%{

/*#define YYDEBUG 1*/
/*-------------------------------------------------------------------------
 *
 * gram.y
 *	  POSTGRES SQL YACC rules/actions
 *
 * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.568 2006/11/05 22:42:09 tgl 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.
 *
 *	  In general, nothing in this file should initiate database accesses
 *	  nor depend on changeable state (such as SET variables).  If you do
 *	  database accesses, your code will fail when we have aborted the
 *	  current transaction and are just parsing commands to find the next
 *	  ROLLBACK or COMMIT.  If you make use of SET variables, then you
 *	  will do the wrong thing in multi-query strings like this:
 *			SET SQL_inheritance TO off; SELECT * FROM foo;
 *	  because the entire string is parsed by gram.y before the SET gets
 *	  executed.  Anything that depends on the database or changeable state
 *	  should be handled inside parse_analyze() so that it happens at the
 *	  right time not the wrong time.  The handling of SQL_inheritance is
 *	  a good example.
 *
 * WARNINGS
 *	  If you use a list, make sure the datum is a node so that the printing
 *	  routines work.
 *
 *	  Sometimes we assign constants to makeStrings. Make sure we don't free
 *	  those.
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include <ctype.h>
#include <limits.h>

#include "catalog/index.h"
#include "catalog/namespace.h"
#include "commands/defrem.h"
#include "nodes/makefuncs.h"
#include "parser/gramparse.h"
#include "storage/lmgr.h"
#include "utils/date.h"
#include "utils/datetime.h"
#include "utils/numeric.h"


/* Location tracking support --- simpler than bison's default */
#define YYLLOC_DEFAULT(Current, Rhs, N) \
	do { \
		if (N) \
			(Current) = (Rhs)[1]; \
		else \
			(Current) = (Rhs)[0]; \
	} while (0)

/*
 * The %name-prefix option below will make bison call base_yylex, but we
 * really want it to call filtered_base_yylex (see parser.c).
 */
#define base_yylex filtered_base_yylex

extern List *parsetree;			/* final parse result is delivered here */

static bool QueryIsRule = FALSE;

/*
 * 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 Node *makeColumnRef(char *relname, List *indirection, int location);
static Node *makeTypeCast(Node *arg, TypeName *typename);
static Node *makeStringConst(char *str, TypeName *typename);
static Node *makeIntConst(int val);
static Node *makeFloatConst(char *str);
static Node *makeAConst(Value *v);
static A_Const *makeBoolAConst(bool state);
static FuncCall *makeOverlaps(List *largs, List *rargs, int location);
static void check_qualified_name(List *names);
static List *check_func_name(List *names);
static List *extractArgTypes(List *parameters);
static SelectStmt *findLeftmostSelect(SelectStmt *node);
static void insertSelectOptions(SelectStmt *stmt,
								List *sortClause, List *lockingClause,
								Node *limitOffset, Node *limitCount);
static Node *makeSetOp(SetOperation op, bool all, Node *larg, Node *rarg);
static Node *doNegate(Node *n, int location);
static void doNegateFloat(Value *v);

%}

%name-prefix="base_yy"
%locations

%union
{
	int					ival;
	char				chr;
	char				*str;
	const char			*keyword;
	bool				boolean;
	JoinType			jtype;
	DropBehavior		dbehavior;
	OnCommitAction		oncommit;
	List				*list;
	Node				*node;
	Value				*value;
	ObjectType			objtype;

	TypeName			*typnam;
	FunctionParameter   *fun_param;
	FunctionParameterMode fun_param_mode;
	FuncWithArgs		*funwithargs;
	DefElem				*defelt;
	SortBy				*sortby;
	JoinExpr			*jexpr;
	IndexElem			*ielem;
	Alias				*alias;
	RangeVar			*range;
	A_Indices			*aind;
	ResTarget			*target;
	PrivTarget			*privtarget;

	InsertStmt			*istmt;
	VariableSetStmt		*vsetstmt;
}

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

%type <node>	select_no_parens select_with_parens select_clause
				simple_select values_clause

%type <node>	alter_column_default opclass_item alter_using
%type <ival>	add_drop

%type <node>	alter_table_cmd alter_rel_cmd
%type <list>	alter_table_cmds alter_rel_cmds

%type <dbehavior>	opt_drop_behavior

%type <list>	createdb_opt_list alterdb_opt_list copy_opt_list
				transaction_mode_list
%type <defelt>	createdb_opt_item alterdb_opt_item copy_opt_item
				transaction_mode_item

%type <ival>	opt_lock lock_type cast_context
%type <boolean>	opt_force opt_or_replace
				opt_grant_grant_option opt_grant_admin_option
				opt_nowait opt_if_exists

%type <list>	OptRoleList
%type <defelt>	OptRoleElem

%type <str>		OptSchemaName
%type <list>	OptSchemaEltList

%type <boolean> TriggerActionTime TriggerForSpec opt_trusted
%type <str>		opt_lancompiler

%type <str>		TriggerEvents
%type <value>	TriggerFuncArg

%type <str>		relation_name copy_file_name
				database_name access_method_clause access_method attr_name
				index_name name function_name file_name

%type <list>	func_name handler_name qual_Op qual_all_Op subquery_Op
				opt_class opt_validator

%type <range>	qualified_name OptConstrFromTable

%type <str>		all_Op MathOp SpecialRuleRelation

%type <str>		iso_level opt_encoding
%type <node>	grantee
%type <list>	grantee_list
%type <str>		privilege
%type <list>	privileges privilege_list
%type <privtarget> privilege_target
%type <funwithargs> function_with_argtypes
%type <list>	function_with_argtypes_list
%type <chr> 	TriggerOneEvent

%type <list>	stmtblock stmtmulti
				OptTableElementList TableElementList OptInherit definition
				OptWith opt_distinct opt_definition func_args func_args_list
				func_as createfunc_opt_list alterfunc_opt_list
				aggr_args aggr_args_list old_aggr_definition old_aggr_list
				oper_argtypes RuleActionList RuleActionMulti
				opt_column_list columnList opt_name_list
				sort_clause opt_sort_clause sortby_list index_params
				name_list from_clause from_list opt_array_bounds
				qualified_name_list any_name any_name_list
				any_operator expr_list attrs
				target_list insert_column_list set_target_list
				set_clause_list set_clause multiple_set_clause
				ctext_expr_list ctext_row def_list indirection opt_indirection
				group_clause TriggerFuncArgs select_limit
				opt_select_limit opclass_item_list
				transaction_mode_list_or_empty
				TableFuncElementList
				prep_type_clause prep_type_list
				execute_param_clause using_clause returning_clause

%type <range>	into_clause OptTempTableName

%type <defelt>	createfunc_opt_item common_func_opt_item
%type <fun_param> func_arg
%type <fun_param_mode> arg_class
%type <typnam>	func_return func_type

%type <boolean>  TriggerForType OptTemp
%type <oncommit> OnCommitOption

%type <node>	for_locking_item
%type <list>	for_locking_clause opt_for_locking_clause for_locking_items
%type <list>	locked_rels_list
%type <boolean>	opt_all

%type <node>	join_outer join_qual
%type <jtype>	join_type

%type <list>	extract_list overlay_list position_list
%type <list>	substr_list trim_list
%type <ival>	opt_interval
%type <node>	overlay_placing substr_from substr_for

%type <boolean> opt_instead opt_analyze
%type <boolean> index_opt_unique opt_verbose opt_full
%type <boolean> opt_freeze opt_default opt_recheck
%type <defelt>	opt_binary opt_oids copy_delimiter

%type <boolean> copy_from opt_hold

%type <ival>	opt_column event cursor_options
%type <objtype>	reindex_type drop_type comment_type

%type <node>	fetch_direction select_limit_value select_offset_value

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

%type <istmt>	insert_rest

%type <vsetstmt> set_rest

%type <node>	TableElement ConstraintElem TableFuncElement
%type <node>	columnDef
%type <defelt>	def_elem old_aggr_elem
%type <node>	def_arg columnElem where_clause
				a_expr b_expr c_expr func_expr AexprConst indirection_el
				columnref in_expr having_clause func_table array_expr
%type <list>	row type_list array_expr_list
%type <node>	case_expr case_arg when_clause case_default
%type <list>	when_clause_list
%type <ival>	sub_type
%type <list>	OptCreateAs CreateAsList
%type <node>	CreateAsElement ctext_expr
%type <value>	NumericOnly FloatOnly IntegerOnly
%type <alias>	alias_clause
%type <sortby>	sortby
%type <ielem>	index_elem
%type <node>	table_ref
%type <jexpr>	joined_table
%type <range>	relation_expr
%type <range>	relation_expr_opt_alias
%type <target>	target_el single_set_clause set_target insert_column_item

%type <typnam>	Typename SimpleTypename ConstTypename
				GenericType Numeric opt_float
				Character ConstCharacter
				CharacterWithLength CharacterWithoutLength
				ConstDatetime ConstInterval
				Bit ConstBit BitWithLength BitWithoutLength
%type <str>		character
%type <str>		extract_arg
%type <str>		opt_charset
%type <ival>	opt_numeric opt_decimal
%type <boolean> opt_varying opt_timezone

%type <ival>	Iconst SignedIconst
%type <str>		Sconst comment_text
%type <str>		RoleId opt_granted_by opt_boolean ColId_or_Sconst
%type <list>	var_list var_list_or_default
%type <str>		ColId ColLabel var_name type_name param_name
%type <node>	var_value zone_value

%type <keyword> unreserved_keyword func_name_keyword
%type <keyword> col_name_keyword reserved_keyword

%type <node>	TableConstraint TableLikeClause 
%type <list>	TableLikeOptionList
%type <ival>	TableLikeOption
%type <list>	ColQualList
%type <node>	ColConstraint ColConstraintElem ConstraintAttr
%type <ival>	key_actions key_delete key_match key_update key_action
%type <ival>	ConstraintAttributeSpec ConstraintDeferrabilitySpec
				ConstraintTimeSpec

%type <list>	constraints_set_list
%type <boolean> constraints_set_mode
%type <str>		OptTableSpace OptConsTableSpace OptTableSpaceOwner
%type <list>	opt_check_option


/*
 * If you make any token changes, update the keyword table in
 * parser/keywords.c and add new keywords to the appropriate one of
 * the reserved-or-not-so-reserved keyword lists, below; search
 * this file for "Name classification hierarchy".
 */

/* ordinary key words in alphabetical order */
%token <keyword> ABORT_P ABSOLUTE_P ACCESS ACTION ADD_P ADMIN AFTER
	AGGREGATE ALL ALSO ALTER ANALYSE ANALYZE AND ANY ARRAY AS ASC
	ASSERTION ASSIGNMENT ASYMMETRIC AT AUTHORIZATION

	BACKWARD BEFORE BEGIN_P BETWEEN BIGINT BINARY BIT
	BOOLEAN_P BOTH BY

	CACHE CALLED CASCADE CASCADED CASE CAST CHAIN CHAR_P
	CHARACTER CHARACTERISTICS CHECK CHECKPOINT CLASS CLOSE
	CLUSTER COALESCE COLLATE COLUMN COMMENT COMMIT
	COMMITTED CONCURRENTLY CONNECTION CONSTRAINT CONSTRAINTS
	CONVERSION_P CONVERT COPY CREATE CREATEDB
	CREATEROLE CREATEUSER CROSS CSV CURRENT_DATE CURRENT_ROLE CURRENT_TIME
	CURRENT_TIMESTAMP CURRENT_USER CURSOR CYCLE

	DATABASE DAY_P DEALLOCATE DEC DECIMAL_P DECLARE DEFAULT DEFAULTS
	DEFERRABLE DEFERRED DEFINER DELETE_P DELIMITER DELIMITERS
	DESC DISABLE_P DISTINCT DO DOMAIN_P DOUBLE_P DROP

	EACH ELSE ENABLE_P ENCODING ENCRYPTED END_P ESCAPE EXCEPT EXCLUDING
	EXCLUSIVE EXECUTE EXISTS EXPLAIN EXTERNAL EXTRACT

	FALSE_P FETCH FIRST_P FLOAT_P FOR FORCE FOREIGN FORWARD
	FREEZE FROM FULL FUNCTION

	GLOBAL GRANT GRANTED GREATEST GROUP_P

	HANDLER HAVING HEADER_P HOLD HOUR_P

	IF_P ILIKE IMMEDIATE IMMUTABLE IMPLICIT_P IN_P INCLUDING INCREMENT
	INDEX INDEXES INHERIT INHERITS INITIALLY INNER_P INOUT INPUT_P
	INSENSITIVE INSERT INSTEAD INT_P INTEGER INTERSECT
	INTERVAL INTO INVOKER IS ISNULL ISOLATION

	JOIN

	KEY

	LANCOMPILER LANGUAGE LARGE_P  LAST_P LEADING LEAST LEFT LEVEL
	LIKE LIMIT LISTEN LOAD LOCAL LOCALTIME LOCALTIMESTAMP LOCATION
	LOCK_P LOGIN_P

