
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/* Constants
 * Include TRUE/FALSE for SQL3 support. - thomas 1997-10-24
 */
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AexprConst:  Iconst
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				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Integer;
					n->val.val.ival = $1;
					$$ = (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;
				}
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		| Typename Sconst
				{
					A_Const *n = makeNode(A_Const);
					n->typename = $1;
					n->val.type = T_String;
					n->val.val.str = $2;
					$$ = (Node *)n;
				}
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		| ParamNo
				{	$$ = (Node *)$1;  }
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		| TRUE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "t";
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					n->typename = makeNode(TypeName);
					n->typename->name = xlateSqlType("bool");
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					n->typename->typmod = -1;
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					$$ = (Node *)n;
				}
		| FALSE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "f";
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					n->typename = makeNode(TypeName);
					n->typename->name = xlateSqlType("bool");
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					n->typename->typmod = -1;
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					$$ = (Node *)n;
				}
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		;
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ParamNo:  PARAM opt_indirection
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				{
					$$ = makeNode(ParamNo);
					$$->number = $1;
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					$$->indirection = $2;
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				}
		;
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Iconst:  ICONST							{ $$ = $1; };
Sconst:  SCONST							{ $$ = $1; };
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UserId:  IDENT							{ $$ = $1; };
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/* 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
 */
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TypeId:  ColId
			{	$$ = xlateSqlType($1); }
		| numeric
			{	$$ = xlateSqlType($1); }
		| character
			{	$$ = xlateSqlType($1); }
		;
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/* Column identifier
 * Include date/time keywords as SQL92 extension.
 * Include TYPE as a SQL92 unreserved keyword. - thomas 1997-10-05
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 * Add other keywords. Note that as the syntax expands,
 *  some of these keywords will have to be removed from this
 *  list due to shift/reduce conflicts in yacc. If so, move
 *  down to the ColLabel entity. - thomas 1997-11-06
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 */
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ColId:  IDENT							{ $$ = $1; }
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		| datetime						{ $$ = $1; }
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		| ABSOLUTE						{ $$ = "absolute"; }
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		| ACTION						{ $$ = "action"; }
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		| AFTER							{ $$ = "after"; }
		| AGGREGATE						{ $$ = "aggregate"; }
		| BACKWARD						{ $$ = "backward"; }
		| BEFORE						{ $$ = "before"; }
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		| CACHE							{ $$ = "cache"; }
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		| CREATEDB						{ $$ = "createdb"; }
		| CREATEUSER					{ $$ = "createuser"; }
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		| CYCLE							{ $$ = "cycle"; }
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		| DATABASE						{ $$ = "database"; }
		| DELIMITERS					{ $$ = "delimiters"; }
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		| DOUBLE						{ $$ = "double"; }
		| EACH							{ $$ = "each"; }
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		| ENCODING						{ $$ = "encoding"; }
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		| FORWARD						{ $$ = "forward"; }
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		| FUNCTION						{ $$ = "function"; }
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		| HANDLER						{ $$ = "handler"; }
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		| INCREMENT						{ $$ = "increment"; }
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		| INDEX							{ $$ = "index"; }
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		| INHERITS						{ $$ = "inherits"; }
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		| INSENSITIVE					{ $$ = "insensitive"; }
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		| INSTEAD						{ $$ = "instead"; }
		| ISNULL						{ $$ = "isnull"; }
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		| KEY							{ $$ = "key"; }
		| LANGUAGE						{ $$ = "language"; }
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		| LANCOMPILER					{ $$ = "lancompiler"; }
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		| LOCATION						{ $$ = "location"; }
		| MATCH							{ $$ = "match"; }
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		| MAXVALUE						{ $$ = "maxvalue"; }
		| MINVALUE						{ $$ = "minvalue"; }
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		| NEXT							{ $$ = "next"; }
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		| NOCREATEDB					{ $$ = "nocreatedb"; }
		| NOCREATEUSER					{ $$ = "nocreateuser"; }
		| NOTHING						{ $$ = "nothing"; }
		| NOTNULL						{ $$ = "notnull"; }
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		| OF							{ $$ = "of"; }
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		| OIDS							{ $$ = "oids"; }
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		| ONLY							{ $$ = "only"; }
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		| OPERATOR						{ $$ = "operator"; }
		| OPTION						{ $$ = "option"; }
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		| PASSWORD						{ $$ = "password"; }
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		| PRIOR							{ $$ = "prior"; }
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		| PRIVILEGES					{ $$ = "privileges"; }
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		| PROCEDURAL					{ $$ = "procedural"; }
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		| READ							{ $$ = "read"; }
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		| RECIPE						{ $$ = "recipe"; }
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		| RELATIVE						{ $$ = "relative"; }
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		| RENAME						{ $$ = "rename"; }
		| RETURNS						{ $$ = "returns"; }
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		| ROW							{ $$ = "row"; }
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		| RULE							{ $$ = "rule"; }
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		| SCROLL						{ $$ = "scroll"; }
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		| SEQUENCE						{ $$ = "sequence"; }
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		| SERIAL						{ $$ = "serial"; }
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		| START							{ $$ = "start"; }
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		| STATEMENT						{ $$ = "statement"; }
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		| STDIN							{ $$ = "stdin"; }
		| STDOUT						{ $$ = "stdout"; }
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		| TIME							{ $$ = "time"; }
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		| TIMESTAMP						{ $$ = "timestamp"; }
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		| TIMEZONE_HOUR					{ $$ = "timezone_hour"; }
		| TIMEZONE_MINUTE				{ $$ = "timezone_minute"; }
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		| TRIGGER						{ $$ = "trigger"; }
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		| TRUSTED						{ $$ = "trusted"; }
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		| TYPE_P						{ $$ = "type"; }
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		| VALID							{ $$ = "valid"; }
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		| VERSION						{ $$ = "version"; }
		| ZONE							{ $$ = "zone"; }
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		;

