postgresql/src/backend/parser/gram.y

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

/*#define YYDEBUG 1*/
/*-------------------------------------------------------------------------
 *
 * gram.y--
 *	  POSTGRES SQL YACC rules/actions
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.59 1997/10/28 14:56:08 vadim Exp $
 *
 * HISTORY
 *	  AUTHOR			DATE			MAJOR EVENT
 *	  Andrew Yu			Sept, 1994		POSTQUEL to SQL conversion
 *	  Andrew Yu			Oct, 1994		lispy code conversion
 *
 * NOTES
 *	  CAPITALS are used to represent terminal symbols.
 *	  non-capitals are used to represent non-terminals.
 *	  SQL92-specific syntax is separated from plain SQL/Postgres syntax
 *	  to help isolate the non-extensible portions of the parser.
 *
 *	  if you use list, make sure the datum is a node so that the printing
 *	  routines work
 *
 * WARNING
 *	  sometimes we assign constants to makeStrings. Make sure we don't free
 *	  those.
 *
 *-------------------------------------------------------------------------
 */
#include <string.h>
#include <ctype.h>

#include "postgres.h"
#include "nodes/parsenodes.h"
#include "nodes/print.h"
#include "parser/gramparse.h"
#include "parser/catalog_utils.h"
#include "parser/parse_query.h"
#include "storage/smgr.h"
#include "utils/acl.h"
#include "catalog/catname.h"
#include "utils/elog.h"
#include "access/xact.h"

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

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

static char *xlateSqlType(char *);
static Node *makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr);
static List *makeConstantList( A_Const *node);
static char *FlattenStringList(List *list);

/* old versions of flex define this as a macro */
#if defined(yywrap)
#undef yywrap
#endif /* yywrap */
%}


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

	Attr				*attr;

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

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

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

%type <node>	SubSelect
%type <str>		join_expr, join_outer, join_spec
%type <boolean> TriggerActionTime, TriggerForSpec, PLangTrusted

%type <str>		TriggerEvents, TriggerFuncArg

%type <str>		relation_name, copy_file_name, copy_delimiter, def_name,
		database_name, access_method_clause, access_method, attr_name,
		class, index_name, name, file_name, recipe_name, aggr_argtype

%type <str>		opt_id, opt_portal_name,
		before_clause, after_clause, all_Op, MathOp, opt_name, opt_unique,
		result, OptUseOp, opt_class, opt_range_start, opt_range_end,
		SpecialRuleRelation

%type <str>		privileges, operation_commalist, grantee
%type <chr>		operation, TriggerOneEvent

%type <list>	stmtblock, stmtmulti,
		relation_name_list, OptTableElementList, tableElementList,
		OptInherit, OptConstraint, ConstraintList, definition,
		opt_with, def_args, def_name_list, func_argtypes,
		oper_argtypes, OptStmtList, OptStmtBlock, OptStmtMulti,
		opt_column_list, columnList, opt_va_list, va_list,
		sort_clause, sortby_list, index_params, index_list, name_list,
		from_clause, from_list, opt_array_bounds, nest_array_bounds,
		expr_list, attrs, res_target_list, res_target_list2,
		def_list, opt_indirection, group_clause, groupby_list, TriggerFuncArgs

%type <list>	union_clause, select_list
%type <list>	join_list
%type <sortgroupby>		join_using

%type <node>	position_expr
%type <list>	extract_list, position_list
%type <list>	substr_list, substr_from, substr_for, trim_list
%type <list>	opt_interval

%type <boolean> opt_inh_star, opt_binary, opt_instead, opt_with_copy,
				index_opt_unique, opt_verbose, opt_analyze

%type <ival>	copy_dirn, archive_type, OptArchiveType, OptArchiveLocation,
		def_type, opt_direction, remove_type, opt_column, event

%type <ival>	OptLocation, fetch_how_many

%type <list>	OptSeqList
%type <defelt>	OptSeqElem

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

%type <coldef>	columnDef, alter_clause
%type <defelt>	def_elem
%type <node>	def_arg, columnElem, where_clause,
				a_expr, a_expr_or_null, AexprConst,
				in_expr, in_expr_nodes, not_in_expr, not_in_expr_nodes,
				having_clause
%type <value>	NumConst
%type <attr>	event_object, attr
%type <sortgroupby>		groupby
%type <sortgroupby>		sortby
%type <ielem>	index_elem, func_index
%type <range>	from_val
%type <relexp>	relation_expr
%type <trange>	time_range
%type <target>	res_target_el, res_target_el2
%type <paramno> ParamNo

%type <typnam>	Typename, opt_type, Array, Generic, Character, Datetime, Numeric
%type <str>		generic, character, datetime
%type <str>		opt_charset, opt_collate
%type <str>		opt_float, opt_numeric, opt_decimal
%type <boolean>	opt_varying, opt_timezone

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

%type <constrdef>	ConstraintElem, ConstraintDef

%type <list>	constraint_elem
%type <list>	default_expr
%type <str>		opt_default
%type <boolean>	opt_constraint
%type <list>	key_actions, key_action
%type <str>		key_match, key_reference

/*
 * If you make any token changes, remember to:
 *		- use "yacc -d" and update parse.h
 *		- update the keyword table in parser/keywords.c
 */

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

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

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

/* Keywords for Postgres support (not in SQL92 reserved words) */
%token	ABORT_TRANS, ACL, AFTER, AGGREGATE, ANALYZE,
		APPEND, ARCHIVE, ARCH_STORE,
		BACKWARD, BEFORE, BINARY, CHANGE, CLUSTER, COPY,
		DATABASE, DELIMITERS, DO, EXPLAIN, EXTEND,
		FORWARD, FUNCTION, HANDLER, HEAVY,
		INDEX, INHERITS, INSTEAD, ISNULL,
		LANCOMPILER, LIGHT, LISTEN, LOAD, MERGE, MOVE,
		NEW, NONE, NOTHING, OIDS, OPERATOR, PROCEDURAL, PURGE,
		RECIPE, RENAME, REPLACE, RESET, RETRIEVE, RETURNS, RULE,
		SEQUENCE, SETOF, SHOW, STDIN, STDOUT, STORE, TRUSTED, 
		VACUUM, VERBOSE, VERSION

/* Special keywords, not in the query language - see the "lex" file */
%token <str>	IDENT, SCONST, Op
%token <ival>	ICONST, PARAM
%token <dval>	FCONST

/* these are not real. they are here so that they get generated as #define's*/
%token			OP

/* precedence */
%left		OR
%left		AND
%right		NOT
%right		'='
%nonassoc	LIKE
%nonassoc	BETWEEN
%nonassoc	IN
%nonassoc	Op
%nonassoc	NOTNULL
%nonassoc	ISNULL
%nonassoc	IS
%left		'+' '-'
%left		'*' '/'
%left		'|'				/* this is the relation union op, not logical or */
/* Unary Operators */
%right		':'
%left		';'				/* end of statement or natural log */
%nonassoc	'<' '>'
%right		UMINUS
%left		'.'
%left		'[' ']'
%nonassoc	TYPECAST
%nonassoc	REDUCE
%left		UNION
%%

stmtblock: stmtmulti
				{ parsetree = $1; }
		|  stmt
				{ parsetree = lcons($1,NIL); }
		;

stmtmulti: stmtmulti stmt ';'
				{ $$ = lappend($1, $2); }
		|  stmtmulti stmt
				{ $$ = lappend($1, $2); }
		|  stmt ';'
				{ $$ = lcons($1,NIL); }
		;

stmt :	  AddAttrStmt
		| ClosePortalStmt
		| CopyStmt
		| CreateStmt
		| CreateSeqStmt
		| CreatePLangStmt
		| CreateTrigStmt
		| ClusterStmt
		| DefineStmt
		| DestroyStmt
		| DropPLangStmt
		| DropTrigStmt
		| ExtendStmt
		| ExplainStmt
		| FetchStmt
		| GrantStmt
		| IndexStmt
		| ListenStmt
		| ProcedureStmt
		| PurgeStmt
		| RecipeStmt
		| RemoveAggrStmt
		| RemoveOperStmt
		| RemoveFuncStmt
		| RemoveStmt
		| RenameStmt
		| RevokeStmt
		| OptimizableStmt
		| RuleStmt
		| TransactionStmt
		| ViewStmt
		| LoadStmt
		| CreatedbStmt
		| DestroydbStmt
		| VacuumStmt
		| VariableSetStmt
		| VariableShowStmt
		| VariableResetStmt
		;