	MATCH MAXVALUE MINUTE_P MINVALUE MODE MONTH_P MOVE

	NAMES NATIONAL NATURAL NCHAR NEW NEXT NO NOCREATEDB
	NOCREATEROLE NOCREATEUSER NOINHERIT NOLOGIN_P NONE NOSUPERUSER
	NOT NOTHING NOTIFY NOTNULL NOWAIT NULL_P NULLIF NUMERIC

	OBJECT_P OF OFF OFFSET OIDS OLD ON ONLY OPERATOR OPTION OR
	ORDER OUT_P OUTER_P OVERLAPS OVERLAY OWNED OWNER

	PARTIAL PASSWORD PLACING POSITION
	PRECISION PRESERVE PREPARE PREPARED PRIMARY
	PRIOR PRIVILEGES PROCEDURAL PROCEDURE

	QUOTE

	READ REAL REASSIGN RECHECK REFERENCES REINDEX RELATIVE_P RELEASE RENAME
	REPEATABLE REPLACE REPLICATION RESET RESTART RESTRICT RETURNING RETURNS REVOKE RIGHT
	ROLE ROLLBACK ROW ROWS RULE

	SAVEPOINT SCHEMA SCROLL SECOND_P SECURITY SELECT SEQUENCE SERVER
	SERIALIZABLE SESSION SESSION_USER SET SETOF SHARE
	SHOW SIMILAR SIMPLE SMALLINT SOME STABLE START STATEMENT
	STATISTICS STDIN STDOUT STORAGE STRICT_P SUBSTRING SUPERUSER_P SYMMETRIC
	SYSID SYSTEM_P

	TABLE TABLESPACE TEMP TEMPLATE TEMPORARY THEN TIME TIMESTAMP
	TO TRAILING TRANSACTION TREAT TRIGGER TRIM TRUE_P
	TRUNCATE TRUSTED TYPE_P

	UNCOMMITTED UNENCRYPTED UNION UNIQUE UNKNOWN UNLISTEN UNTIL
	UPDATE USER USING

	VACUUM VALID VALIDATOR VALUES VARCHAR VARYING
	VERBOSE VIEW VOLATILE

	WHEN WHERE WITH WITHOUT WORK WRITE

	YEAR_P

	ZONE

/* The grammar thinks these are keywords, but they are not in the keywords.c
 * list and so can never be entered directly.  The filter in parser.c
 * creates these tokens when required.
 */
%token			WITH_CASCADED WITH_LOCAL WITH_CHECK

/* Special token types, not actually keywords - see the "lex" file */
%token <str>	IDENT FCONST SCONST BCONST XCONST Op
%token <ival>	ICONST PARAM

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

/*
 *	Handle comment-only lines, and ;; SELECT * FROM pg_class ;;;
 *	psql already handles such cases, but other interfaces don't.
 *	bjm 1999/10/05
 */
stmtblock:	stmtmulti								{ parsetree = $1; }
		;

/* the thrashing around here is to discard "empty" statements... */
stmtmulti:	stmtmulti ';' stmt
				{ if ($3 != NULL)
					$$ = lappend($1, $3);
				  else
					$$ = $1;
				}
			| stmt
					{ if ($1 != NULL)
						$$ = list_make1($1);
					  else
						$$ = NIL;
					}
		;

stmt :
			AlterDatabaseStmt
			| AlterDatabaseSetStmt
			| AlterDomainStmt
			| AlterFunctionStmt
			| AlterGroupStmt
			| AlterObjectSchemaStmt
			| AlterOwnerStmt
			| AlterSeqStmt
			| AlterTableStmt
			| AlterRoleSetStmt
			| AlterRoleStmt
			| AlterUserSetStmt
			| AlterUserStmt
			| AnalyzeStmt
			| CheckPointStmt
			| ClosePortalStmt
			| ClusterStmt
			| CommentStmt
			| ConstraintsSetStmt
			| CopyStmt
			| CreateAsStmt
			| CreateAssertStmt
			| CreateCastStmt
			| CreateConversionStmt
			| CreateDomainStmt
			| CreateFunctionStmt
			| CreateGroupStmt
			| CreateOpClassStmt
			| CreatePLangStmt
			| CreateSchemaStmt
			| CreateSeqStmt
			| CreateStmt
			| CreateTableSpaceStmt
			| CreateTrigStmt
			| CreateRoleStmt
			| CreateUserStmt
			| CreatedbStmt
			| DeallocateStmt
			| DeclareCursorStmt
			| DefineStmt
			| DeleteStmt
			| DropAssertStmt
			| DropCastStmt
			| DropGroupStmt
			| DropOpClassStmt
			| DropOwnedStmt
			| DropPLangStmt
			| DropRuleStmt
			| DropStmt
			| DropTableSpaceStmt
			| DropTrigStmt
			| DropRoleStmt
			| DropUserStmt
			| DropdbStmt
			| ExecuteStmt
			| ExplainStmt
			| FetchStmt
			| GrantStmt
			| GrantRoleStmt
			| IndexStmt
			| InsertStmt
			| ListenStmt
			| LoadStmt
			| LockStmt
			| NotifyStmt
			| PrepareStmt
			| ReassignOwnedStmt
			| ReindexStmt
			| RemoveAggrStmt
			| RemoveFuncStmt
			| RemoveOperStmt
			| RenameStmt
			| RevokeStmt
			| RevokeRoleStmt
			| RuleStmt
			| SelectStmt
			| TransactionStmt
			| TruncateStmt
			| UnlistenStmt
			| UpdateStmt
			| VacuumStmt
			| VariableResetStmt
			| VariableSetStmt
			| VariableShowStmt
			| ViewStmt
			| /*EMPTY*/
				{ $$ = NULL; }
		;

/*****************************************************************************
 *
 * Create a new Postgres DBMS role
 *
 *****************************************************************************/

CreateRoleStmt:
			CREATE ROLE RoleId opt_with OptRoleList
				{
					CreateRoleStmt *n = makeNode(CreateRoleStmt);
					n->stmt_type = ROLESTMT_ROLE;
					n->role = $3;
					n->options = $5;
					$$ = (Node *)n;
				}
		;


opt_with:	WITH									{}
			| /*EMPTY*/								{}
		;

/*
 * Options for CREATE ROLE and ALTER ROLE (also used by CREATE/ALTER USER
 * for backwards compatibility).  Note: the only option required by SQL99
 * is "WITH ADMIN name".
 */
OptRoleList:
			OptRoleList OptRoleElem					{ $$ = lappend($1, $2); }
			| /* EMPTY */							{ $$ = NIL; }
		;

OptRoleElem:
			PASSWORD Sconst
				{
					$$ = makeDefElem("password",
									 (Node *)makeString($2));
				}
			| PASSWORD NULL_P
				{
					$$ = makeDefElem("password", NULL);
				}
			| ENCRYPTED PASSWORD Sconst
				{
					$$ = makeDefElem("encryptedPassword",
									 (Node *)makeString($3));
				}
			| UNENCRYPTED PASSWORD Sconst
				{
					$$ = makeDefElem("unencryptedPassword",
									 (Node *)makeString($3));
				}
			| SUPERUSER_P
				{
					$$ = makeDefElem("superuser", (Node *)makeInteger(TRUE));
				}
			| NOSUPERUSER
				{
					$$ = makeDefElem("superuser", (Node *)makeInteger(FALSE));
				}
			| INHERIT
				{
					$$ = makeDefElem("inherit", (Node *)makeInteger(TRUE));
				}
			| NOINHERIT
				{
					$$ = makeDefElem("inherit", (Node *)makeInteger(FALSE));
				}
			| CREATEDB
				{
					$$ = makeDefElem("createdb", (Node *)makeInteger(TRUE));
				}
			| NOCREATEDB
				{
					$$ = makeDefElem("createdb", (Node *)makeInteger(FALSE));
				}
			| CREATEROLE
				{
					$$ = makeDefElem("createrole", (Node *)makeInteger(TRUE));
				}
			| NOCREATEROLE
				{
					$$ = makeDefElem("createrole", (Node *)makeInteger(FALSE));
				}
			| CREATEUSER
				{
					/* For backwards compatibility, synonym for SUPERUSER */
					$$ = makeDefElem("superuser", (Node *)makeInteger(TRUE));
				}
			| NOCREATEUSER
				{
					$$ = makeDefElem("superuser", (Node *)makeInteger(FALSE));
				}
			| LOGIN_P
				{
					$$ = makeDefElem("canlogin", (Node *)makeInteger(TRUE));
				}
			| NOLOGIN_P
				{
					$$ = makeDefElem("canlogin", (Node *)makeInteger(FALSE));
				}
			| CONNECTION LIMIT SignedIconst
				{
					$$ = makeDefElem("connectionlimit", (Node *)makeInteger($3));
				}
			| VALID UNTIL Sconst
				{
					$$ = makeDefElem("validUntil", (Node *)makeString($3));
				}
		/*	Supported but not documented for roles, for use by ALTER GROUP. */
			| USER name_list
				{
					$$ = makeDefElem("rolemembers", (Node *)$2);
				}
		/* The following are not supported by ALTER ROLE/USER/GROUP */
			| SYSID Iconst
				{
					$$ = makeDefElem("sysid", (Node *)makeInteger($2));
				}
			| ADMIN name_list
				{
					$$ = makeDefElem("adminmembers", (Node *)$2);
				}
			| ROLE name_list
				{
					$$ = makeDefElem("rolemembers", (Node *)$2);
				}
			| IN_P ROLE name_list
				{
					$$ = makeDefElem("addroleto", (Node *)$3);
				}
			| IN_P GROUP_P name_list
				{
					$$ = makeDefElem("addroleto", (Node *)$3);
				}
		;


/*****************************************************************************
 *
 * Create a new Postgres DBMS user (role with implied login ability)
 *
 *****************************************************************************/

CreateUserStmt:
			CREATE USER RoleId opt_with OptRoleList
				{
					CreateRoleStmt *n = makeNode(CreateRoleStmt);
					n->stmt_type = ROLESTMT_USER;
					n->role = $3;
					n->options = $5;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 * Alter a postgresql DBMS role
 *
 *****************************************************************************/

AlterRoleStmt:
			ALTER ROLE RoleId opt_with OptRoleList
				 {
					AlterRoleStmt *n = makeNode(AlterRoleStmt);
					n->role = $3;
					n->action = +1;	/* add, if there are members */
					n->options = $5;
					$$ = (Node *)n;
				 }
		;

AlterRoleSetStmt:
			ALTER ROLE RoleId SET set_rest
				{
					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
					n->role = $3;
					n->variable = $5->name;
					n->value = $5->args;
					$$ = (Node *)n;
				}
			| ALTER ROLE RoleId VariableResetStmt
				{
					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
					n->role = $3;
					n->variable = ((VariableResetStmt *)$4)->name;
					n->value = NIL;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 * Alter a postgresql DBMS user
 *
 *****************************************************************************/

AlterUserStmt:
			ALTER USER RoleId opt_with OptRoleList
				 {
					AlterRoleStmt *n = makeNode(AlterRoleStmt);
					n->role = $3;
					n->action = +1;	/* add, if there are members */
					n->options = $5;
					$$ = (Node *)n;
				 }
		;


AlterUserSetStmt:
			ALTER USER RoleId SET set_rest
				{
					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
					n->role = $3;
					n->variable = $5->name;
					n->value = $5->args;
					$$ = (Node *)n;
				}
			| ALTER USER RoleId VariableResetStmt
				{
					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
					n->role = $3;
					n->variable = ((VariableResetStmt *)$4)->name;
					n->value = NIL;
					$$ = (Node *)n;
				}
			;


/*****************************************************************************
 *
 * Drop a postgresql DBMS role
 *
 * XXX Ideally this would have CASCADE/RESTRICT options, but since a role
 * might own objects in multiple databases, there is presently no way to
 * implement either cascading or restricting.  Caveat DBA.
 *****************************************************************************/

DropRoleStmt:
			DROP ROLE name_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = FALSE;
					n->roles = $3;
					$$ = (Node *)n;
				}
			| DROP ROLE IF_P EXISTS name_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = TRUE;
					n->roles = $5;
					$$ = (Node *)n;
				}
			;

/*****************************************************************************
 *
 * Drop a postgresql DBMS user
 *
 * XXX Ideally this would have CASCADE/RESTRICT options, but since a user
 * might own objects in multiple databases, there is presently no way to
 * implement either cascading or restricting.  Caveat DBA.
 *****************************************************************************/

DropUserStmt:
			DROP USER name_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = FALSE;
					n->roles = $3;
					$$ = (Node *)n;
				}
			| DROP USER IF_P EXISTS name_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->roles = $5;
					n->missing_ok = TRUE;
					$$ = (Node *)n;
				}
			;


/*****************************************************************************
 *
 * Create a postgresql group (role without login ability)
 *
 *****************************************************************************/