/* 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
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 * 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
5060 5061
 */
ColLabel:  ColId						{ $$ = $1; }
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		| ABORT_TRANS					{ $$ = "abort"; }
		| ANALYZE						{ $$ = "analyze"; }
		| BINARY						{ $$ = "binary"; }
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		| CASE							{ $$ = "case"; }
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		| CLUSTER						{ $$ = "cluster"; }
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		| COALESCE						{ $$ = "coalesce"; }
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		| CONSTRAINT					{ $$ = "constraint"; }
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		| COPY							{ $$ = "copy"; }
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		| CROSS							{ $$ = "cross"; }
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		| CURRENT						{ $$ = "current"; }
		| DO							{ $$ = "do"; }
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		| ELSE							{ $$ = "else"; }
		| END_TRANS						{ $$ = "end"; }
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		| EXPLAIN						{ $$ = "explain"; }
		| EXTEND						{ $$ = "extend"; }
		| FALSE_P						{ $$ = "false"; }
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		| FOREIGN						{ $$ = "foreign"; }
		| GROUP							{ $$ = "group"; }
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		| LISTEN						{ $$ = "listen"; }
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		| LOAD							{ $$ = "load"; }
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		| LOCK_P						{ $$ = "lock"; }
		| MOVE							{ $$ = "move"; }
		| NEW							{ $$ = "new"; }
		| NONE							{ $$ = "none"; }
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		| NULLIF						{ $$ = "nullif"; }
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		| ORDER							{ $$ = "order"; }
		| POSITION						{ $$ = "position"; }
		| PRECISION						{ $$ = "precision"; }
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		| RESET							{ $$ = "reset"; }
		| SETOF							{ $$ = "setof"; }
		| SHOW							{ $$ = "show"; }
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		| TABLE							{ $$ = "table"; }
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		| THEN							{ $$ = "then"; }
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		| TRANSACTION					{ $$ = "transaction"; }
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		| TRUE_P						{ $$ = "true"; }
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		| VACUUM						{ $$ = "vacuum"; }
		| VERBOSE						{ $$ = "verbose"; }
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		| WHEN							{ $$ = "when"; }
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		;
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SpecialRuleRelation:  CURRENT
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				{
					if (QueryIsRule)
						$$ = "*CURRENT*";
					else
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						elog(ERROR,"CURRENT used in non-rule query");
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				}
		| NEW
				{
					if (QueryIsRule)
						$$ = "*NEW*";
					else
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						elog(ERROR,"NEW used in non-rule query");
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				}
		;
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%%