/*****************************************************************************
 *
 * Set PG internal variable
 *	  SET name TO 'var_value'
 * Include SQL92 syntax (thomas 1997-10-22):
 *    SET TIME ZONE 'var_value'
 *
 *****************************************************************************/

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

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

zone_value:  Sconst			{ $$ = $1; }
		| LOCAL				{ $$ = "default"; }
		;

VariableShowStmt:  SHOW ColId
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name  = $2;
					$$ = (Node *) n;
				}
		;

VariableResetStmt:	RESET ColId
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name  = $2;
					$$ = (Node *) n;
				}
		;


/*****************************************************************************
 *
 *		QUERY :
 *				addattr ( attr1 = type1 .. attrn = typen ) to <relname> [*]
 *
 *****************************************************************************/

AddAttrStmt:  ALTER TABLE relation_name opt_inh_star alter_clause
				{
					AddAttrStmt *n = makeNode(AddAttrStmt);
					n->relname = $3;
					n->inh = $4;
					n->colDef = $5;
					$$ = (Node *)n;
				}
		;

alter_clause:  ADD opt_column columnDef
				{
					$$ = $3;
				}
			| ADD '(' tableElementList ')'
				{
					ColumnDef *lp = lfirst($3);

					if (length($3) != 1)
						elog(WARN,"ALTER TABLE/ADD() allows one column only",NULL);
#ifdef PARSEDEBUG
printf( "list has %d elements\n", length($3));
#endif
					$$ = lp;
				}
			| DROP opt_column ColId
				{	elog(WARN,"ALTER TABLE/DROP COLUMN not yet implemented",NULL); }
			| ALTER opt_column ColId SET opt_default
				{	elog(WARN,"ALTER TABLE/ALTER COLUMN/SET DEFAULT not yet implemented",NULL); }
			| ALTER opt_column ColId DROP DEFAULT
				{	elog(WARN,"ALTER TABLE/ALTER COLUMN/DROP DEFAULT not yet implemented",NULL); }
			| ADD ConstraintElem
				{	elog(WARN,"ALTER TABLE/ADD CONSTRAINT not yet implemented",NULL); }
		;

columnDef:  ColId Typename opt_default opt_constraint
				{
					$$ = makeNode(ColumnDef);
					$$->colname = $1;
					$$->typename = $2;
					$$->defval = $3;
					$$->is_not_null = $4;
				}
		;

opt_default:  DEFAULT default_expr
				{
					$$ = FlattenStringList($2);
				}
			|  /*EMPTY*/		{ $$ = NULL; }
	;

default_expr:  AexprConst
				{	$$ = makeConstantList((A_Const *) $1); }
			| Pnull
				{	$$ = lcons( makeString("NULL"), NIL); }
			| '-' 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
				{	$$ = nconc( $1, lcons( makeString( "*"), $3)); }
			| default_expr '=' default_expr
				{	elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
			| default_expr '<' default_expr
				{	elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
			| default_expr '>' default_expr
				{	elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
			| ':' default_expr
				{	$$ = lcons( makeString( ":"), $2); }
			| ';' default_expr
				{	$$ = lcons( makeString( ";"), $2); }
			| '|' default_expr
				{	$$ = lcons( makeString( "|"), $2); }
			| default_expr TYPECAST Typename
				{
		   		 $$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
				}
			| CAST default_expr AS Typename
				{
		   		 $$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
				}
			| '(' default_expr ')'
				{	$$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
			| name '(' default_expr ')'
				{
					$$ = makeList( makeString($1), makeString("("), -1);
					$$ = nconc( $$, $3);
					$$ = lappend( $$, makeString(")"));
				}
			| name '(' ')'
				{
					$$ = makeList( makeString($1), makeString("("), -1);
					$$ = lappend( $$, makeString(")"));
				}
			| default_expr Op default_expr
				{
					if (!strcmp("<=", $2) || !strcmp(">=", $2))
						elog(WARN,"boolean expressions not supported in DEFAULT",NULL);
					$$ = 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(p) precision must be zero",NULL);
					$$ = lcons( makeString( "'now'::time"), NIL);
				}
			| CURRENT_TIMESTAMP
				{	$$ = lcons( makeString( "now()"), NIL); }
			| CURRENT_TIMESTAMP '(' Iconst ')'
				{
					if ($3 != 0)
						elog(NOTICE,"CURRENT_TIMESTAMP(p) precision must be zero",NULL);
					$$ = lcons( makeString( "now()"), NIL);
				}
			| CURRENT_USER
				{	$$ = lcons( makeString( "CURRENT_USER"), NIL); }
		;

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


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

ClosePortalStmt:  CLOSE opt_id
				{
					ClosePortalStmt *n = makeNode(ClosePortalStmt);
					n->portalname = $2;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 *		QUERY :
 *				COPY [BINARY] <relname> FROM/TO
 *				[USING DELIMITERS <delimiter>]
 *
 *****************************************************************************/

CopyStmt:  COPY opt_binary relation_name opt_with_copy copy_dirn copy_file_name copy_delimiter
				{
					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
				{ $$ = TO; }
		|  FROM
				{ $$ = FROM; }
		;

/*
 * 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
 * stdout. We silently correct the "typo".		 - AY 9/94
 */
copy_file_name:  Sconst							{ $$ = $1; }
		| STDIN									{ $$ = NULL; }
		| STDOUT								{ $$ = NULL; }
		;

opt_binary: BINARY								{ $$ = TRUE; }
		|  /*EMPTY*/							{ $$ = FALSE; }
		;

opt_with_copy:	WITH OIDS						{ $$ = TRUE; }
		|  /* EMPTY */							{ $$ = FALSE; }
		;

/*
 * the default copy delimiter is tab but the user can configure it
 */
copy_delimiter: USING DELIMITERS Sconst { $$ = $3;}
		| /* EMPTY */  { $$ = "\t"; }
		;


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

CreateStmt:  CREATE TABLE relation_name '(' OptTableElementList ')'
				OptInherit OptConstraint OptArchiveType OptLocation
				OptArchiveLocation
				{
					CreateStmt *n = makeNode(CreateStmt);
					n->relname = $3;
					n->tableElts = $5;
					n->inhRelnames = $7;
					n->constraints = $8;
					n->archiveType = $9;
					n->location = $10;
					n->archiveLoc = $11;
					$$ = (Node *)n;
				}
		;

OptTableElementList:  tableElementList			{ $$ = $1; }
		| /* EMPTY */							{ $$ = NULL; }
		;

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


OptArchiveType:  ARCHIVE '=' archive_type				{ $$ = $3; }
		| /*EMPTY*/										{ $$ = ARCH_NONE; }
		;

archive_type:  HEAVY									{ $$ = ARCH_HEAVY; }
		| LIGHT											{ $$ = ARCH_LIGHT; }
		| NONE											{ $$ = ARCH_NONE; }
		;

OptLocation:  STORE '=' Sconst
				{  $$ = smgrin($3);  }
		| /*EMPTY*/
				{  $$ = -1;  }
		;