CreateGroupStmt:
			CREATE GROUP_P RoleId opt_with OptRoleList
				{
					CreateRoleStmt *n = makeNode(CreateRoleStmt);
					n->stmt_type = ROLESTMT_GROUP;
					n->role = $3;
					n->options = $5;
					$$ = (Node *)n;
				}
		;


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

AlterGroupStmt:
			ALTER GROUP_P RoleId add_drop USER name_list
				{
					AlterRoleStmt *n = makeNode(AlterRoleStmt);
					n->role = $3;
					n->action = $4;
					n->options = list_make1(makeDefElem("rolemembers",
														(Node *)$6));
					$$ = (Node *)n;
				}
		;

add_drop:	ADD_P										{ $$ = +1; }
			| DROP									{ $$ = -1; }
		;


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

DropGroupStmt:
			DROP GROUP_P name_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = FALSE;
					n->roles = $3;
					$$ = (Node *)n;
				}
			| DROP GROUP_P IF_P EXISTS name_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = TRUE;
					n->roles = $5;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 * Manipulate a schema
 *
 *****************************************************************************/

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

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

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

/*
 *	schema_stmt are the ones that can show up inside a CREATE SCHEMA
 *	statement (in addition to by themselves).
 */
schema_stmt:
			CreateStmt
			| IndexStmt
			| CreateSeqStmt
			| CreateTrigStmt
			| GrantStmt
			| ViewStmt
		;


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

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

set_rest:  var_name TO var_list_or_default
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = $1;
					n->args = $3;
					$$ = n;
				}
			| var_name '=' var_list_or_default
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = $1;
					n->args = $3;
					$$ = n;
				}
			| TIME ZONE zone_value
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "timezone";
					if ($3 != NULL)
						n->args = list_make1($3);
					$$ = n;
				}
			| TRANSACTION transaction_mode_list
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "TRANSACTION";
					n->args = $2;
					$$ = n;
				}
			| SESSION CHARACTERISTICS AS TRANSACTION transaction_mode_list
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "SESSION CHARACTERISTICS";
					n->args = $5;
					$$ = n;
				}
			| NAMES opt_encoding
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "client_encoding";
					if ($2 != NULL)
						n->args = list_make1(makeStringConst($2, NULL));
					$$ = n;
				}
			| ROLE ColId_or_Sconst
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "role";
					n->args = list_make1(makeStringConst($2, NULL));
					$$ = n;
				}
			| SESSION AUTHORIZATION ColId_or_Sconst
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "session_authorization";
					n->args = list_make1(makeStringConst($3, NULL));
					$$ = n;
				}
			| SESSION AUTHORIZATION DEFAULT
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->name = "session_authorization";
					n->args = NIL;
					$$ = n;
				}
		;

var_name:
			ColId								{ $$ = $1; }
			| var_name '.' ColId
				{
					int qLen = strlen($1);
					char* qualName = palloc(qLen + strlen($3) + 2);
					strcpy(qualName, $1);
					qualName[qLen] = '.';
					strcpy(qualName + qLen + 1, $3);
					$$ = qualName;
				}
		;

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

var_list:	var_value								{ $$ = list_make1($1); }
			| var_list ',' var_value				{ $$ = lappend($1, $3); }
		;

var_value:	opt_boolean
				{ $$ = makeStringConst($1, NULL); }
			| ColId_or_Sconst
				{ $$ = makeStringConst($1, NULL); }
			| NumericOnly
				{ $$ = makeAConst($1); }
		;

iso_level:	READ UNCOMMITTED						{ $$ = "read uncommitted"; }
			| READ COMMITTED						{ $$ = "read committed"; }
			| REPEATABLE READ						{ $$ = "repeatable read"; }
			| SERIALIZABLE							{ $$ = "serializable"; }
		;

opt_boolean:
			TRUE_P									{ $$ = "true"; }
			| FALSE_P								{ $$ = "false"; }
			| ON									{ $$ = "on"; }
			| OFF									{ $$ = "off"; }
		;

/* Timezone values can be:
 * - a string such as 'pst8pdt'
 * - an identifier such as "pst8pdt"
 * - an integer or floating point number
 * - a time interval per SQL99
 * ColId gives reduce/reduce errors against ConstInterval and LOCAL,
 * so use IDENT and reject anything which is a reserved word.
 */
zone_value:
			Sconst
				{
					$$ = makeStringConst($1, NULL);
				}
			| IDENT
				{
					$$ = makeStringConst($1, NULL);
				}
			| ConstInterval Sconst opt_interval
				{
					A_Const *n = (A_Const *) makeStringConst($2, $1);
					if ($3 != INTERVAL_FULL_RANGE)
					{
						if (($3 & ~(INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE))) != 0)
							ereport(ERROR,
									(errcode(ERRCODE_SYNTAX_ERROR),
									 errmsg("time zone interval must be HOUR or HOUR TO MINUTE")));
						n->typename->typmod = INTERVAL_TYPMOD(INTERVAL_FULL_PRECISION, $3);
					}
					$$ = (Node *)n;
				}
			| ConstInterval '(' Iconst ')' Sconst opt_interval
				{
					A_Const *n = (A_Const *) makeStringConst($5, $1);
					if ($3 < 0)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision must not be negative",
										$3)));
					if ($3 > MAX_INTERVAL_PRECISION)
					{
						ereport(WARNING,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision reduced to maximum allowed, %d",
										$3, MAX_INTERVAL_PRECISION)));
						$3 = MAX_INTERVAL_PRECISION;
					}

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

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

					$$ = (Node *)n;
				}
			| NumericOnly							{ $$ = makeAConst($1); }
			| DEFAULT								{ $$ = NULL; }
			| LOCAL									{ $$ = NULL; }
		;

opt_encoding:
			Sconst									{ $$ = $1; }
			| DEFAULT								{ $$ = NULL; }
			| /*EMPTY*/								{ $$ = NULL; }
		;

ColId_or_Sconst:
			ColId									{ $$ = $1; }
			| SCONST								{ $$ = $1; }
		;


VariableShowStmt:
			SHOW var_name
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name = $2;
					$$ = (Node *) n;
				}
			| SHOW REPLICATION SERVER
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name = "replication_server";
					$$ = (Node *) n;
				}
			| SHOW TIME ZONE
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name = "timezone";
					$$ = (Node *) n;
				}
			| SHOW TRANSACTION ISOLATION LEVEL
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name = "transaction_isolation";
					$$ = (Node *) n;
				}
			| SHOW SESSION AUTHORIZATION
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name = "session_authorization";
					$$ = (Node *) n;
				}
			| SHOW ALL
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name = "all";
					$$ = (Node *) n;
				}
		;

VariableResetStmt:
			RESET var_name
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name = $2;
					$$ = (Node *) n;
				}
			| RESET TIME ZONE
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name = "timezone";
					$$ = (Node *) n;
				}
			| RESET TRANSACTION ISOLATION LEVEL
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name = "transaction_isolation";
					$$ = (Node *) n;
				}
			| RESET SESSION AUTHORIZATION
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name = "session_authorization";
					$$ = (Node *) n;
				}
			| RESET ALL
				{
					VariableResetStmt *n = makeNode(VariableResetStmt);
					n->name = "all";
					$$ = (Node *) n;
				}
		;


ConstraintsSetStmt:
			SET CONSTRAINTS constraints_set_list constraints_set_mode
				{
					ConstraintsSetStmt *n = makeNode(ConstraintsSetStmt);
					n->constraints = $3;
					n->deferred    = $4;
					$$ = (Node *) n;
				}
		;

constraints_set_list:
			ALL										{ $$ = NIL; }
			| qualified_name_list					{ $$ = $1; }
		;

constraints_set_mode:
			DEFERRED								{ $$ = TRUE; }
			| IMMEDIATE								{ $$ = FALSE; }
		;


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


/*****************************************************************************
 *
 *	ALTER [ TABLE | INDEX ] variations
 *
 *****************************************************************************/

AlterTableStmt:
			ALTER TABLE relation_expr alter_table_cmds
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->relation = $3;
					n->cmds = $4;
					n->relkind = OBJECT_TABLE;
					$$ = (Node *)n;
				}
		|	ALTER INDEX relation_expr alter_rel_cmds
				{
					AlterTableStmt *n = makeNode(AlterTableStmt);
					n->relation = $3;
					n->cmds = $4;
					n->relkind = OBJECT_INDEX;
					$$ = (Node *)n;
				}
		;

alter_table_cmds:
			alter_table_cmd							{ $$ = list_make1($1); }
			| alter_table_cmds ',' alter_table_cmd	{ $$ = lappend($1, $3); }
		;

/* Subcommands that are for ALTER TABLE only */
alter_table_cmd:
			/* ALTER TABLE <relation> ADD [COLUMN] <coldef> */
			ADD_P opt_column columnDef
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_AddColumn;
					n->def = $3;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> {SET DEFAULT <expr>|DROP DEFAULT} */
			| ALTER opt_column ColId alter_column_default
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_ColumnDefault;
					n->name = $3;
					n->def = $4;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> DROP NOT NULL */
			| ALTER opt_column ColId DROP NOT NULL_P
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_DropNotNull;
					n->name = $3;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> SET NOT NULL */
			| ALTER opt_column ColId SET NOT NULL_P
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_SetNotNull;
					n->name = $3;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> SET STATISTICS <IntegerOnly> */
			| ALTER opt_column ColId SET STATISTICS IntegerOnly
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_SetStatistics;
					n->name = $3;
					n->def = (Node *) $6;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <relation> ALTER [COLUMN] <colname> SET STORAGE <storagemode> */
			| ALTER opt_column ColId SET STORAGE ColId
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_SetStorage;
					n->name = $3;
					n->def = (Node *) makeString($6);
					$$ = (Node *)n;
				}
			/* ALTER TABLE <relation> DROP [COLUMN] <colname> [RESTRICT|CASCADE] */
			| DROP opt_column ColId opt_drop_behavior
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_DropColumn;
					n->name = $3;
					n->behavior = $4;
					$$ = (Node *)n;
				}
			/*
			 * ALTER TABLE <relation> ALTER [COLUMN] <colname> TYPE <typename>
			 *		[ USING <expression> ]
			 */
			| ALTER opt_column ColId TYPE_P Typename alter_using
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_AlterColumnType;
					n->name = $3;
					n->def = (Node *) $5;
					n->transform = $6;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <relation> ADD CONSTRAINT ... */
			| ADD_P TableConstraint
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_AddConstraint;
					n->def = $2;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <relation> DROP CONSTRAINT <name> [RESTRICT|CASCADE] */
			| DROP CONSTRAINT name opt_drop_behavior
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_DropConstraint;
					n->name = $3;
					n->behavior = $4;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <relation> SET WITHOUT OIDS  */
			| SET WITHOUT OIDS
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_DropOids;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> CLUSTER ON <indexname> */
			| CLUSTER ON name
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_ClusterOn;
					n->name = $3;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> SET WITHOUT CLUSTER */
			| SET WITHOUT CLUSTER
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_DropCluster;
					n->name = NULL;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> ENABLE TRIGGER <trig> */
			| ENABLE_P TRIGGER name
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_EnableTrig;
					n->name = $3;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> ENABLE TRIGGER ALL */
			| ENABLE_P TRIGGER ALL
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_EnableTrigAll;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> ENABLE TRIGGER USER */
			| ENABLE_P TRIGGER USER
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_EnableTrigUser;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> DISABLE TRIGGER <trig> */
			| DISABLE_P TRIGGER name
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_DisableTrig;
					n->name = $3;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> DISABLE TRIGGER ALL */
			| DISABLE_P TRIGGER ALL
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_DisableTrigAll;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> DISABLE TRIGGER USER */
			| DISABLE_P TRIGGER USER
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_DisableTrigUser;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> INHERIT <parent> */
			| INHERIT qualified_name
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_AddInherit;
					n->def = (Node *) $2;
					$$ = (Node *)n;
				}
			/* ALTER TABLE <name> NO INHERIT <parent> */
			| NO INHERIT qualified_name
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_DropInherit;
					n->def = (Node *) $3;
					$$ = (Node *)n;
				}
			| alter_rel_cmd
				{
					$$ = $1;
				}
		;

alter_rel_cmds:
			alter_rel_cmd							{ $$ = list_make1($1); }
			| alter_rel_cmds ',' alter_rel_cmd		{ $$ = lappend($1, $3); }
		;