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static Node *
makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr)
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{
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	A_Expr *a = makeNode(A_Expr);
	a->oper = oper;
	a->opname = opname;
	a->lexpr = lexpr;
	a->rexpr = rexpr;
	return (Node *)a;
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}

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/* makeRowExpr()
 * Generate separate operator nodes for a single row descriptor expression.
 * Perhaps this should go deeper in the parser someday... - thomas 1997-12-22
 */
static Node *
makeRowExpr(char *opr, List *largs, List *rargs)
{
	Node *expr = NULL;
	Node *larg, *rarg;

	if (length(largs) != length(rargs))
		elog(ERROR,"Unequal number of entries in row expression");

	if (lnext(largs) != NIL)
		expr = makeRowExpr(opr,lnext(largs),lnext(rargs));

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

	if ((strcmp(opr, "=") == 0)
	 || (strcmp(opr, "<") == 0)
	 || (strcmp(opr, "<=") == 0)
	 || (strcmp(opr, ">") == 0)
	 || (strcmp(opr, ">=") == 0))
	{
		if (expr == NULL)
			expr = makeA_Expr(OP, opr, larg, rarg);
		else
			expr = makeA_Expr(AND, NULL, expr, makeA_Expr(OP, opr, larg, rarg));
	}
	else if (strcmp(opr, "<>") == 0)
	{
		if (expr == NULL)
			expr = makeA_Expr(OP, opr, larg, rarg);
		else
			expr = makeA_Expr(OR, NULL, expr, makeA_Expr(OP, opr, larg, rarg));
	}
	else
	{
		elog(ERROR,"Operator '%s' not implemented for row expressions",opr);
	}

#if FALSE
	while ((largs != NIL) && (rargs != NIL))
	{
		larg = lfirst(largs);
		rarg = lfirst(rargs);

		if (expr == NULL)
			expr = makeA_Expr(OP, opr, larg, rarg);
		else
			expr = makeA_Expr(AND, NULL, expr, makeA_Expr(OP, opr, larg, rarg));

		largs = lnext(largs);
		rargs = lnext(rargs);
	}
	pprint(expr);
#endif

	return expr;
}

5193
static void
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mapTargetColumns(List *src, List *dst)
{
	ColumnDef *s;
	ResTarget *d;

	if (length(src) != length(dst))
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		elog(ERROR,"CREATE TABLE/AS SELECT has mismatched column count");
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	while ((src != NIL) && (dst != NIL))
	{
		s = (ColumnDef *)lfirst(src);
		d = (ResTarget *)lfirst(dst);

		d->name = s->colname;

		src = lnext(src);
		dst = lnext(dst);
	}

	return;
} /* mapTargetColumns() */
5215

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static Node *makeIndexable(char *opname, Node *lexpr, Node *rexpr)
{
	Node *result = NULL;

	/* we do this so indexes can be used */
5221 5222
	if (strcmp(opname,"~") == 0 ||
		strcmp(opname,"~*") == 0)
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	{
		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] == '[' ||
5240
					n->val.val.str[pos] == '$' ||
5241
					(strcmp(opname,"~*") == 0 && isalpha(n->val.val.str[pos])))
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		     		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++)
			{
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				if (n->val.val.str[pos] == '%' &&
					 n->val.val.str[pos+1] != '%')
					break;
				if(n->val.val.str[pos] == '_')
			     		break;
			     	if (n->val.val.str[pos] == '\\' ||
				     	n->val.val.str[pos] == '%')
5289
					pos++;
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				if (n->val.val.str[pos] == '\0')
					break;
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				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;
5321
} /* makeIndexable() */
5322 5323