OptArchiveLocation: ARCH_STORE '=' Sconst
				{  $$ = smgrin($3);  }
		| /*EMPTY*/
				{  $$ = -1;  }
		;

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

OptConstraint:	ConstraintList							{ $$ = $1; }
		| /*EMPTY*/										{ $$ = NULL; }
		;

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

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

ConstraintDef:	CHECK constraint_elem
				{
					ConstraintDef *constr = palloc (sizeof(ConstraintDef));
#ifdef PARSEDEBUG
printf("in ConstraintDef\n");
#endif
					constr->type = CONSTR_CHECK;
					constr->name = NULL;
					constr->def = FlattenStringList($2);
#ifdef PARSEDEBUG
printf("ConstraintDef: string is %s\n", (char *) constr->def);
#endif
					$$ = constr;
				}
		| UNIQUE '(' columnList ')'
				{	elog(WARN,"CREATE TABLE/UNIQUE not yet implemented",NULL); }
		| PRIMARY KEY '(' columnList ')'
				{	elog(WARN,"CREATE TABLE/PRIMARY KEY not yet implemented",NULL); }
		| FOREIGN KEY '(' columnList ')' REFERENCES ColId opt_column_list key_match key_actions
				{	elog(WARN,"CREATE TABLE/FOREIGN KEY not yet implemented",NULL); }
		;

constraint_elem:  AexprConst
				{	$$ = makeConstantList((A_Const *) $1); }
			| Pnull
				{	$$ = lcons( makeString("NULL"), NIL); }
			| ColId
				{
#ifdef PARSEDEBUG
printf( "ColId is %s\n", $1);
#endif
					$$ = lcons( makeString($1), NIL);
				}
			| '-' constraint_elem %prec UMINUS
				{	$$ = lcons( makeString( "-"), $2); }
			| constraint_elem '+' constraint_elem
				{	$$ = nconc( $1, lcons( makeString( "+"), $3)); }
			| constraint_elem '-' constraint_elem
				{	$$ = nconc( $1, lcons( makeString( "-"), $3)); }
			| constraint_elem '/' constraint_elem
				{	$$ = nconc( $1, lcons( makeString( "/"), $3)); }
			| constraint_elem '*' constraint_elem
				{	$$ = nconc( $1, lcons( makeString( "*"), $3)); }
			| constraint_elem '=' constraint_elem
				{	$$ = nconc( $1, lcons( makeString( "="), $3)); }
			| constraint_elem '<' constraint_elem
				{	$$ = nconc( $1, lcons( makeString( "<"), $3)); }
			| constraint_elem '>' constraint_elem
				{	$$ = nconc( $1, lcons( makeString( ">"), $3)); }
			| ':' constraint_elem
				{	$$ = lcons( makeString( ":"), $2); }
			| ';' constraint_elem
				{	$$ = lcons( makeString( ";"), $2); }
			| '|' constraint_elem
				{	$$ = lcons( makeString( "|"), $2); }
			| constraint_elem TYPECAST Typename
				{
		   		 $$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
				}
			| CAST constraint_elem AS Typename
				{
		   		 $$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
				}
			| '(' constraint_elem ')'
				{	$$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
			| name '(' constraint_elem ')'
				{
					$$ = makeList( makeString($1), makeString("("), -1);
					$$ = nconc( $$, $3);
					$$ = lappend( $$, makeString(")"));
				}
			| constraint_elem Op constraint_elem
				{	$$ = nconc( $1, lcons( makeString( $2), $3)); }
			| constraint_elem AND constraint_elem
				{	$$ = nconc( $1, lcons( makeString( "AND"), $3)); }
			| constraint_elem OR constraint_elem
				{	$$ = nconc( $1, lcons( makeString( "OR"), $3)); }
			| Op constraint_elem
				{	$$ = lcons( makeString( $1), $2); }
			| constraint_elem Op
				{	$$ = lappend( $1, makeString( $2)); }
		;

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; }
		;


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

CreateSeqStmt:	CREATE SEQUENCE relation_name OptSeqList
				{
					CreateSeqStmt *n = makeNode(CreateSeqStmt);
					n->seqname = $3;
					n->options = $4;
					$$ = (Node *)n;
				}
		;

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

OptSeqElem:		IDENT NumConst
				{
					$$ = makeNode(DefElem);
					$$->defname = $1;
					$$->arg = (Node *)$2;
				}
		|		IDENT
				{
					$$ = makeNode(DefElem);
					$$->defname = $1;
					$$->arg = (Node *)NULL;
				}
		;

/*****************************************************************************
 *
 *		QUERIES :
 *				CREATE PROCEDURAL LANGUAGE ...
 *				DROP PROCEDURAL LANGUAGE ...
 *
 *****************************************************************************/

CreatePLangStmt: CREATE PLangTrusted PROCEDURAL LANGUAGE Sconst 
			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; }

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

/*****************************************************************************
 *
 *		QUERIES :
 *				CREATE TRIGGER ...
 *				DROP TRIGGER ...
 *
 *****************************************************************************/

CreateTrigStmt: CREATE TRIGGER name TriggerActionTime TriggerEvents ON
				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;
				}
		;

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

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

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

TriggerForSpec: FOR name name
				{
						if ( strcmp ($2, "each") != 0 )
								elog(WARN,"parser: syntax error near %s",$2);
						if ( strcmp ($3, "row") == 0 )
								$$ = TRUE;
						else if ( strcmp ($3, "statement") == 0 )
								$$ = FALSE;
						else
								elog(WARN,"parser: syntax error near %s",$3);
				}
		;

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

TriggerFuncArg: ICONST
					{
						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; }
		;

DropTrigStmt:	DROP TRIGGER name ON relation_name
				{
					DropTrigStmt *n = makeNode(DropTrigStmt);
					n->trigname = $3;
					n->relname = $5;
					$$ = (Node *) n;
				}
		;


/*****************************************************************************
 *
 *		QUERY :
 *				define (type,operator,aggregate)
 *
 *****************************************************************************/

DefineStmt:  CREATE def_type def_rest
				{
					$3->defType = $2;
					$$ = (Node *)$3;
				}
		;

def_rest:  def_name definition
				{
					$$ = makeNode(DefineStmt);
					$$->defname = $1;
#ifdef PARSEDEBUG
printf("def_rest: defname is %s\n", $1);
#endif
					$$->definition = $2;
				}
		;

def_type:  OPERATOR							{ $$ = OPERATOR; }
		|  Type
				{
#ifdef PARSEDEBUG
printf("def_type: decoding TYPE_P\n");
#endif
					$$ = TYPE_P;
				}
		|  AGGREGATE						{ $$ = AGGREGATE; }
		;

def_name:  PROCEDURE						{ $$ = "procedure"; }
		|  ColId							{ $$ = $1; }
		|  MathOp							{ $$ = $1; }
		|  Op								{ $$ = $1; }
		;

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

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

def_elem:  def_name '=' def_arg
				{
#ifdef PARSEDEBUG
printf("def_elem: decoding %s =\n", $1);
pprint($3);
#endif
					$$ = makeNode(DefElem);
					$$->defname = $1;
					$$->arg = (Node *)$3;
				}
		|  def_name
				{
#ifdef PARSEDEBUG
printf("def_elem: decoding %s\n", $1);
#endif
					$$ = makeNode(DefElem);
					$$->defname = $1;
					$$->arg = (Node *)NULL;
				}
		|  DEFAULT '=' def_arg
				{
#ifdef PARSEDEBUG
printf("def_elem: decoding DEFAULT =\n");
pprint($3);
#endif
					$$ = makeNode(DefElem);
					$$->defname = "default";
					$$->arg = (Node *)$3;
				}
		;

def_arg:  ColId							{  $$ = (Node *)makeString($1); }
		| all_Op						{  $$ = (Node *)makeString($1); }
		| NumConst						{  $$ = (Node *)$1; /* already a Value */ }
		| Sconst						{  $$ = (Node *)makeString($1); }
		| SETOF ColId
				{
					TypeName *n = makeNode(TypeName);
					n->name = $2;
					n->setof = TRUE;
					n->arrayBounds = NULL;
					$$ = (Node *)n;
				}
		| DOUBLE						{  $$ = (Node *)makeString("double"); }
		;