/* Subcommands that are for ALTER TABLE or ALTER INDEX */
alter_rel_cmd:
			/* ALTER [TABLE|INDEX] <name> OWNER TO RoleId */
			OWNER TO RoleId
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_ChangeOwner;
					n->name = $3;
					$$ = (Node *)n;
				}
			/* ALTER [TABLE|INDEX] <name> SET TABLESPACE <tablespacename> */
			| SET TABLESPACE name
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_SetTableSpace;
					n->name = $3;
					$$ = (Node *)n;
				}
			/* ALTER [TABLE|INDEX] <name> SET (...) */
			| SET definition
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_SetRelOptions;
					n->def = (Node *)$2;
					$$ = (Node *)n;
				}
			/* ALTER [TABLE|INDEX] <name> RESET (...) */
			| RESET definition
				{
					AlterTableCmd *n = makeNode(AlterTableCmd);
					n->subtype = AT_ResetRelOptions;
					n->def = (Node *)$2;
					$$ = (Node *)n;
				}
		;

alter_column_default:
			SET DEFAULT a_expr
				{
					/* Treat SET DEFAULT NULL the same as DROP DEFAULT */
					if (exprIsNullConstant($3))
						$$ = NULL;
					else
						$$ = $3;
				}
			| DROP DEFAULT				{ $$ = NULL; }
		;

opt_drop_behavior:
			CASCADE						{ $$ = DROP_CASCADE; }
			| RESTRICT					{ $$ = DROP_RESTRICT; }
			| /* EMPTY */				{ $$ = DROP_RESTRICT; /* default */ }
		;

alter_using:
			USING a_expr				{ $$ = $2; }
			| /* EMPTY */				{ $$ = NULL; }
		;



/*****************************************************************************
 *
 *		QUERY :
 *				close <portalname>
 *
 *****************************************************************************/

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


/*****************************************************************************
 *
 *		QUERY :
 *				COPY relname ['(' columnList ')'] FROM/TO file [WITH options]
 *
 *				BINARY, OIDS, and DELIMITERS kept in old locations
 *				for backward compatibility.  2002-06-18
 *
 *				COPY ( SELECT ... ) TO file [WITH options]
 *				This form doesn't have the backwards-compatible option
 *				syntax.
 *
 *****************************************************************************/

CopyStmt:	COPY opt_binary qualified_name opt_column_list opt_oids
			copy_from copy_file_name copy_delimiter opt_with copy_opt_list
				{
					CopyStmt *n = makeNode(CopyStmt);
					n->relation = $3;
					n->query = NULL;
					n->attlist = $4;
					n->is_from = $6;
					n->filename = $7;

					n->options = NIL;
					/* Concatenate user-supplied flags */
					if ($2)
						n->options = lappend(n->options, $2);
					if ($5)
						n->options = lappend(n->options, $5);
					if ($8)
						n->options = lappend(n->options, $8);
					if ($10)
						n->options = list_concat(n->options, $10);
					$$ = (Node *)n;
				}
			| COPY select_with_parens TO copy_file_name opt_with
			  copy_opt_list
				{
					CopyStmt *n = makeNode(CopyStmt);
					n->relation = NULL;
					n->query = (Query *) $2;
					n->attlist = NIL;
					n->is_from = false;
					n->filename = $4;
					n->options = $6;
					$$ = (Node *)n;
				}
		;

copy_from:
			FROM									{ $$ = TRUE; }
			| TO									{ $$ = FALSE; }
		;

/*
 * 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; }
		;



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


copy_opt_item:
			BINARY
				{
					$$ = makeDefElem("binary", (Node *)makeInteger(TRUE));
				}
			| OIDS
				{
					$$ = makeDefElem("oids", (Node *)makeInteger(TRUE));
				}
			| DELIMITER opt_as Sconst
				{
					$$ = makeDefElem("delimiter", (Node *)makeString($3));
				}
			| NULL_P opt_as Sconst
				{
					$$ = makeDefElem("null", (Node *)makeString($3));
				}
			| CSV
				{
					$$ = makeDefElem("csv", (Node *)makeInteger(TRUE));
				}
			| HEADER_P
				{
					$$ = makeDefElem("header", (Node *)makeInteger(TRUE));
				}
			| QUOTE opt_as Sconst
				{
					$$ = makeDefElem("quote", (Node *)makeString($3));
				}
			| ESCAPE opt_as Sconst
				{
					$$ = makeDefElem("escape", (Node *)makeString($3));
				}
			| FORCE QUOTE columnList
				{
					$$ = makeDefElem("force_quote", (Node *)$3);
				}
			| FORCE NOT NULL_P columnList
				{
					$$ = makeDefElem("force_notnull", (Node *)$4);
				}
		;

/* The following exist for backward compatibility */

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

opt_oids:
			WITH OIDS
				{
					$$ = makeDefElem("oids", (Node *)makeInteger(TRUE));
				}
			| /*EMPTY*/								{ $$ = NULL; }
		;

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

opt_using:
			USING									{}
			| /*EMPTY*/								{}
		;


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

CreateStmt:	CREATE OptTemp TABLE qualified_name '(' OptTableElementList ')'
			OptInherit OptWith OnCommitOption OptTableSpace
				{
					CreateStmt *n = makeNode(CreateStmt);
					$4->istemp = $2;
					n->relation = $4;
					n->tableElts = $6;
					n->inhRelations = $8;
					n->constraints = NIL;
					n->options = $9;
					n->oncommit = $10;
					n->tablespacename = $11;
					$$ = (Node *)n;
				}
		| CREATE OptTemp TABLE qualified_name OF qualified_name
			'(' OptTableElementList ')' OptWith OnCommitOption OptTableSpace
				{
					/* SQL99 CREATE TABLE OF <UDT> (cols) seems to be satisfied
					 * by our inheritance capabilities. Let's try it...
					 */
					CreateStmt *n = makeNode(CreateStmt);
					$4->istemp = $2;
					n->relation = $4;
					n->tableElts = $8;
					n->inhRelations = list_make1($6);
					n->constraints = NIL;
					n->options = $10;
					n->oncommit = $11;
					n->tablespacename = $12;
					$$ = (Node *)n;
				}
		;

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

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

TableElementList:
			TableElement
				{
					$$ = list_make1($1);
				}
			| TableElementList ',' TableElement
				{
					$$ = lappend($1, $3);
				}
		;

TableElement:
			columnDef							{ $$ = $1; }
			| TableLikeClause					{ $$ = $1; }
			| TableConstraint					{ $$ = $1; }
		;

columnDef:	ColId Typename ColQualList
				{
					ColumnDef *n = makeNode(ColumnDef);
					n->colname = $1;
					n->typename = $2;
					n->constraints = $3;
					n->is_local = true;
					$$ = (Node *)n;
				}
		;

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

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

/* DEFAULT NULL is already the default for Postgres.
 * But define it here and carry it forward into the system
 * to make it explicit.
 * - thomas 1998-09-13
 *
 * WITH NULL and NULL are not SQL92-standard syntax elements,
 * so leave them out. Use DEFAULT NULL to explicitly indicate
 * that a column may have that value. WITH NULL leads to
 * shift/reduce conflicts with WITH TIME ZONE anyway.
 * - thomas 1999-01-08
 *
 * DEFAULT expression must be b_expr not a_expr to prevent shift/reduce
 * conflict on NOT (since NOT might start a subsequent NOT NULL constraint,
 * or be part of a_expr NOT LIKE or similar constructs).
 */
ColConstraintElem:
			NOT NULL_P
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_NOTNULL;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = NULL;
					n->indexspace = NULL;
					$$ = (Node *)n;
				}
			| NULL_P
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_NULL;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = NULL;
					n->indexspace = NULL;
					$$ = (Node *)n;
				}
			| UNIQUE opt_definition OptConsTableSpace
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_UNIQUE;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = NULL;
					n->options = $2;
					n->indexspace = $3;
					$$ = (Node *)n;
				}
			| PRIMARY KEY opt_definition OptConsTableSpace
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_PRIMARY;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = NULL;
					n->options = $3;
					n->indexspace = $4;
					$$ = (Node *)n;
				}
			| CHECK '(' a_expr ')'
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_CHECK;
					n->name = NULL;
					n->raw_expr = $3;
					n->cooked_expr = NULL;
					n->keys = NULL;
					n->indexspace = NULL;
					$$ = (Node *)n;
				}
			| DEFAULT b_expr
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_DEFAULT;
					n->name = NULL;
					if (exprIsNullConstant($2))
					{
						/* DEFAULT NULL should be reported as empty expr */
						n->raw_expr = NULL;
					}
					else
					{
						n->raw_expr = $2;
					}
					n->cooked_expr = NULL;
					n->keys = NULL;
					n->indexspace = NULL;
					$$ = (Node *)n;
				}
			| REFERENCES qualified_name opt_column_list key_match key_actions
				{
					FkConstraint *n = makeNode(FkConstraint);
					n->constr_name		= NULL;
					n->pktable			= $2;
					n->fk_attrs			= NIL;
					n->pk_attrs			= $3;
					n->fk_matchtype		= $4;
					n->fk_upd_action	= (char) ($5 >> 8);
					n->fk_del_action	= (char) ($5 & 0xFF);
					n->deferrable		= FALSE;
					n->initdeferred		= FALSE;
					$$ = (Node *)n;
				}
		;

/*
 * ConstraintAttr represents constraint attributes, which we parse as if
 * they were independent constraint clauses, in order to avoid shift/reduce
 * conflicts (since NOT might start either an independent NOT NULL clause
 * or an attribute).  analyze.c is responsible for attaching the attribute
 * information to the preceding "real" constraint node, and for complaining
 * if attribute clauses appear in the wrong place or wrong combinations.
 *
 * See also ConstraintAttributeSpec, which can be used in places where
 * there is no parsing conflict.
 */
ConstraintAttr:
			DEFERRABLE
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_ATTR_DEFERRABLE;
					$$ = (Node *)n;
				}
			| NOT DEFERRABLE
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_ATTR_NOT_DEFERRABLE;
					$$ = (Node *)n;
				}
			| INITIALLY DEFERRED
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_ATTR_DEFERRED;
					$$ = (Node *)n;
				}
			| INITIALLY IMMEDIATE
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_ATTR_IMMEDIATE;
					$$ = (Node *)n;
				}
		;


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

TableLikeOptionList:
				TableLikeOptionList TableLikeOption	{ $$ = lappend_int($1, $2); }
				| /* EMPTY */						{ $$ = NIL; }
		;

TableLikeOption:
				INCLUDING DEFAULTS					{ $$ = 	CREATE_TABLE_LIKE_INCLUDING_DEFAULTS; }
				| EXCLUDING DEFAULTS				{ $$ = 	CREATE_TABLE_LIKE_EXCLUDING_DEFAULTS; }
				| INCLUDING CONSTRAINTS				{ $$ = 	CREATE_TABLE_LIKE_INCLUDING_CONSTRAINTS; }
				| EXCLUDING CONSTRAINTS				{ $$ = 	CREATE_TABLE_LIKE_EXCLUDING_CONSTRAINTS; }
				| INCLUDING INDEXES					{ $$ = 	CREATE_TABLE_LIKE_INCLUDING_INDEXES; }
				| EXCLUDING INDEXES					{ $$ = 	CREATE_TABLE_LIKE_EXCLUDING_INDEXES; }
		;


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

ConstraintElem:
			CHECK '(' a_expr ')'
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_CHECK;
					n->name = NULL;
					n->raw_expr = $3;
					n->cooked_expr = NULL;
					n->indexspace = NULL;
					$$ = (Node *)n;
				}
			| UNIQUE '(' columnList ')' opt_definition OptConsTableSpace
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_UNIQUE;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = $3;
					n->options = $5;
					n->indexspace = $6;
					$$ = (Node *)n;
				}
			| PRIMARY KEY '(' columnList ')' opt_definition OptConsTableSpace
				{
					Constraint *n = makeNode(Constraint);
					n->contype = CONSTR_PRIMARY;
					n->name = NULL;
					n->raw_expr = NULL;
					n->cooked_expr = NULL;
					n->keys = $4;
					n->options = $6;
					n->indexspace = $7;
					$$ = (Node *)n;
				}
			| FOREIGN KEY '(' columnList ')' REFERENCES qualified_name
				opt_column_list key_match key_actions ConstraintAttributeSpec
				{
					FkConstraint *n = makeNode(FkConstraint);
					n->constr_name		= NULL;
					n->pktable			= $7;
					n->fk_attrs			= $4;
					n->pk_attrs			= $8;
					n->fk_matchtype		= $9;
					n->fk_upd_action	= (char) ($10 >> 8);
					n->fk_del_action	= (char) ($10 & 0xFF);
					n->deferrable		= ($11 & 1) != 0;
					n->initdeferred		= ($11 & 2) != 0;
					$$ = (Node *)n;
				}
		;

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

columnList:
			columnElem								{ $$ = list_make1($1); }
			| columnList ',' columnElem				{ $$ = lappend($1, $3); }
		;

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

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

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

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

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

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

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

/* WITH (options) is preferred, WITH OIDS and WITHOUT OIDS are legacy forms */
OptWith:
			WITH definition				{ $$ = $2; }
			| WITH OIDS					{ $$ = list_make1(defWithOids(true)); }
			| WITHOUT OIDS				{ $$ = list_make1(defWithOids(false)); }
			| /*EMPTY*/					{ $$ = NIL; }
		;

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

OptTableSpace:   TABLESPACE name					{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NULL; }
		;

OptConsTableSpace:   USING INDEX TABLESPACE name	{ $$ = $4; }
			| /*EMPTY*/								{ $$ = NULL; }
		;