5324
/* xlateSqlFunc()
5325
 * Convert alternate type names to internal Postgres types.
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 * Do not convert "float", since that is handled elsewhere
 *  for FLOAT(p) syntax.
5328
 */
5329
static char *
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xlateSqlFunc(char *name)
{
	if (!strcasecmp(name,"character_length")
	 || !strcasecmp(name,"char_length"))
		return "length";
	else
		return name;
} /* xlateSqlFunc() */

/* xlateSqlType()
 * Convert alternate type names to internal Postgres types.
 */
static char *
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xlateSqlType(char *name)
{
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	if (!strcasecmp(name,"int")
	 || !strcasecmp(name,"integer"))
5347
		return "int4";
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	else if (!strcasecmp(name, "smallint"))
		return "int2";
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	else if (!strcasecmp(name, "real")
	 || !strcasecmp(name, "float"))
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		return "float8";
	else if (!strcasecmp(name, "interval"))
		return "timespan";
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	else if (!strcasecmp(name, "boolean"))
		return "bool";
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	else
		return name;
5359
} /* xlateSqlType() */
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5361

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void parser_init(Oid *typev, int nargs)
{
5364
	QueryIsRule = FALSE;
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	saved_relname[0]= '\0';
	saved_In_Expr = NULL;
5367

5368
	param_type_init(typev, nargs);
5369
}
5370

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/* FlattenStringList()
 * Traverse list of string nodes and convert to a single string.
 * Used for reconstructing string form of complex expressions.
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 *
 * Allocate at least one byte for terminator.
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 */
static char *
FlattenStringList(List *list)
{
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	List *l;
	Value *v;
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	char *s;
	char *sp;
5385
	int nlist, len = 0;
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	nlist = length(list);
	l = list;
	while(l != NIL) {
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		v = (Value *)lfirst(l);
		sp = v->val.str;
5392
		l = lnext(l);
5393
		len += strlen(sp);
5394
	};
5395
	len += nlist;
5396

5397
	s = (char*) palloc(len+1);
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	*s = '\0';

	l = list;
	while(l != NIL) {
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		v = (Value *)lfirst(l);
		sp = v->val.str;
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		l = lnext(l);
		strcat(s,sp);
5406
		if (l != NIL) strcat(s," ");
5407
	};
5408
	*(s+len) = '\0';
5409

5410
	return s;
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} /* FlattenStringList() */

5413

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/* makeConstantList()
 * Convert constant value node into string node.
 */
static List *
makeConstantList( A_Const *n)
{
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	List *result = NIL;
	char *typval = NULL;
5422
	char *defval = NULL;
5423

5424
	if (nodeTag(n) != T_A_Const) {
Bruce Momjian's avatar
Bruce Momjian committed
5425
		elog(ERROR,"Cannot handle non-constant parameter");
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	} else if (n->val.type == T_Float) {
		defval = (char*) palloc(20+1);
		sprintf( defval, "%g", n->val.val.dval);
5430
		result = lcons( makeString(defval), NIL);
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	} else if (n->val.type == T_Integer) {
		defval = (char*) palloc(20+1);
		sprintf( defval, "%ld", n->val.val.ival);
5435
		result = lcons( makeString(defval), NIL);
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	} 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, "'");
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		if (n->typename != NULL)
		{
			typval = (char*) palloc(strlen( n->typename->name) + 1);
			strcpy(typval, n->typename->name);
			result = lappend( lcons( makeString(typval), NIL), makeString(defval));
		}
		else
		{
			result = lcons( makeString(defval), NIL);
		}
5452 5453

	} else {
Bruce Momjian's avatar
Bruce Momjian committed
5454
		elog(ERROR,"Internal error in makeConstantList(): cannot encode node");
5455 5456
	};

5457
	return result;
5458
} /* makeConstantList() */
5459

5460

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/* 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') {
5474
		cp = palloc(strlen(rawid)+3);
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		strcpy(cp,"\"");
		strcat(cp,rawid);
		strcat(cp,"\"");
	} else {
		cp = rawid;
	};

5482
	return cp;
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}

/*
 * 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];
}