/*****************************************************************************
 *
 *		QUERY:
 *				destroy <relname1> [, <relname2> .. <relnameN> ]
 *
 *****************************************************************************/

DestroyStmt:  DROP TABLE relation_name_list
				{
					DestroyStmt *n = makeNode(DestroyStmt);
					n->relNames = $3;
					n->sequence = FALSE;
					$$ = (Node *)n;
				}
		| DROP SEQUENCE relation_name_list
				{
					DestroyStmt *n = makeNode(DestroyStmt);
					n->relNames = $3;
					n->sequence = TRUE;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 *		QUERY:
 *			fetch/move [forward | backward] [number | all ] [ in <portalname> ]
 *
 *****************************************************************************/

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

opt_direction:	FORWARD							{ $$ = FORWARD; }
		| BACKWARD								{ $$ = BACKWARD; }
		| /*EMPTY*/								{ $$ = FORWARD; /* default */ }
		;

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

opt_portal_name: IN name				{ $$ = $2;}
		| /*EMPTY*/						{ $$ = NULL; }
		;


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

GrantStmt:  GRANT privileges ON relation_name_list TO grantee opt_with_grant
				{
					$$ = (Node*)makeAclStmt($2,$4,$6,'+');
					free($2);
					free($6);
				}
		;

privileges:  ALL PRIVILEGES
				{
				 $$ = aclmakepriv("rwaR",0);
				}
		| ALL
				{
				 $$ = aclmakepriv("rwaR",0);
				}
		| operation_commalist
				{
				 $$ = $1;
				}
		;

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

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

grantee:  PUBLIC
				{
						$$ = aclmakeuser("A","");
				}
		| GROUP ColId
				{
						$$ = aclmakeuser("G",$2);
				}
		| ColId
				{
						$$ = aclmakeuser("U",$1);
				}
		;

opt_with_grant:  WITH GRANT OPTION
				{
					yyerror("WITH GRANT OPTION is not supported.  Only relation owners can set privileges");
				 }
		| /*EMPTY*/
		;


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

RevokeStmt: REVOKE privileges ON relation_name_list FROM grantee
				{
					$$ = (Node*)makeAclStmt($2,$4,$6,'-');
					free($2);
					free($6);
				}
		;


/*****************************************************************************
 *
 *		QUERY:
 *				define [archive] index <indexname> on <relname>
 *				  using <access> "(" (<col> with <op>)+ ")" [with
 *				  <target_list>]
 *
 *	[where <qual>] is not supported anymore
 *****************************************************************************/

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;
				}
		;

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

access_method_clause:  USING access_method		{ $$ = $2; }
		| /*EMPTY*/								{ $$ = "btree"; }
		;

index_params:  index_list						{ $$ = $1; }
		| func_index							{ $$ = lcons($1,NIL); }
		;

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

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

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

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

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


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

ExtendStmt:  EXTEND INDEX index_name where_clause
				{
					ExtendStmt *n = makeNode(ExtendStmt);
					n->idxname = $3;
					n->whereClause = $4;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 *		QUERY:
 *				execute recipe <recipeName>
 *
 *****************************************************************************/

RecipeStmt:  EXECUTE RECIPE recipe_name
				{
					RecipeStmt *n;
					if (!IsTransactionBlock())
						elog(WARN,"EXECUTE RECIPE may only be used in begin/end transaction blocks",NULL);

					n = makeNode(RecipeStmt);
					n->recipeName = $3;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 *		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>
 *
 *****************************************************************************/

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

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

def_args:  '(' def_name_list ')'				{ $$ = $2; }
		|  '(' ')'								{ $$ = NIL; }
		;

def_name_list:	name_list;


/*****************************************************************************
 *
 *		QUERY:
 *				purge <relname> [before <date>] [after <date>]
 *				  or
 *				purge <relname>  [after <date>] [before <date>]
 *
 *****************************************************************************/

PurgeStmt:	PURGE relation_name purge_quals
				{
					$3->relname = $2;
					$$ = (Node *)$3;
				}
		;

purge_quals:  before_clause
				{
					$$ = makeNode(PurgeStmt);
					$$->beforeDate = $1;
					$$->afterDate = NULL;
				}
		|  after_clause
				{
					$$ = makeNode(PurgeStmt);
					$$->beforeDate = NULL;
					$$->afterDate = $1;
				}
		|  before_clause after_clause
				{
					$$ = makeNode(PurgeStmt);
					$$->beforeDate = $1;
					$$->afterDate = $2;
				}
		|  after_clause before_clause
				{
					$$ = makeNode(PurgeStmt);
					$$->beforeDate = $2;
					$$->afterDate = $1;
				}
		|  /*EMPTY*/
				{
					$$ = makeNode(PurgeStmt);
					$$->beforeDate = NULL;
					$$->afterDate = NULL;
				}
		;

before_clause:	BEFORE date				{ $$ = $2; }
after_clause:	AFTER date				{ $$ = $2; }


/*****************************************************************************
 *
 *		QUERY:
 *
 *		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")
 *
 *****************************************************************************/

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

remove_type:  Type								{  $$ = TYPE_P; }
		|  INDEX								{  $$ = INDEX; }
		|  RULE									{  $$ = RULE; }
		|  VIEW									{  $$ = VIEW; }
		;

RemoveAggrStmt:  DROP AGGREGATE name aggr_argtype
				{
						RemoveAggrStmt *n = makeNode(RemoveAggrStmt);
						n->aggname = $3;
						n->aggtype = $4;
						$$ = (Node *)n;
				}
		;

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

RemoveFuncStmt:  DROP FUNCTION name '(' func_argtypes ')'
				{
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->funcname = $3;
					n->args = $5;
					$$ = (Node *)n;
				}
		;

func_argtypes:	name_list						{ $$ = $1; }
		|  /*EMPTY*/							{ $$ = NIL; }
		;

RemoveOperStmt:  DROP OPERATOR all_Op '(' oper_argtypes ')'
				{
					RemoveOperStmt *n = makeNode(RemoveOperStmt);
					n->opname = $3;
					n->args = $5;
					$$ = (Node *)n;
				}
		;

all_Op: Op | MathOp;

MathOp:	'+'				{ $$ = "+"; }
		|  '-'			{ $$ = "-"; }
		|  '*'			{ $$ = "*"; }
		|  '/'			{ $$ = "/"; }
		|  '<'			{ $$ = "<"; }
		|  '>'			{ $$ = ">"; }
		|  '='			{ $$ = "="; }
		;

oper_argtypes:	name
				{
				   elog(WARN,"parser: argument type missing (use NONE for unary operators)",NULL);
				}
		| 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); }
		;


/*****************************************************************************
 *
 *		QUERY:
 *				rename <attrname1> in <relname> [*] to <attrname2>
 *				rename <relname1> to <relname2>
 *
 *****************************************************************************/

RenameStmt:  ALTER TABLE relation_name opt_inh_star
				  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							{ $$ = $1; }
		|  /*EMPTY*/					{ $$ = NULL; }
		;

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


/*****************************************************************************
 *
 *		QUERY:	Define Rewrite Rule , Define Tuple Rule
 *				Define Rule <old rules >
 *
 *		only rewrite rule is supported -- ay 9/94
 *
 *****************************************************************************/