/*
 * Note: CREATE TABLE ... AS SELECT ... is just another spelling for
 * SELECT ... INTO.
 */

CreateAsStmt:
		CREATE OptTemp TABLE qualified_name OptCreateAs
			OptWith OnCommitOption OptTableSpace AS SelectStmt
				{
					/*
					 * When the SelectStmt is a set-operation tree, we must
					 * stuff the INTO information into the leftmost component
					 * Select, because that's where analyze.c will expect
					 * to find it.	Similarly, the output column names must
					 * be attached to that Select's target list.
					 */
					SelectStmt *n = findLeftmostSelect((SelectStmt *) $10);
					if (n->into != NULL)
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("CREATE TABLE AS may not specify INTO")));
					$4->istemp = $2;
					n->into = $4;
					n->intoColNames = $5;
					n->intoOptions = $6;
					n->intoOnCommit = $7;
					n->intoTableSpaceName = $8;
					$$ = $10;
				}
		;

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

CreateAsList:
			CreateAsElement							{ $$ = list_make1($1); }
			| CreateAsList ',' CreateAsElement		{ $$ = lappend($1, $3); }
		;

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


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

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

AlterSeqStmt:
			ALTER SEQUENCE qualified_name OptSeqList
				{
					AlterSeqStmt *n = makeNode(AlterSeqStmt);
					n->sequence = $3;
					n->options = $4;
					$$ = (Node *)n;
				}
		;

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

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

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

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

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

IntegerOnly: SignedIconst							{ $$ = makeInteger($1); };


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

CreatePLangStmt:
			CREATE opt_trusted opt_procedural LANGUAGE ColId_or_Sconst
			{
				CreatePLangStmt *n = makeNode(CreatePLangStmt);
				n->plname = $5;
				/* parameters are all to be supplied by system */
				n->plhandler = NIL;
				n->plvalidator = NIL;
				n->pltrusted = false;
				$$ = (Node *)n;
			}
			| CREATE opt_trusted opt_procedural LANGUAGE ColId_or_Sconst
			  HANDLER handler_name opt_validator opt_lancompiler
			{
				CreatePLangStmt *n = makeNode(CreatePLangStmt);
				n->plname = $5;
				n->plhandler = $7;
				n->plvalidator = $8;
				n->pltrusted = $2;
				/* LANCOMPILER is now ignored entirely */
				$$ = (Node *)n;
			}
		;

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

/* This ought to be just func_name, but that causes reduce/reduce conflicts
 * (CREATE LANGUAGE is the only place where func_name isn't followed by '(').
 * Work around by using simple names, instead.
 */
handler_name:
			name						{ $$ = list_make1(makeString($1)); }
			| name attrs				{ $$ = lcons(makeString($1), $2); }
		;

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

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

DropPLangStmt:
			DROP opt_procedural LANGUAGE ColId_or_Sconst opt_drop_behavior
				{
					DropPLangStmt *n = makeNode(DropPLangStmt);
					n->plname = $4;
					n->behavior = $5;
					n->missing_ok = false;
					$$ = (Node *)n;
				}
			| DROP opt_procedural LANGUAGE IF_P EXISTS ColId_or_Sconst opt_drop_behavior
				{
					DropPLangStmt *n = makeNode(DropPLangStmt);
					n->plname = $6;
					n->behavior = $7;
					n->missing_ok = true;
					$$ = (Node *)n;
				}
		;

opt_procedural:
			PROCEDURAL								{}
			| /*EMPTY*/								{}
		;

/*****************************************************************************
 *
 * 		QUERY:
 *             CREATE TABLESPACE tablespace LOCATION '/path/to/tablespace/'
 *
 *****************************************************************************/

CreateTableSpaceStmt: CREATE TABLESPACE name OptTableSpaceOwner LOCATION Sconst
				{
					CreateTableSpaceStmt *n = makeNode(CreateTableSpaceStmt);
					n->tablespacename = $3;
					n->owner = $4;
					n->location = $6;
					$$ = (Node *) n;
				}
		;

OptTableSpaceOwner: OWNER name			{ $$ = $2; }
			| /*EMPTY */				{ $$ = NULL; }
		;

/*****************************************************************************
 *
 * 		QUERY :
 *				DROP TABLESPACE <tablespace>
 *
 *		No need for drop behaviour as we cannot implement dependencies for
 *		objects in other databases; we can only support RESTRICT.
 *
 ****************************************************************************/

DropTableSpaceStmt: DROP TABLESPACE name
				{
					DropTableSpaceStmt *n = makeNode(DropTableSpaceStmt);
					n->tablespacename = $3;
					n->missing_ok = false;
					$$ = (Node *) n;
				}
				|  DROP TABLESPACE IF_P EXISTS name
                {
					DropTableSpaceStmt *n = makeNode(DropTableSpaceStmt);
					n->tablespacename = $5;
					n->missing_ok = true;
					$$ = (Node *) n;
				}
		;

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

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

					n->constrrel = $9;
					$$ = (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									{ $$ = 'i'; }
			| DELETE_P								{ $$ = 'd'; }
			| UPDATE								{ $$ = 'u'; }
		;

TriggerForSpec:
			FOR TriggerForOpt TriggerForType
				{
					$$ = $3;
				}
			| /* EMPTY */
				{
					/*
					 * If ROW/STATEMENT not specified, default to
					 * STATEMENT, per SQL
					 */
					$$ = FALSE;
				}
		;

TriggerForOpt:
			EACH									{}
			| /*EMPTY*/								{}
		;

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

TriggerFuncArgs:
			TriggerFuncArg							{ $$ = list_make1($1); }
			| TriggerFuncArgs ',' TriggerFuncArg	{ $$ = lappend($1, $3); }
			| /*EMPTY*/								{ $$ = NIL; }
		;

TriggerFuncArg:
			ICONST
				{
					char buf[64];
					snprintf(buf, sizeof(buf), "%d", $1);
					$$ = makeString(pstrdup(buf));
				}
			| FCONST								{ $$ = makeString($1); }
			| Sconst								{ $$ = makeString($1); }
			| BCONST								{ $$ = makeString($1); }
			| XCONST								{ $$ = makeString($1); }
			| ColId									{ $$ = makeString($1); }
		;

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

ConstraintAttributeSpec:
			ConstraintDeferrabilitySpec
				{ $$ = $1; }
			| ConstraintDeferrabilitySpec ConstraintTimeSpec
				{
					if ($1 == 0 && $2 != 0)
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE")));
					$$ = $1 | $2;
				}
			| ConstraintTimeSpec
				{
					if ($1 != 0)
						$$ = 3;
					else
						$$ = 0;
				}
			| ConstraintTimeSpec ConstraintDeferrabilitySpec
				{
					if ($2 == 0 && $1 != 0)
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE")));
					$$ = $1 | $2;
				}
			| /*EMPTY*/
				{ $$ = 0; }
		;

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

ConstraintTimeSpec:
			INITIALLY IMMEDIATE						{ $$ = 0; }
			| INITIALLY DEFERRED					{ $$ = 2; }
		;


DropTrigStmt:
			DROP TRIGGER name ON qualified_name opt_drop_behavior
				{
					DropPropertyStmt *n = makeNode(DropPropertyStmt);
					n->relation = $5;
					n->property = $3;
					n->behavior = $6;
					n->removeType = OBJECT_TRIGGER;
					n->missing_ok = false;
					$$ = (Node *) n;
				}
			| DROP TRIGGER IF_P EXISTS name ON qualified_name opt_drop_behavior
				{
					DropPropertyStmt *n = makeNode(DropPropertyStmt);
					n->relation = $7;
					n->property = $5;
					n->behavior = $8;
					n->removeType = OBJECT_TRIGGER;
					n->missing_ok = true;
					$$ = (Node *) n;
				}
		;


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

CreateAssertStmt:
			CREATE ASSERTION name CHECK '(' a_expr ')'
			ConstraintAttributeSpec
				{
					CreateTrigStmt *n = makeNode(CreateTrigStmt);
					n->trigname = $3;
					n->args = list_make1($6);
					n->isconstraint  = TRUE;
					n->deferrable = ($8 & 1) != 0;
					n->initdeferred = ($8 & 2) != 0;

					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("CREATE ASSERTION is not yet implemented")));

					$$ = (Node *)n;
				}
		;

DropAssertStmt:
			DROP ASSERTION name opt_drop_behavior
				{
					DropPropertyStmt *n = makeNode(DropPropertyStmt);
					n->relation = NULL;
					n->property = $3;
					n->behavior = $4;
					n->removeType = OBJECT_TRIGGER; /* XXX */
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("DROP ASSERTION is not yet implemented")));
					$$ = (Node *) n;
				}
		;


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

DefineStmt:
			CREATE AGGREGATE func_name aggr_args definition
				{
					DefineStmt *n = makeNode(DefineStmt);
					n->kind = OBJECT_AGGREGATE;
					n->oldstyle = false;
					n->defnames = $3;
					n->args = $4;
					n->definition = $5;
					$$ = (Node *)n;
				}
			| CREATE AGGREGATE func_name old_aggr_definition
				{
					/* old-style (pre-8.2) syntax for CREATE AGGREGATE */
					DefineStmt *n = makeNode(DefineStmt);
					n->kind = OBJECT_AGGREGATE;
					n->oldstyle = true;
					n->defnames = $3;
					n->args = NIL;
					n->definition = $4;
					$$ = (Node *)n;
				}
			| CREATE OPERATOR any_operator definition
				{
					DefineStmt *n = makeNode(DefineStmt);
					n->kind = OBJECT_OPERATOR;
					n->oldstyle = false;
					n->defnames = $3;
					n->args = NIL;
					n->definition = $4;
					$$ = (Node *)n;
				}
			| CREATE TYPE_P any_name definition
				{
					DefineStmt *n = makeNode(DefineStmt);
					n->kind = OBJECT_TYPE;
					n->oldstyle = false;
					n->defnames = $3;
					n->args = NIL;
					n->definition = $4;
					$$ = (Node *)n;
				}
			| CREATE TYPE_P any_name 
				{
					/* Shell type (identified by lack of definition) */
					DefineStmt *n = makeNode(DefineStmt);
					n->kind = OBJECT_TYPE;
					n->oldstyle = false;
					n->defnames = $3;
					n->args = NIL;
					n->definition = NIL;
					$$ = (Node *)n;
				}
			| CREATE TYPE_P any_name AS '(' TableFuncElementList ')'
				{
					CompositeTypeStmt *n = makeNode(CompositeTypeStmt);
					RangeVar *r = makeNode(RangeVar);

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

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

def_list:  	def_elem								{ $$ = list_make1($1); }
			| def_list ',' def_elem					{ $$ = lappend($1, $3); }
		;

def_elem:  ColLabel '=' def_arg
				{
					$$ = makeDefElem($1, (Node *)$3);
				}
			| ColLabel
				{
					$$ = makeDefElem($1, NULL);
				}
		;

/* Note: any simple identifier will be returned as a type name! */
def_arg:	func_type						{ $$ = (Node *)$1; }
			| func_name_keyword				{ $$ = (Node *)makeString(pstrdup($1)); }
			| reserved_keyword				{ $$ = (Node *)makeString(pstrdup($1)); }
			| qual_all_Op					{ $$ = (Node *)$1; }
			| NumericOnly					{ $$ = (Node *)$1; }
			| Sconst						{ $$ = (Node *)makeString($1); }
		;

aggr_args:	'(' aggr_args_list ')'					{ $$ = $2; }
			| '(' '*' ')'							{ $$ = NIL; }
		;

aggr_args_list:
			Typename								{ $$ = list_make1($1); }
			| aggr_args_list ',' Typename			{ $$ = lappend($1, $3); }
		;

old_aggr_definition: '(' old_aggr_list ')'			{ $$ = $2; }
		;

old_aggr_list: old_aggr_elem						{ $$ = list_make1($1); }
			| old_aggr_list ',' old_aggr_elem		{ $$ = lappend($1, $3); }
		;

old_aggr_elem:  IDENT '=' def_arg
				{
					$$ = makeDefElem($1, (Node *)$3);
				}
		;


/*****************************************************************************
 *
 *		QUERIES :
 *				CREATE OPERATOR CLASS ...
 *				DROP OPERATOR CLASS ...
 *
 *****************************************************************************/

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

opclass_item_list:
			opclass_item							{ $$ = list_make1($1); }
			| opclass_item_list ',' opclass_item	{ $$ = lappend($1, $3); }
		;

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

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

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


DropOpClassStmt:
			DROP OPERATOR CLASS any_name USING access_method opt_drop_behavior
				{
					RemoveOpClassStmt *n = makeNode(RemoveOpClassStmt);
					n->opclassname = $4;
					n->amname = $6;
					n->behavior = $7;
					n->missing_ok = false;
					$$ = (Node *) n;
				}
			| DROP OPERATOR CLASS IF_P EXISTS any_name USING access_method opt_drop_behavior
				{
					RemoveOpClassStmt *n = makeNode(RemoveOpClassStmt);
					n->opclassname = $6;
					n->amname = $8;
					n->behavior = $9;
					n->missing_ok = true;
					$$ = (Node *) n;
				}
		;