RuleStmt:  CREATE RULE name AS
		   { 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; }
		;

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

OptStmtMulti:  OptStmtMulti OptimizableStmt ';'
				{  $$ = lappend($1, $2); }
		|  OptStmtMulti OptimizableStmt
				{  $$ = lappend($1, $2); }
		|  OptimizableStmt ';'
				{ $$ = lcons($1, NIL); }
		;

event_object: relation_name '.' attr_name
				{
					$$ = makeNode(Attr);
					$$->relname = $1;
					$$->paramNo = NULL;
					$$->attrs = lcons(makeString($3), NIL);
					$$->indirection = NIL;
				}
		| relation_name
				{
					$$ = makeNode(Attr);
					$$->relname = $1;
					$$->paramNo = NULL;
					$$->attrs = NIL;
					$$->indirection = NIL;
				}
		;

/* change me to select, update, etc. some day */
event:	SELECT							{ $$ = CMD_SELECT; }
		| UPDATE						{ $$ = CMD_UPDATE; }
		| DELETE						{ $$ = CMD_DELETE; }
		| INSERT						{ $$ = CMD_INSERT; }
		 ;

opt_instead:  INSTEAD					{ $$ = TRUE; }
		| /* EMPTY */					{ $$ = FALSE; }
		;


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

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

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


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

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

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

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


/*****************************************************************************
 *
 *		QUERY:
 *				define view <viewname> '('target-list ')' [where <quals> ]
 *
 *****************************************************************************/

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


/*****************************************************************************
 *
 *		QUERY:
 *				load "filename"
 *
 *****************************************************************************/

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


/*****************************************************************************
 *
 *		QUERY:
 *				createdb dbname
 *
 *****************************************************************************/

CreatedbStmt:  CREATE DATABASE database_name
				{
					CreatedbStmt *n = makeNode(CreatedbStmt);
					n->dbname = $3;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 *		QUERY:
 *				destroydb dbname
 *
 *****************************************************************************/

DestroydbStmt:	DROP DATABASE database_name
				{
					DestroydbStmt *n = makeNode(DestroydbStmt);
					n->dbname = $3;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 *		QUERY:
 *				cluster <index_name> on <relation_name>
 *
 *****************************************************************************/

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


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

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

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

opt_analyze:  ANALYZE							{ $$ = TRUE; }
		| /* EMPTY */							{ $$ = FALSE; }
		;

opt_va_list: '(' va_list ')'
				{ $$ = $2; }
		| /* EMPTY */
				{ $$ = NIL; }
		;

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


/*****************************************************************************
 *
 *		QUERY:
 *				EXPLAIN query
 *
 *****************************************************************************/

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


/*****************************************************************************
 *																			 *
 *		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							 *
 *																			 *
 *****************************************************************************/

OptimizableStmt:  RetrieveStmt
		| CursorStmt
		| ReplaceStmt
		| AppendStmt
		| NotifyStmt
		| DeleteStmt					/* by default all are $$=$1 */
		;


/*****************************************************************************
 *
 *		QUERY:
 *				INSERT STATEMENTS
 *
 *****************************************************************************/

AppendStmt:  INSERT INTO relation_name opt_column_list insert_rest
				{
					$5->relname = $3;
					$5->cols = $4;
					$$ = (Node *)$5;
				}
		;

insert_rest: VALUES '(' res_target_list2 ')'
				{
					$$ = makeNode(AppendStmt);
					$$->targetList = $3;
					$$->fromClause = NIL;
					$$->whereClause = NULL;
				}
		| SELECT res_target_list2 from_clause where_clause
				{
					$$ = makeNode(AppendStmt);
					$$->targetList = $2;
					$$->fromClause = $3;
					$$->whereClause = $4;
				}
		;

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

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

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


/*****************************************************************************
 *
 *		QUERY:
 *				DELETE STATEMENTS
 *
 *****************************************************************************/

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


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

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


/*****************************************************************************
 *
 *		QUERY:
 *				CURSOR STATEMENTS
 *
 *****************************************************************************/

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

					/* from PORTAL name */
					/*
					 *	15 august 1991 -- since 3.0 postgres does locking
					 *	right, we discovered that portals were violating
					 *	locking protocol.  portal locks cannot span xacts.
					 *	as a short-term fix, we installed the check here.
					 *							-- mao
					 */
					if (!IsTransactionBlock())
						elog(WARN,"Named portals may only be used in begin/end transaction blocks",NULL);

					n->portalname = $2;
					n->binary = $3;
					n->unique = $7;
					n->targetList = $8;
					n->fromClause = $9;
					n->whereClause = $10;
					n->groupClause = $11;
					n->sortClause = $12;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 *		QUERY:
 *				SELECT STATEMENTS
 *
 *****************************************************************************/

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

union_clause:  UNION select_list				{ $$ = $2; }
		| /*EMPTY*/								{ $$ = NIL; }
		;

select_list:  select_list UNION SubSelect
				{ $$ = lappend($1, $3); }
		| SubSelect
				{ $$ = lcons($1, NIL); }
		;

SubSelect:	SELECT opt_unique res_target_list2
			 result from_clause where_clause
			 group_clause having_clause
				{
					SubSelect *n = makeNode(SubSelect);
					n->unique = $2;
					n->targetList = $3;
					n->fromClause = $5;
					n->whereClause = $6;
					n->groupClause = $7;
					n->havingClause = $8;
					$$ = (Node *)n;
				}
		;

result:  INTO TABLE relation_name
				{  $$= $3;	/* should check for archive level */  }
		| /*EMPTY*/
				{  $$ = NULL;  }
		;

opt_unique:  DISTINCT							{ $$ = "*"; }
		| DISTINCT ON ColId						{ $$ = $3; }
		| /*EMPTY*/								{ $$ = NULL;}
		;

sort_clause:  ORDER BY sortby_list				{ $$ = $3; }
		|  /*EMPTY*/							{ $$ = NIL; }
		;

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

sortby:  ColId OptUseOp
				{
					$$ = makeNode(SortGroupBy);
					$$->resno = 0;
					$$->range = NULL;
					$$->name = $1;
					$$->useOp = $2;
				}
		| ColId '.' ColId OptUseOp
				{
					$$ = makeNode(SortGroupBy);
					$$->resno = 0;
					$$->range = $1;
					$$->name = $3;
					$$->useOp = $4;
				}
		| Iconst OptUseOp
				{
					$$ = makeNode(SortGroupBy);
					$$->resno = $1;
					$$->range = NULL;
					$$->name = NULL;
					$$->useOp = $2;
				}
		;

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

/*
 *	jimmy bell-style recursive queries aren't supported in the
 *	current system.
 *
 *	...however, recursive addattr and rename supported.  make special
 *	cases for these.
 *
 *	XXX i believe '*' should be the default behavior, but...
 */
opt_inh_star:  '*'								{ $$ = TRUE; }
		| /*EMPTY*/								{ $$ = FALSE; }
		;

relation_name_list:  name_list;

name_list:  name
				{	$$ = lcons(makeString($1),NIL); }
		| name_list ',' name
				{	$$ = lappend($1,makeString($3)); }
		;

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

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

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

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


/*****************************************************************************
 *
 *	clauses common to all Optimizable Stmts:
 *		from_clause		-
 *		where_clause	-
 *
 *****************************************************************************/