/*****************************************************************************
 *
 *		QUERY:
 *
 *		DROP OWNED BY username [, username ...] [ RESTRICT | CASCADE ]
 *		REASSIGN OWNED BY username [, username ...] TO username
 *
 *****************************************************************************/
DropOwnedStmt:
			DROP OWNED BY name_list opt_drop_behavior
			 	{
					DropOwnedStmt *n = makeNode(DropOwnedStmt);
					n->roles = $4;
					n->behavior = $5;
					$$ = (Node *)n;
				}
		;

ReassignOwnedStmt:
			REASSIGN OWNED BY name_list TO name
				{
					ReassignOwnedStmt *n = makeNode(ReassignOwnedStmt);
					n->roles = $4;
					n->newrole = $6;
					$$ = (Node *)n;
				}
		;

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

DropStmt:	DROP drop_type IF_P EXISTS any_name_list opt_drop_behavior
				{
					DropStmt *n = makeNode(DropStmt);
					n->removeType = $2;
					n->missing_ok = TRUE;
					n->objects = $5;
					n->behavior = $6;
					$$ = (Node *)n;
				}
			| DROP drop_type any_name_list opt_drop_behavior
				{
					DropStmt *n = makeNode(DropStmt);
					n->removeType = $2;
					n->missing_ok = FALSE;
					n->objects = $3;
					n->behavior = $4;
					$$ = (Node *)n;
				}
		;


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

any_name_list:
			any_name								{ $$ = list_make1($1); }
			| any_name_list ',' any_name			{ $$ = lappend($1, $3); }
		;

any_name:	ColId						{ $$ = list_make1(makeString($1)); }
			| ColId attrs				{ $$ = lcons(makeString($1), $2); }
		;

attrs:		'.' attr_name
					{ $$ = list_make1(makeString($2)); }
			| attrs '.' attr_name
					{ $$ = lappend($1, makeString($3)); }
		;


/*****************************************************************************
 *
 *		QUERY:
 *				truncate table relname1, relname2, ...
 *
 *****************************************************************************/

TruncateStmt:
			TRUNCATE opt_table qualified_name_list opt_drop_behavior
				{
					TruncateStmt *n = makeNode(TruncateStmt);
					n->relations = $3;
					n->behavior = $4;
					$$ = (Node *)n;
				}
		;

/*****************************************************************************
 *
 *	The COMMENT ON statement can take different forms based upon the type of
 *	the object associated with the comment. The form of the statement is:
 *
 *	COMMENT ON [ [ DATABASE | DOMAIN | INDEX | SEQUENCE | TABLE | TYPE | VIEW |
 *				   CONVERSION | LANGUAGE | OPERATOR CLASS | LARGE OBJECT |
 *				   CAST | COLUMN | SCHEMA | TABLESPACE | ROLE ] <objname> |
 *				 AGGREGATE <aggname> (arg1, ...) |
 *				 FUNCTION <funcname> (arg1, arg2, ...) |
 *				 OPERATOR <op> (leftoperand_typ, rightoperand_typ) |
 *				 TRIGGER <triggername> ON <relname> |
 *				 CONSTRAINT <constraintname> ON <relname> |
 *				 RULE <rulename> ON <relname> ]
 *			   IS 'text'
 *
 *****************************************************************************/

CommentStmt:
			COMMENT ON comment_type any_name IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = $3;
					n->objname = $4;
					n->objargs = NIL;
					n->comment = $6;
					$$ = (Node *) n;
				}
			| COMMENT ON AGGREGATE func_name aggr_args IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_AGGREGATE;
					n->objname = $4;
					n->objargs = $5;
					n->comment = $7;
					$$ = (Node *) n;
				}
			| COMMENT ON FUNCTION func_name func_args IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_FUNCTION;
					n->objname = $4;
					n->objargs = extractArgTypes($5);
					n->comment = $7;
					$$ = (Node *) n;
				}
			| COMMENT ON OPERATOR any_operator '(' oper_argtypes ')'
			IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_OPERATOR;
					n->objname = $4;
					n->objargs = $6;
					n->comment = $9;
					$$ = (Node *) n;
				}
			| COMMENT ON CONSTRAINT name ON any_name IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_CONSTRAINT;
					n->objname = lappend($6, makeString($4));
					n->objargs = NIL;
					n->comment = $8;
					$$ = (Node *) n;
				}
			| COMMENT ON RULE name ON any_name IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_RULE;
					n->objname = lappend($6, makeString($4));
					n->objargs = NIL;
					n->comment = $8;
					$$ = (Node *) n;
				}
			| COMMENT ON RULE name IS comment_text
				{
					/* Obsolete syntax supported for awhile for compatibility */
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_RULE;
					n->objname = list_make1(makeString($4));
					n->objargs = NIL;
					n->comment = $6;
					$$ = (Node *) n;
				}
			| COMMENT ON TRIGGER name ON any_name IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_TRIGGER;
					n->objname = lappend($6, makeString($4));
					n->objargs = NIL;
					n->comment = $8;
					$$ = (Node *) n;
				}
			| COMMENT ON OPERATOR CLASS any_name USING access_method IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_OPCLASS;
					n->objname = $5;
					n->objargs = list_make1(makeString($7));
					n->comment = $9;
					$$ = (Node *) n;
				}
			| COMMENT ON LARGE_P OBJECT_P NumericOnly IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_LARGEOBJECT;
					n->objname = list_make1($5);
					n->objargs = NIL;
					n->comment = $7;
					$$ = (Node *) n;
				}
			| COMMENT ON CAST '(' Typename AS Typename ')' IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_CAST;
					n->objname = list_make1($5);
					n->objargs = list_make1($7);
					n->comment = $10;
					$$ = (Node *) n;
				}
			| COMMENT ON opt_procedural LANGUAGE any_name IS comment_text
				{
					CommentStmt *n = makeNode(CommentStmt);
					n->objtype = OBJECT_LANGUAGE;
					n->objname = $5;
					n->objargs = NIL;
					n->comment = $7;
					$$ = (Node *) n;
				}
		;

comment_type:
			COLUMN								{ $$ = OBJECT_COLUMN; }
			| DATABASE							{ $$ = OBJECT_DATABASE; }
			| SCHEMA							{ $$ = OBJECT_SCHEMA; }
			| INDEX								{ $$ = OBJECT_INDEX; }
			| SEQUENCE							{ $$ = OBJECT_SEQUENCE; }
			| TABLE								{ $$ = OBJECT_TABLE; }
			| DOMAIN_P							{ $$ = OBJECT_TYPE; }
			| TYPE_P							{ $$ = OBJECT_TYPE; }
			| VIEW								{ $$ = OBJECT_VIEW; }
			| CONVERSION_P						{ $$ = OBJECT_CONVERSION; }
			| TABLESPACE						{ $$ = OBJECT_TABLESPACE; }
			| ROLE								{ $$ = OBJECT_ROLE; }
		;

comment_text:
			Sconst								{ $$ = $1; }
			| NULL_P							{ $$ = NULL; }
		;

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

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

fetch_direction:
			/*EMPTY*/
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = 1;
					$$ = (Node *)n;
				}
			| NEXT
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = 1;
					$$ = (Node *)n;
				}
			| PRIOR
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_BACKWARD;
					n->howMany = 1;
					$$ = (Node *)n;
				}
			| FIRST_P
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_ABSOLUTE;
					n->howMany = 1;
					$$ = (Node *)n;
				}
			| LAST_P
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_ABSOLUTE;
					n->howMany = -1;
					$$ = (Node *)n;
				}
			| ABSOLUTE_P SignedIconst
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_ABSOLUTE;
					n->howMany = $2;
					$$ = (Node *)n;
				}
			| RELATIVE_P SignedIconst
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_RELATIVE;
					n->howMany = $2;
					$$ = (Node *)n;
				}
			| SignedIconst
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = $1;
					$$ = (Node *)n;
				}
			| ALL
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = FETCH_ALL;
					$$ = (Node *)n;
				}
			| FORWARD
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = 1;
					$$ = (Node *)n;
				}
			| FORWARD SignedIconst
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = $2;
					$$ = (Node *)n;
				}
			| FORWARD ALL
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_FORWARD;
					n->howMany = FETCH_ALL;
					$$ = (Node *)n;
				}
			| BACKWARD
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_BACKWARD;
					n->howMany = 1;
					$$ = (Node *)n;
				}
			| BACKWARD SignedIconst
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_BACKWARD;
					n->howMany = $2;
					$$ = (Node *)n;
				}
			| BACKWARD ALL
				{
					FetchStmt *n = makeNode(FetchStmt);
					n->direction = FETCH_BACKWARD;
					n->howMany = FETCH_ALL;
					$$ = (Node *)n;
				}
		;

from_in:	FROM									{}
			| IN_P									{}
		;


/*****************************************************************************
 *
 * GRANT and REVOKE statements
 *
 *****************************************************************************/

GrantStmt:	GRANT privileges ON privilege_target TO grantee_list
			opt_grant_grant_option
				{
					GrantStmt *n = makeNode(GrantStmt);
					n->is_grant = true;
					n->privileges = $2;
					n->objtype = ($4)->objtype;
					n->objects = ($4)->objs;
					n->grantees = $6;
					n->grant_option = $7;
					$$ = (Node*)n;
				}
		;

RevokeStmt:
			REVOKE privileges ON privilege_target
			FROM grantee_list opt_drop_behavior
				{
					GrantStmt *n = makeNode(GrantStmt);
					n->is_grant = false;
					n->grant_option = false;
					n->privileges = $2;
					n->objtype = ($4)->objtype;
					n->objects = ($4)->objs;
					n->grantees = $6;
					n->behavior = $7;
					$$ = (Node *)n;
				}
			| REVOKE GRANT OPTION FOR privileges ON privilege_target
			FROM grantee_list opt_drop_behavior
				{
					GrantStmt *n = makeNode(GrantStmt);
					n->is_grant = false;
					n->grant_option = true;
					n->privileges = $5;
					n->objtype = ($7)->objtype;
					n->objects = ($7)->objs;
					n->grantees = $9;
					n->behavior = $10;
					$$ = (Node *)n;
				}
		;


/*
 * A privilege list is represented as a list of strings; the validity of
 * the privilege names gets checked at execution.  This is a bit annoying
 * but we have little choice because of the syntactic conflict with lists
 * of role names in GRANT/REVOKE.  What's more, we have to call out in
 * the "privilege" production any reserved keywords that need to be usable
 * as privilege names.
 */

/* either ALL [PRIVILEGES] or a list of individual privileges */
privileges: privilege_list
				{ $$ = $1; }
			| ALL
				{ $$ = NIL; }
			| ALL PRIVILEGES
				{ $$ = NIL; }
		;

privilege_list:	privilege
					{ $$ = list_make1(makeString($1)); }
			| privilege_list ',' privilege
					{ $$ = lappend($1, makeString($3)); }
		;

privilege:	SELECT									{ $$ = pstrdup($1); }
			| REFERENCES							{ $$ = pstrdup($1); }
			| CREATE								{ $$ = pstrdup($1); }
			| ColId									{ $$ = $1; }
		;


/* Don't bother trying to fold the first two rules into one using
 * opt_table.  You're going to get conflicts.
 */
privilege_target:
			qualified_name_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_RELATION;
					n->objs = $1;
					$$ = n;
				}
			| TABLE qualified_name_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_RELATION;
					n->objs = $2;
					$$ = n;
				}
			| SEQUENCE qualified_name_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_SEQUENCE;
					n->objs = $2;
					$$ = n;
				}
			| FUNCTION function_with_argtypes_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_FUNCTION;
					n->objs = $2;
					$$ = n;
				}
			| DATABASE name_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_DATABASE;
					n->objs = $2;
					$$ = n;
				}
			| LANGUAGE name_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_LANGUAGE;
					n->objs = $2;
					$$ = n;
				}
			| SCHEMA name_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_NAMESPACE;
					n->objs = $2;
					$$ = n;
				}
			| TABLESPACE name_list
				{
					PrivTarget *n = makeNode(PrivTarget);
					n->objtype = ACL_OBJECT_TABLESPACE;
					n->objs = $2;
					$$ = n;
				}
		;


grantee_list:
			grantee									{ $$ = list_make1($1); }
			| grantee_list ',' grantee				{ $$ = lappend($1, $3); }
		;

grantee:	RoleId
				{
					PrivGrantee *n = makeNode(PrivGrantee);
					/* This hack lets us avoid reserving PUBLIC as a keyword*/
					if (strcmp($1, "public") == 0)
						n->rolname = NULL;
					else
						n->rolname = $1;
					$$ = (Node *)n;
				}
			| GROUP_P RoleId
				{
					PrivGrantee *n = makeNode(PrivGrantee);
					/* Treat GROUP PUBLIC as a synonym for PUBLIC */
					if (strcmp($2, "public") == 0)
						n->rolname = NULL;
					else
						n->rolname = $2;
					$$ = (Node *)n;
				}
		;