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

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

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

join_expr:  NATURAL join_expr					{ $$ = NULL; }
		| FULL join_outer
				{ elog(WARN,"FULL OUTER JOIN not yet implemented",NULL); }
		| LEFT join_outer
				{ elog(WARN,"LEFT OUTER JOIN not yet implemented",NULL); }
		| RIGHT join_outer
				{ elog(WARN,"RIGHT OUTER JOIN not yet implemented",NULL); }
		| OUTER_P
				{ elog(WARN,"OUTER JOIN not yet implemented",NULL); }
		| INNER_P
				{ elog(WARN,"INNER JOIN not yet implemented",NULL); }
		| UNION
				{ elog(WARN,"UNION JOIN not yet implemented",NULL); }
		| /*EMPTY*/
				{ elog(WARN,"INNER JOIN not yet implemented",NULL); }
		;

join_outer:  OUTER_P							{ $$ = NULL; }
		| /*EMPTY*/								{ $$ = NULL;  /* no qualifiers */ }
		;

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

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

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

where_clause:  WHERE a_expr						{ $$ = $2; }
		| /*EMPTY*/								{ $$ = NULL;  /* no qualifiers */ }
		;

relation_expr:	relation_name
				{
					/* normal relations */
					$$ = makeNode(RelExpr);
					$$->relname = $1;
					$$->inh = FALSE;
					$$->timeRange = NULL;
				}
		| relation_name '*'				  %prec '='
				{
					/* inheiritance query */
					$$ = makeNode(RelExpr);
					$$->relname = $1;
					$$->inh = TRUE;
					$$->timeRange = NULL;
				}
		| relation_name time_range
				{
					/* time-qualified query */
					$$ = makeNode(RelExpr);
					$$->relname = $1;
					$$->inh = FALSE;
					$$->timeRange = $2;
				}
		;

/* Time travel
 * Range specification clause.
 */
time_range:  '[' opt_range_start ',' opt_range_end ']'
				{
					$$ = makeNode(TimeRange);
					$$->startDate = $2;
					$$->endDate = $4;
				}
		| '[' date ']'
				{
					$$ = makeNode(TimeRange);
					$$->startDate = $2;
					$$->endDate = NULL;
				}
		;

opt_range_start:  date
		|  /*EMPTY*/							{ $$ = "epoch"; }
		;

opt_range_end:	date
		|  /*EMPTY*/							{ $$ = "now"; }
		;

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

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


/*****************************************************************************
 *
 *	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;

					/* Is this the name of a complex type? If so, implement
					 * it as a set.
					 */
					if (!strcmp(saved_relname, $$->name))
						/* This attr is the same type as the relation
						 * being defined. The classic example: create
						 * emp(name=text,mgr=emp)
						 */
						$$->setof = TRUE;
					else if (get_typrelid((Type)type($$->name)) != InvalidOid)
						 /* (Eventually add in here that the set can only
						  * contain one element.)
						  */
						$$->setof = TRUE;
					else
						$$->setof = FALSE;
				}
		| Character
		| SETOF Array
				{
					$$ = $2;
					$$->setof = TRUE;
				}
		;

Array:  Generic
		| Datetime
		| Numeric
		;

Generic:  generic
				{
					$$ = makeNode(TypeName);
					$$->name = xlateSqlType($1);
				}
		;

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

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

opt_float:  '(' Iconst ')'
				{
					if ($2 < 1)
						elog(WARN,"precision for FLOAT must be at least 1",NULL);
					else if ($2 < 7)
						$$ = xlateSqlType("float4");
					else if ($2 < 16)
						$$ = xlateSqlType("float8");
					else
						elog(WARN,"precision for FLOAT must be less than 16",NULL);
				}
		| /*EMPTY*/
				{
					$$ = xlateSqlType("float8");
				}
		;

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

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

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

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

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");
					} else {
						if ($2) {
							c = palloc(strlen("var") + strlen($3) + 1);
							strcpy(c, "var");
							strcat(c, $3);
							type = xlateSqlType(c);
						} else {
							type = xlateSqlType($3);
						}
					};
					if ($4 != NULL)
					elog(WARN,"COLLATE %s not yet implemented",$4);
					$$ = type;
				}
		| CHAR opt_varying						{ $$ = xlateSqlType($2? "varchar": "char"); }
		| VARCHAR								{ $$ = xlateSqlType("varchar"); }
		| NATIONAL CHARACTER opt_varying		{ $$ = xlateSqlType($3? "varchar": "char"); }
		| NCHAR opt_varying						{ $$ = xlateSqlType($2? "varchar": "char"); }
		;

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

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

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

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

datetime:  YEAR_P								{ $$ = "year"; }
		| MONTH_P								{ $$ = "month"; }
		| DAY_P									{ $$ = "day"; }
		| HOUR_P								{ $$ = "hour"; }
		| MINUTE_P								{ $$ = "minute"; }
		| SECOND_P								{ $$ = "second"; }
		;

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

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


/*****************************************************************************
 *
 *	expression grammar, still needs some cleanup
 *
 *****************************************************************************/

a_expr_or_null: a_expr
				{ $$ = $1;}
		| Pnull
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Null;
					$$ = (Node *)n;
				}

a_expr:  attr opt_indirection
				{
					$1->indirection = $2;
					$$ = (Node *)$1;
				}
		| AexprConst
				{	$$ = $1;  }
		| '-' a_expr %prec UMINUS
				{	$$ = makeA_Expr(OP, "-", NULL, $2); }
		| a_expr '+' a_expr
				{	$$ = makeA_Expr(OP, "+", $1, $3); }
		| a_expr '-' a_expr
				{	$$ = makeA_Expr(OP, "-", $1, $3); }
		| a_expr '/' a_expr
				{	$$ = makeA_Expr(OP, "/", $1, $3); }
		| a_expr '*' a_expr
				{	$$ = makeA_Expr(OP, "*", $1, $3); }
		| a_expr '<' a_expr
				{	$$ = makeA_Expr(OP, "<", $1, $3); }
		| a_expr '>' a_expr
				{	$$ = makeA_Expr(OP, ">", $1, $3); }
		| a_expr '=' a_expr
				{	$$ = makeA_Expr(OP, "=", $1, $3); }
		| ':' a_expr
				{	$$ = makeA_Expr(OP, ":", NULL, $2); }
		| ';' a_expr
				{	$$ = makeA_Expr(OP, ";", NULL, $2); }
		| '|' a_expr
				{	$$ = makeA_Expr(OP, "|", NULL, $2); }
		| AexprConst TYPECAST Typename
				{
					/* AexprConst can be either A_Const or ParamNo */
					if (nodeTag($1) == T_A_Const)
						((A_Const *)$1)->typename = $3;
					else
						((ParamNo *)$1)->typename = $3;
					$$ = (Node *)$1;
				}
		| CAST a_expr AS Typename
				{
					$$ = (Node *)$2;
					/* AexprConst can be either A_Const or ParamNo */
					if (nodeTag($2) == T_A_Const) {
						((A_Const *)$2)->typename = $4;
					} else if (nodeTag($2) == T_Param) {
						((ParamNo *)$2)->typename = $4;
					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
						n->funcname = $4->name;
						n->args = lcons($2,NIL);
						$$ = (Node *)n;
					}
				}
		| '(' a_expr_or_null ')'
				{	$$ = $2; }
		| a_expr Op a_expr
				{	$$ = makeA_Expr(OP, $2, $1, $3); }
		| a_expr LIKE a_expr
				{	$$ = makeA_Expr(OP, "~~", $1, $3); }
		| a_expr NOT LIKE a_expr
				{	$$ = makeA_Expr(OP, "!~~", $1, $4); }
		| Op a_expr
				{	$$ = makeA_Expr(OP, $1, NULL, $2); }
		| a_expr Op
				{	$$ = makeA_Expr(OP, $2, $1, NULL); }
		| ColId
				{
					/* could be a column name or a relation_name */
					Ident *n = makeNode(Ident);
					n->name = $1;
					n->indirection = NULL;
					$$ = (Node *)n;
				}
		| name '(' '*' ')'
				{
					FuncCall *n = makeNode(FuncCall);
					Ident *star = makeNode(Ident);