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

function_with_argtypes_list:
			function_with_argtypes					{ $$ = list_make1($1); }
			| function_with_argtypes_list ',' function_with_argtypes
													{ $$ = lappend($1, $3); }
		;

function_with_argtypes:
			func_name func_args
				{
					FuncWithArgs *n = makeNode(FuncWithArgs);
					n->funcname = $1;
					n->funcargs = extractArgTypes($2);
					$$ = n;
				}
		;

/*****************************************************************************
 *
 * GRANT and REVOKE ROLE statements
 *
 *****************************************************************************/

GrantRoleStmt:
			GRANT privilege_list TO name_list opt_grant_admin_option opt_granted_by
				{
					GrantRoleStmt *n = makeNode(GrantRoleStmt);
					n->is_grant = true;
					n->granted_roles = $2;
					n->grantee_roles = $4;
					n->admin_opt = $5;
					n->grantor = $6;
					$$ = (Node*)n;
				}
		;

RevokeRoleStmt:
			REVOKE privilege_list FROM name_list opt_granted_by opt_drop_behavior
				{
					GrantRoleStmt *n = makeNode(GrantRoleStmt);
					n->is_grant = false;
					n->admin_opt = false;
					n->granted_roles = $2;
					n->grantee_roles = $4;
					n->behavior = $6;
					$$ = (Node*)n;
				}
			| REVOKE ADMIN OPTION FOR privilege_list FROM name_list opt_granted_by opt_drop_behavior
				{
					GrantRoleStmt *n = makeNode(GrantRoleStmt);
					n->is_grant = false;
					n->admin_opt = true;
					n->granted_roles = $5;
					n->grantee_roles = $7;
					n->behavior = $9;
					$$ = (Node*)n;
				}
		;

opt_grant_admin_option: WITH ADMIN OPTION				{ $$ = TRUE; }
			| /*EMPTY*/									{ $$ = FALSE; }
		;

opt_granted_by: GRANTED BY RoleId						{ $$ = $3; }
			| /*EMPTY*/									{ $$ = NULL; }
		;


/*****************************************************************************
 *
 *		QUERY: CREATE INDEX
 *
 * Note: we can't factor CONCURRENTLY into a separate production without
 * making it a reserved word.
 *
 * Note: we cannot put TABLESPACE clause after WHERE clause unless we are
 * willing to make TABLESPACE a fully reserved word.
 *****************************************************************************/

IndexStmt:	CREATE index_opt_unique INDEX index_name
			ON qualified_name access_method_clause '(' index_params ')'
			opt_definition OptTableSpace where_clause
				{
					IndexStmt *n = makeNode(IndexStmt);
					n->unique = $2;
					n->concurrent = false;
					n->idxname = $4;
					n->relation = $6;
					n->accessMethod = $7;
					n->indexParams = $9;
					n->options = $11;
					n->tableSpace = $12;
					n->whereClause = $13;
					$$ = (Node *)n;
				}
			| CREATE index_opt_unique INDEX CONCURRENTLY index_name
			ON qualified_name access_method_clause '(' index_params ')'
			opt_definition OptTableSpace where_clause
				{
					IndexStmt *n = makeNode(IndexStmt);
					n->unique = $2;
					n->concurrent = true;
					n->idxname = $5;
					n->relation = $7;
					n->accessMethod = $8;
					n->indexParams = $10;
					n->options = $12;
					n->tableSpace = $13;
					n->whereClause = $14;
					$$ = (Node *)n;
				}
		;

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

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

index_params:	index_elem							{ $$ = list_make1($1); }
			| index_params ',' index_elem			{ $$ = lappend($1, $3); }
		;

/*
 * Index attributes can be either simple column references, or arbitrary
 * expressions in parens.  For backwards-compatibility reasons, we allow
 * an expression that's just a function call to be written without parens.
 */
index_elem:	ColId opt_class
				{
					$$ = makeNode(IndexElem);
					$$->name = $1;
					$$->expr = NULL;
					$$->opclass = $2;
				}
			| func_expr opt_class
				{
					$$ = makeNode(IndexElem);
					$$->name = NULL;
					$$->expr = $1;
					$$->opclass = $2;
				}
			| '(' a_expr ')' opt_class
				{
					$$ = makeNode(IndexElem);
					$$->name = NULL;
					$$->expr = $2;
					$$->opclass = $4;
				}
		;

opt_class:	any_name								{ $$ = $1; }
			| USING any_name						{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
		;

/*****************************************************************************
 *
 *		QUERY:
 *				create [or replace] function <fname>
 *						[(<type-1> { , <type-n>})]
 *						returns <type-r>
 *						as <filename or code in language as appropriate>
 *						language <lang> [with parameters]
 *
 *****************************************************************************/

CreateFunctionStmt:
			CREATE opt_or_replace FUNCTION func_name func_args
			RETURNS func_return createfunc_opt_list opt_definition
				{
					CreateFunctionStmt *n = makeNode(CreateFunctionStmt);
					n->replace = $2;
					n->funcname = $4;
					n->parameters = $5;
					n->returnType = $7;
					n->options = $8;
					n->withClause = $9;
					$$ = (Node *)n;
				}
			| CREATE opt_or_replace FUNCTION func_name func_args
			  createfunc_opt_list opt_definition
				{
					CreateFunctionStmt *n = makeNode(CreateFunctionStmt);
					n->replace = $2;
					n->funcname = $4;
					n->parameters = $5;
					n->returnType = NULL;
					n->options = $6;
					n->withClause = $7;
					$$ = (Node *)n;
				}
		;

opt_or_replace:
			OR REPLACE								{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
		;

func_args:	'(' func_args_list ')'					{ $$ = $2; }
			| '(' ')'								{ $$ = NIL; }
		;

func_args_list:
			func_arg								{ $$ = list_make1($1); }
			| func_args_list ',' func_arg			{ $$ = lappend($1, $3); }
		;

/*
 * The style with arg_class first is SQL99 standard, but Oracle puts
 * param_name first; accept both since it's likely people will try both
 * anyway.  Don't bother trying to save productions by letting arg_class
 * have an empty alternative ... you'll get shift/reduce conflicts.
 *
 * We can catch over-specified arguments here if we want to,
 * but for now better to silently swallow typmod, etc.
 * - thomas 2000-03-22
 */
func_arg:
			arg_class param_name func_type
				{
					FunctionParameter *n = makeNode(FunctionParameter);
					n->name = $2;
					n->argType = $3;
					n->mode = $1;
					$$ = n;
				}
			| param_name arg_class func_type
				{
					FunctionParameter *n = makeNode(FunctionParameter);
					n->name = $1;
					n->argType = $3;
					n->mode = $2;
					$$ = n;
				}
			| param_name func_type
				{
					FunctionParameter *n = makeNode(FunctionParameter);
					n->name = $1;
					n->argType = $2;
					n->mode = FUNC_PARAM_IN;
					$$ = n;
				}
			| arg_class func_type
				{
					FunctionParameter *n = makeNode(FunctionParameter);
					n->name = NULL;
					n->argType = $2;
					n->mode = $1;
					$$ = n;
				}
			| func_type
				{
					FunctionParameter *n = makeNode(FunctionParameter);
					n->name = NULL;
					n->argType = $1;
					n->mode = FUNC_PARAM_IN;
					$$ = n;
				}
		;

/* INOUT is SQL99 standard, IN OUT is for Oracle compatibility */
arg_class:	IN_P									{ $$ = FUNC_PARAM_IN; }
			| OUT_P									{ $$ = FUNC_PARAM_OUT; }
			| INOUT									{ $$ = FUNC_PARAM_INOUT; }
			| IN_P OUT_P							{ $$ = FUNC_PARAM_INOUT; }
		;

/*
 * Ideally param_name should be ColId, but that causes too many conflicts.
 */
param_name:	function_name
		;

func_return:
			func_type
				{
					/* We can catch over-specified results here if we want to,
					 * but for now better to silently swallow typmod, etc.
					 * - thomas 2000-03-22
					 */
					$$ = $1;
				}
		;

/*
 * We would like to make the %TYPE productions here be ColId attrs etc,
 * but that causes reduce/reduce conflicts.  type_name is next best choice.
 */
func_type:	Typename								{ $$ = $1; }
			| type_name attrs '%' TYPE_P
				{
					$$ = makeNode(TypeName);
					$$->names = lcons(makeString($1), $2);
					$$->pct_type = true;
					$$->typmod = -1;
					$$->location = @1;
				}
			| SETOF type_name attrs '%' TYPE_P
				{
					$$ = makeNode(TypeName);
					$$->names = lcons(makeString($2), $3);
					$$->pct_type = true;
					$$->typmod = -1;
					$$->setof = TRUE;
					$$->location = @2;
				}
		;


createfunc_opt_list:
			/* Must be at least one to prevent conflict */
			createfunc_opt_item                     { $$ = list_make1($1); }
			| createfunc_opt_list createfunc_opt_item { $$ = lappend($1, $2); }
	;

/*
 * Options common to both CREATE FUNCTION and ALTER FUNCTION
 */
common_func_opt_item:
			CALLED ON NULL_P INPUT_P
				{
					$$ = makeDefElem("strict", (Node *)makeInteger(FALSE));
				}
			| RETURNS NULL_P ON NULL_P INPUT_P
				{
					$$ = makeDefElem("strict", (Node *)makeInteger(TRUE));
				}
			| STRICT_P
				{
					$$ = makeDefElem("strict", (Node *)makeInteger(TRUE));
				}
			| IMMUTABLE
				{
					$$ = makeDefElem("volatility", (Node *)makeString("immutable"));
				}
			| STABLE
				{
					$$ = makeDefElem("volatility", (Node *)makeString("stable"));
				}
			| VOLATILE
				{
					$$ = makeDefElem("volatility", (Node *)makeString("volatile"));
				}
			| EXTERNAL SECURITY DEFINER
				{
					$$ = makeDefElem("security", (Node *)makeInteger(TRUE));
				}
			| EXTERNAL SECURITY INVOKER
				{
					$$ = makeDefElem("security", (Node *)makeInteger(FALSE));
				}
			| SECURITY DEFINER
				{
					$$ = makeDefElem("security", (Node *)makeInteger(TRUE));
				}
			| SECURITY INVOKER
				{
					$$ = makeDefElem("security", (Node *)makeInteger(FALSE));
				}
		;

createfunc_opt_item:
			AS func_as
				{
					$$ = makeDefElem("as", (Node *)$2);
				}
			| LANGUAGE ColId_or_Sconst
				{
					$$ = makeDefElem("language", (Node *)makeString($2));
				}
			| common_func_opt_item
				{
					$$ = $1;
				}
		;

func_as:	Sconst						{ $$ = list_make1(makeString($1)); }
			| Sconst ',' Sconst
				{
					$$ = list_make2(makeString($1), makeString($3));
				}
		;

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

/*****************************************************************************
 * ALTER FUNCTION
 *
 * RENAME and OWNER subcommands are already provided by the generic
 * ALTER infrastructure, here we just specify alterations that can
 * only be applied to functions.
 *
 *****************************************************************************/
AlterFunctionStmt:
			ALTER FUNCTION function_with_argtypes alterfunc_opt_list opt_restrict
				{
					AlterFunctionStmt *n = makeNode(AlterFunctionStmt);
					n->func = $3;
					n->actions = $4;
					$$ = (Node *) n;
				}
		;

alterfunc_opt_list:
			/* At least one option must be specified */
			common_func_opt_item					{ $$ = list_make1($1); }
			| alterfunc_opt_list common_func_opt_item { $$ = lappend($1, $2); }
		;

/* Ignored, merely for SQL compliance */
opt_restrict:
			RESTRICT
			| /* EMPTY */
		;


/*****************************************************************************
 *
 *		QUERY:
 *
 *		DROP FUNCTION funcname (arg1, arg2, ...) [ RESTRICT | CASCADE ]
 *		DROP AGGREGATE aggname (arg1, ...) [ RESTRICT | CASCADE ]
 *		DROP OPERATOR opname (leftoperand_typ, rightoperand_typ) [ RESTRICT | CASCADE ]
 *
 *****************************************************************************/

RemoveFuncStmt:
			DROP FUNCTION func_name func_args opt_drop_behavior
				{
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->kind = OBJECT_FUNCTION;
					n->name = $3;
					n->args = extractArgTypes($4);
					n->behavior = $5;
					n->missing_ok = false;
					$$ = (Node *)n;
				}
			| DROP FUNCTION IF_P EXISTS func_name func_args opt_drop_behavior
				{
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->kind = OBJECT_FUNCTION;
					n->name = $5;
					n->args = extractArgTypes($6);
					n->behavior = $7;
					n->missing_ok = true;
					$$ = (Node *)n;
				}
		;