					/* cheap hack for aggregate (eg. count) */
					star->name = "oid";
					n->funcname = $1;
					n->args = lcons(star, NIL);
					$$ = (Node *)n;
				}
		| name '(' ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
					$$ = (Node *)n;
				}
		| CURRENT_DATE
				{
					A_Const *n = makeNode(A_Const);
					TypeName *t = makeNode(TypeName);

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

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

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

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

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

					$$ = (Node *)n;
				}
		| 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;

					if ($3 != 0)
						elog(NOTICE,"CURRENT_TIME(p) precision must be zero",NULL);

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

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

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

					$$ = (Node *)n;
				}
		| 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;

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

					$$ = (Node *)n;
				}
			| CURRENT_USER
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "getpgusername";
					n->args = NIL;
					$$ = (Node *)n;
				}
		/* We probably need to define an "exists" node,
		 *	since the optimizer could choose to find only one match.
		 * Perhaps the first implementation could just check for
		 *	count(*) > 0? - thomas 1997-07-19
		 */
		| EXISTS '(' SubSelect ')'
				{
					elog(WARN,"EXISTS not yet implemented",NULL);
					$$ = $3;
				}
		| EXTRACT '(' extract_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "date_part";
					n->args = $3;
					$$ = (Node *)n;
				}
		| POSITION '(' position_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "strpos";
					n->args = $3;
					$$ = (Node *)n;
				}
		| SUBSTRING '(' substr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "substr";
					n->args = $3;
					$$ = (Node *)n;
				}
		/* various trim expressions are defined in SQL92 - thomas 1997-07-19 */
		| TRIM '(' BOTH trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "btrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' LEADING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "ltrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' TRAILING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "rtrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "btrim";
					n->args = $3;
					$$ = (Node *)n;
				}
		| name '(' expr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					$$ = (Node *)n;
				}
		| a_expr ISNULL
				{	$$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
		| a_expr IS NULL_P
				{	$$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
		| a_expr NOTNULL
				{	$$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
		| a_expr IS NOT NULL_P
				{	$$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
		| a_expr IS TRUE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "t";
					$$ = makeA_Expr(OP, "=", $1, (Node *)n);
				}
		| a_expr IS FALSE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "f";
					$$ = makeA_Expr(OP, "=", $1, (Node *)n);
				}
		| a_expr IS NOT TRUE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "f";
					$$ = makeA_Expr(OP, "=", $1, (Node *)n);
				}
		| a_expr IS NOT FALSE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "t";
					$$ = makeA_Expr(OP, "=", $1, (Node *)n);
				}
		| a_expr BETWEEN AexprConst AND AexprConst
				{
					$$ = makeA_Expr(AND, NULL,
						makeA_Expr(OP, ">=", $1, $3),
						makeA_Expr(OP, "<=", $1, $5));
				}
		| a_expr NOT BETWEEN AexprConst AND AexprConst
				{
					$$ = makeA_Expr(OR, NULL,
						makeA_Expr(OP, "<", $1, $4),
						makeA_Expr(OP, ">", $1, $6));
				}
		| a_expr IN { saved_In_Expr = $1; } '(' in_expr ')'
				{	$$ = $5; }
		| a_expr NOT IN { saved_In_Expr = $1; } '(' not_in_expr ')'
				{	$$ = $6; }
		| a_expr AND a_expr
				{	$$ = makeA_Expr(AND, NULL, $1, $3); }
		| a_expr OR a_expr
				{	$$ = makeA_Expr(OR, NULL, $1, $3); }
		| NOT a_expr
				{	$$ = makeA_Expr(NOT, NULL, NULL, $2); }
		;

opt_indirection:  '[' a_expr ']' opt_indirection
				{
					A_Indices *ai = makeNode(A_Indices);
					ai->lidx = NULL;
					ai->uidx = $2;
					$$ = lcons(ai, $4);
				}
		| '[' a_expr ':' a_expr ']' opt_indirection
				{
					A_Indices *ai = makeNode(A_Indices);
					ai->lidx = $2;
					ai->uidx = $4;
					$$ = lcons(ai, $6);
				}
		| /* EMPTY */
				{	$$ = NIL; }
		;

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

extract_list: datetime FROM a_expr
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = $1;
#ifdef PARSEDEBUG
printf( "string is %s\n", $1);
#endif
					$$ = lappend(lcons((Node *)n,NIL), $3);
				}
		| /* EMPTY */
				{	$$ = NIL; }
		;

position_list: position_expr IN position_expr
				{	$$ = makeList($3, $1, -1); }
		| /* EMPTY */
				{	$$ = NIL; }
		;

position_expr:  attr opt_indirection
				{
					$1->indirection = $2;
					$$ = (Node *)$1;
				}
		| AexprConst
				{	$$ = $1;  }
		| '-' position_expr %prec UMINUS
				{	$$ = makeA_Expr(OP, "-", NULL, $2); }
		| position_expr '+' position_expr
				{	$$ = makeA_Expr(OP, "+", $1, $3); }
		| position_expr '-' position_expr
				{	$$ = makeA_Expr(OP, "-", $1, $3); }
		| position_expr '/' position_expr
				{	$$ = makeA_Expr(OP, "/", $1, $3); }
		| position_expr '*' position_expr
				{	$$ = makeA_Expr(OP, "*", $1, $3); }
		| '|' position_expr
				{	$$ = makeA_Expr(OP, "|", NULL, $2); }
		| AexprConst TYPECAST Typename
				{
					/* AexprConst can be either A_Const or ParamNo */
					if (nodeTag($1) == T_A_Const)
						((A_Const *)$1)->typename = $3;
					else
						((ParamNo *)$1)->typename = $3;
					$$ = (Node *)$1;
				}
		| CAST position_expr AS Typename
				{
					$$ = (Node *)$2;
					/* AexprConst can be either A_Const or ParamNo */
					if (nodeTag($2) == T_A_Const) {
						((A_Const *)$2)->typename = $4;
					} else if (nodeTag($2) == T_Param) {
						((ParamNo *)$2)->typename = $4;
					/* otherwise, try to transform to a function call */
					} else {
						FuncCall *n = makeNode(FuncCall);
						n->funcname = $4->name;
						n->args = lcons($2,NIL);
						$$ = (Node *)n;
					}
				}
		| '(' position_expr ')'
				{	$$ = $2; }
		| position_expr Op position_expr
				{	$$ = makeA_Expr(OP, $2, $1, $3); }
		| Op position_expr
				{	$$ = makeA_Expr(OP, $1, NULL, $2); }
		| position_expr Op
				{	$$ = makeA_Expr(OP, $2, $1, NULL); }
		| ColId
				{
					/* could be a column name or a relation_name */
					Ident *n = makeNode(Ident);
					n->name = $1;
					n->indirection = NULL;
					$$ = (Node *)n;
				}
		| name '(' ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
					$$ = (Node *)n;
				}
		| POSITION '(' position_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "strpos";
					n->args = $3;
					$$ = (Node *)n;
				}
		| SUBSTRING '(' substr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "substr";
					n->args = $3;
					$$ = (Node *)n;
				}
		/* various trim expressions are defined in SQL92 - thomas 1997-07-19 */
		| TRIM '(' BOTH trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "btrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' LEADING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "ltrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' TRAILING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "rtrim";
					n->args = $4;
					$$ = (Node *)n;
				}
		| TRIM '(' trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = "btrim";
					n->args = $3;
					$$ = (Node *)n;
				}
		| name '(' expr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					$$ = (Node *)n;
				}
		;

substr_list: expr_list substr_from substr_for
				{
					$$ = nconc(nconc($1,$2),$3);
				}
		| /* EMPTY */
				{	$$ = NIL; }
		;

substr_from: FROM expr_list
				{	$$ = $2; }
		| /* EMPTY */
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Integer;
					n->val.val.ival = 1;
					$$ = lcons((Node *)n,NIL);
				}
		;

substr_for: FOR expr_list
				{	$$ = $2; }
		| /* EMPTY */
				{	$$ = NIL; }
		;

trim_list: a_expr FROM expr_list
				{ $$ = lappend($3, $1); }
		|  FROM expr_list
				{ $$ = $2; }
		|  expr_list
				{ $$ = $1; }
		;

in_expr:  SubSelect
				{
					elog(WARN,"IN (SUBSELECT) not yet implemented",NULL);
					$$ = $1;
				}
		| in_expr_nodes
				{	$$ = $1; }
		;

in_expr_nodes: AexprConst
				{	$$ = makeA_Expr(OP, "=", saved_In_Expr, $1); }
		|  in_expr_nodes ',' AexprConst
				{	$$ = makeA_Expr(OR, NULL, $1,
						makeA_Expr(OP, "=", saved_In_Expr, $3));
				}
		;

not_in_expr:  SubSelect
				{
					elog(WARN,"NOT IN (SUBSELECT) not yet implemented",NULL);
					$$ = $1;
				}
		| not_in_expr_nodes
				{	$$ = $1; }
		;

not_in_expr_nodes: AexprConst
				{	$$ = makeA_Expr(OP, "<>", saved_In_Expr, $1); }
		|  not_in_expr_nodes ',' AexprConst
				{	$$ = makeA_Expr(AND, NULL, $1,
						makeA_Expr(OP, "<>", saved_In_Expr, $3));
				}
		;

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


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

res_target_list:  res_target_list ',' res_target_el
				{	$$ = lappend($1,$3);  }
		| res_target_el
				{	$$ = 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);
				}
		;

res_target_el: ColId opt_indirection '=' a_expr_or_null
				{
					$$ = makeNode(ResTarget);
					$$->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;
				}
		;

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

/* AS is not optional because shift/red conflict with unary ops */
res_target_el2: a_expr_or_null AS ColLabel
				{
					$$ = makeNode(ResTarget);
					$$->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;
				}
		;

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

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

database_name:			ColId			{ $$ = $1; };
access_method:			Id				{ $$ = $1; };
attr_name:				ColId			{ $$ = $1; };
class:					Id				{ $$ = $1; };
index_name:				ColId			{ $$ = $1; };

/* Functions
 * Include date/time keywords as SQL92 extension.
 * Include TYPE as a SQL92 unreserved keyword. - thomas 1997-10-05
 */
name:					ColId			{ $$ = $1; };

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

/* Constants
 * Include TRUE/FALSE for SQL3 support. - thomas 1997-10-24
 */
AexprConst:  Iconst
				{
					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;
					$$ = (Node *)n;
				}
		| ParamNo
				{	$$ = (Node *)$1;  }
		| TRUE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "t";
					$$ = (Node *)n;
				}
		| FALSE_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = "f";
					$$ = (Node *)n;
				}
		;

ParamNo:  PARAM
				{
					$$ = makeNode(ParamNo);
					$$->number = $1;
				}
		;

NumConst:  Iconst						{ $$ = makeInteger($1); }
		|  FCONST						{ $$ = makeFloat($1); }
		;

Iconst:  ICONST							{ $$ = $1; };
Sconst:  SCONST							{ $$ = $1; };

/* 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
 */
Id:  IDENT								{ $$ = $1; };

/* Column identifier
 * Include date/time keywords as SQL92 extension.
 * Include TYPE as a SQL92 unreserved keyword. - thomas 1997-10-05
 */
ColId:  Id								{ $$ = $1; }
		| datetime						{ $$ = $1; }
		| TIME							{ $$ = "time"; }
		| TYPE_P						{ $$ = "type"; }
		;

/* 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
 */
ColLabel:  ColId						{ $$ = $1; }
		| TRUE_P						{ $$ = "true"; }
		| FALSE_P						{ $$ = "false"; }
		;

SpecialRuleRelation:  CURRENT
				{
					if (QueryIsRule)
						$$ = "*CURRENT*";
					else
						elog(WARN,"CURRENT used in non-rule query",NULL);
				}
		| NEW
				{
					if (QueryIsRule)
						$$ = "*NEW*";
					else
						elog(WARN,"NEW used in non-rule query",NULL);
				}
		;

Type:	TYPE_P;
Pnull:	NULL_P;

%%

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

/* xlateSqlType()
 * Convert alternate type names to internal Postgres types.
 * Do not convert "float", since that is handled elsewhere
 *  for FLOAT(p) syntax.
 */
static char *
xlateSqlType(char *name)
{
	if (!strcasecmp(name,"int") ||
		!strcasecmp(name,"integer"))
		return "int4";
	else if (!strcasecmp(name, "smallint"))
		return "int2";
	else if (!strcasecmp(name, "real"))
		return "float8";
	else if (!strcasecmp(name, "interval"))
		return "timespan";
	else if (!strcasecmp(name, "boolean"))
		return "bool";
	else
		return name;
} /* xlateSqlName() */

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

	param_type_init(typev, nargs);
}

/* FlattenStringList()
 * Traverse list of string nodes and convert to a single string.
 * Used for reconstructing string form of complex expressions.
 *
 * Allocate at least one byte for terminator.
 */
static char *
FlattenStringList(List *list)
{
	List *l;
	Value *v;
	char *s;
	char *sp;
	int nlist, len = 0;

	nlist = length(list);
#ifdef PARSEDEBUG
printf( "list has %d elements\n", nlist);
#endif
	l = list;
	while(l != NIL) {
		v = (Value *)lfirst(l);
		sp = v->val.str;
		l = lnext(l);
#ifdef PARSEDEBUG
printf( "sp is x%8p; length of %s is %d\n", sp, sp, strlen(sp));
#endif
		len += strlen(sp);
	};
	len += nlist;

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

	l = list;
	while(l != NIL) {
		v = (Value *)lfirst(l);
		sp = v->val.str;
		l = lnext(l);
#ifdef PARSEDEBUG
printf( "length of %s is %d\n", sp, strlen(sp));
#endif
		strcat(s,sp);
		if (l != NIL) strcat(s," ");
	};
	*(s+len) = '\0';

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

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

/* makeConstantList()
 * Convert constant value node into string node.
 */
static List *
makeConstantList( A_Const *n)
{
	char *defval = NULL;
#ifdef PARSEDEBUG
printf( "in AexprConst\n");
#endif
	if (nodeTag(n) != T_A_Const) {
		elog(WARN,"Cannot handle non-constant parameter",NULL);

	} else if (n->val.type == T_Float) {
#ifdef PARSEDEBUG
printf( "AexprConst float is %f\n", n->val.val.dval);
#endif
		defval = (char*) palloc(20+1);
		sprintf( defval, "%g", n->val.val.dval);

	} else if (n->val.type == T_Integer) {
#ifdef PARSEDEBUG
printf( "AexprConst integer is %ld\n", n->val.val.ival);
#endif
		defval = (char*) palloc(20+1);
		sprintf( defval, "%ld", n->val.val.ival);

	} else if (n->val.type == T_String) {

#ifdef PARSEDEBUG
printf( "AexprConst string is \"%s\"\n", n->val.val.str);
#endif

		defval = (char*) palloc(strlen( ((A_Const *) n)->val.val.str) + 3);
		strcpy( defval, "'");
		strcat( defval, ((A_Const *) n)->val.val.str);
		strcat( defval, "'");

	} else {
		elog(WARN,"Internal error: cannot encode node",NULL);
	};

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

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