RemoveAggrStmt:
			DROP AGGREGATE func_name aggr_args opt_drop_behavior
				{
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->kind = OBJECT_AGGREGATE;
					n->name = $3;
					n->args = $4;
					n->behavior = $5;
					n->missing_ok = false;
					$$ = (Node *)n;
				}
			| DROP AGGREGATE IF_P EXISTS func_name aggr_args opt_drop_behavior
				{
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->kind = OBJECT_AGGREGATE;
					n->name = $5;
					n->args = $6;
					n->behavior = $7;
					n->missing_ok = true;
					$$ = (Node *)n;
				}
		;

RemoveOperStmt:
			DROP OPERATOR any_operator '(' oper_argtypes ')' opt_drop_behavior
				{
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->kind = OBJECT_OPERATOR;
					n->name = $3;
					n->args = $5;
					n->behavior = $7;
					n->missing_ok = false;
					$$ = (Node *)n;
				}
			| DROP OPERATOR IF_P EXISTS any_operator '(' oper_argtypes ')' opt_drop_behavior
				{
					RemoveFuncStmt *n = makeNode(RemoveFuncStmt);
					n->kind = OBJECT_OPERATOR;
					n->name = $5;
					n->args = $7;
					n->behavior = $9;
					n->missing_ok = true;
					$$ = (Node *)n;
				}
		;

oper_argtypes:
			Typename
				{
				   ereport(ERROR,
						   (errcode(ERRCODE_SYNTAX_ERROR),
							errmsg("missing argument"),
							errhint("Use NONE to denote the missing argument of a unary operator.")));
				}
			| Typename ',' Typename
					{ $$ = list_make2($1, $3); }
			| NONE ',' Typename /* left unary */
					{ $$ = list_make2(NULL, $3); }
			| Typename ',' NONE /* right unary */
					{ $$ = list_make2($1, NULL); }
		;

any_operator:
			all_Op
					{ $$ = list_make1(makeString($1)); }
			| ColId '.' any_operator
					{ $$ = lcons(makeString($1), $3); }
		;


/*****************************************************************************
 *
 *		CREATE CAST / DROP CAST
 *
 *****************************************************************************/

CreateCastStmt: CREATE CAST '(' Typename AS Typename ')'
					WITH FUNCTION function_with_argtypes cast_context
				{
					CreateCastStmt *n = makeNode(CreateCastStmt);
					n->sourcetype = $4;
					n->targettype = $6;
					n->func = $10;
					n->context = (CoercionContext) $11;
					$$ = (Node *)n;
				}
			| CREATE CAST '(' Typename AS Typename ')'
					WITHOUT FUNCTION cast_context
				{
					CreateCastStmt *n = makeNode(CreateCastStmt);
					n->sourcetype = $4;
					n->targettype = $6;
					n->func = NULL;
					n->context = (CoercionContext) $10;
					$$ = (Node *)n;
				}
		;

cast_context:  AS IMPLICIT_P					{ $$ = COERCION_IMPLICIT; }
		| AS ASSIGNMENT							{ $$ = COERCION_ASSIGNMENT; }
		| /*EMPTY*/								{ $$ = COERCION_EXPLICIT; }
		;


DropCastStmt: DROP CAST opt_if_exists '(' Typename AS Typename ')' opt_drop_behavior
				{
					DropCastStmt *n = makeNode(DropCastStmt);
					n->sourcetype = $5;
					n->targettype = $7;
					n->behavior = $9;
					n->missing_ok = $3;
					$$ = (Node *)n;
				}
		;

opt_if_exists: IF_P EXISTS						{ $$ = true; }
		| /*EMPTY*/								{ $$ = false; }
		;


/*****************************************************************************
 *
 *		QUERY:
 *
 *		REINDEX type <name> [FORCE]
 *
 * FORCE no longer does anything, but we accept it for backwards compatibility
 *****************************************************************************/

ReindexStmt:
			REINDEX reindex_type qualified_name opt_force
				{
					ReindexStmt *n = makeNode(ReindexStmt);
					n->kind = $2;
					n->relation = $3;
					n->name = NULL;
					$$ = (Node *)n;
				}
			| REINDEX SYSTEM_P name opt_force
				{
					ReindexStmt *n = makeNode(ReindexStmt);
					n->kind = OBJECT_DATABASE;
					n->name = $3;
					n->relation = NULL;
					n->do_system = true;
					n->do_user = false;
					$$ = (Node *)n;
				}
			| REINDEX DATABASE name opt_force
				{
					ReindexStmt *n = makeNode(ReindexStmt);
					n->kind = OBJECT_DATABASE;
					n->name = $3;
					n->relation = NULL;
					n->do_system = true;
					n->do_user = true;
					$$ = (Node *)n;
				}
		;

reindex_type:
			INDEX									{ $$ = OBJECT_INDEX; }
			| TABLE									{ $$ = OBJECT_TABLE; }
		;

opt_force:	FORCE									{  $$ = TRUE; }
			| /* EMPTY */							{  $$ = FALSE; }
		;


/*****************************************************************************
 *
 * ALTER THING name RENAME TO newname
 *
 *****************************************************************************/

RenameStmt: ALTER AGGREGATE func_name aggr_args RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_AGGREGATE;
					n->object = $3;
					n->objarg = $4;
					n->newname = $7;
					$$ = (Node *)n;
				}
			| ALTER CONVERSION_P any_name RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_CONVERSION;
					n->object = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER DATABASE database_name RENAME TO database_name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_DATABASE;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER FUNCTION func_name func_args RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_FUNCTION;
					n->object = $3;
					n->objarg = extractArgTypes($4);
					n->newname = $7;
					$$ = (Node *)n;
				}
			| ALTER GROUP_P RoleId RENAME TO RoleId
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_ROLE;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER LANGUAGE name RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_LANGUAGE;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER OPERATOR CLASS any_name USING access_method RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_OPCLASS;
					n->object = $4;
					n->subname = $6;
					n->newname = $9;
					$$ = (Node *)n;
				}
			| ALTER SCHEMA name RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_SCHEMA;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER TABLE relation_expr RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_TABLE;
					n->relation = $3;
					n->subname = NULL;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER INDEX relation_expr RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_INDEX;
					n->relation = $3;
					n->subname = NULL;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER TABLE relation_expr RENAME opt_column name TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_COLUMN;
					n->relation = $3;
					n->subname = $6;
					n->newname = $8;
					$$ = (Node *)n;
				}
			| ALTER TRIGGER name ON relation_expr RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_TRIGGER;
					n->relation = $5;
					n->subname = $3;
					n->newname = $8;
					$$ = (Node *)n;
				}
			| ALTER ROLE RoleId RENAME TO RoleId
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_ROLE;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER USER RoleId RENAME TO RoleId
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_ROLE;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
			| ALTER TABLESPACE name RENAME TO name
				{
					RenameStmt *n = makeNode(RenameStmt);
					n->renameType = OBJECT_TABLESPACE;
					n->subname = $3;
					n->newname = $6;
					$$ = (Node *)n;
				}
		;

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

/*****************************************************************************
 *
 * ALTER THING name SET SCHEMA name
 *
 *****************************************************************************/

AlterObjectSchemaStmt:
			ALTER AGGREGATE func_name aggr_args SET SCHEMA name
				{
					AlterObjectSchemaStmt *n = makeNode(AlterObjectSchemaStmt);
					n->objectType = OBJECT_AGGREGATE;
					n->object = $3;
					n->objarg = $4;
					n->newschema = $7;
					$$ = (Node *)n;
				}
			| ALTER DOMAIN_P any_name SET SCHEMA name
				{
					AlterObjectSchemaStmt *n = makeNode(AlterObjectSchemaStmt);
					n->objectType = OBJECT_DOMAIN;
					n->object = $3;
					n->newschema = $6;
					$$ = (Node *)n;
				}
			| ALTER FUNCTION func_name func_args SET SCHEMA name
				{
					AlterObjectSchemaStmt *n = makeNode(AlterObjectSchemaStmt);
					n->objectType = OBJECT_FUNCTION;
					n->object = $3;
					n->objarg = extractArgTypes($4);
					n->newschema = $7;
					$$ = (Node *)n;
				}
			| ALTER SEQUENCE relation_expr SET SCHEMA name
				{
					AlterObjectSchemaStmt *n = makeNode(AlterObjectSchemaStmt);
					n->objectType = OBJECT_SEQUENCE;
					n->relation = $3;
					n->newschema = $6;
					$$ = (Node *)n;
				}
			| ALTER TABLE relation_expr SET SCHEMA name
				{
					AlterObjectSchemaStmt *n = makeNode(AlterObjectSchemaStmt);
					n->objectType = OBJECT_TABLE;
					n->relation = $3;
					n->newschema = $6;
					$$ = (Node *)n;
				}
			| ALTER TYPE_P any_name SET SCHEMA name
				{
					AlterObjectSchemaStmt *n = makeNode(AlterObjectSchemaStmt);
					n->objectType = OBJECT_TYPE;
					n->object = $3;
					n->newschema = $6;
					$$ = (Node *)n;
				}
		;

/*****************************************************************************
 *
 * ALTER THING name OWNER TO newname
 *
 *****************************************************************************/

AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_AGGREGATE;
					n->object = $3;
					n->objarg = $4;
					n->newowner = $7;
					$$ = (Node *)n;
				}
			| ALTER CONVERSION_P any_name OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_CONVERSION;
					n->object = $3;
					n->newowner = $6;
					$$ = (Node *)n;
				}
			| ALTER DATABASE database_name OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_DATABASE;
					n->object = list_make1($3);
					n->newowner = $6;
					$$ = (Node *)n;
				}
			| ALTER DOMAIN_P any_name OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_DOMAIN;
					n->object = $3;
					n->newowner = $6;
					$$ = (Node *)n;
				}
			| ALTER FUNCTION func_name func_args OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_FUNCTION;
					n->object = $3;
					n->objarg = extractArgTypes($4);
					n->newowner = $7;
					$$ = (Node *)n;
				}
			| ALTER OPERATOR any_operator '(' oper_argtypes ')' OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_OPERATOR;
					n->object = $3;
					n->objarg = $5;
					n->newowner = $9;
					$$ = (Node *)n;
				}
			| ALTER OPERATOR CLASS any_name USING access_method OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_OPCLASS;
					n->object = $4;
					n->addname = $6;
					n->newowner = $9;
					$$ = (Node *)n;
				}
			| ALTER SCHEMA name OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_SCHEMA;
					n->object = list_make1($3);
					n->newowner = $6;
					$$ = (Node *)n;
				}
			| ALTER TYPE_P any_name OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_TYPE;
					n->object = $3;
					n->newowner = $6;
					$$ = (Node *)n;
				}
			| ALTER TABLESPACE name OWNER TO RoleId
				{
					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
					n->objectType = OBJECT_TABLESPACE;
					n->object = list_make1($3);
					n->newowner = $6;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 *		QUERY:	Define Rewrite Rule
 *
 *****************************************************************************/

RuleStmt:	CREATE opt_or_replace RULE name AS
			{ QueryIsRule=TRUE; }
			ON event TO qualified_name where_clause
			DO opt_instead RuleActionList
				{
					RuleStmt *n = makeNode(RuleStmt);
					n->replace = $2;
					n->relation = $10;
					n->rulename = $4;
					n->whereClause = $11;
					n->event = $8;
					n->instead = $13;
					n->actions = $14;
					$$ = (Node *)n;
					QueryIsRule=FALSE;
				}
		;

RuleActionList:
			NOTHING									{ $$ = NIL; }
			| RuleActionStmt						{ $$ = list_make1($1); }
			| '(' RuleActionMulti ')'				{ $$ = $2; }
		;

/* the thrashing around here is to discard "empty" statements... */
RuleActionMulti:
			RuleActionMulti ';' RuleActionStmtOrEmpty
				{ if ($3 != NULL)
					$$ = lappend($1, $3);
				  else
					$$ = $1;
				}
			| RuleActionStmtOrEmpty
				{ if ($1 != NULL)
					$$ = list_make1($1);
				  else
					$$ = NIL;
				}
		;

RuleActionStmt:
			SelectStmt
			| InsertStmt
			| UpdateStmt
			| DeleteStmt
			| NotifyStmt
		;

RuleActionStmtOrEmpty:
			RuleActionStmt							{ $$ = $1; }
			|	/*EMPTY*/							{ $$ = NULL; }
		;

event:		SELECT									{ $$ = CMD_SELECT; }
			| UPDATE								{ $$ = CMD_UPDATE; }
			| DELETE_P								{ $$ = CMD_DELETE; }
			| INSERT								{ $$ = CMD_INSERT; }
		 ;

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


DropRuleStmt:
			DROP RULE name ON qualified_name opt_drop_behavior
				{
					DropPropertyStmt *n = makeNode(DropPropertyStmt);
					n->relation = $5;
					n->property = $3;
					n->behavior = $6;
					n->removeType = OBJECT_RULE;
					n->missing_ok = false;
					$$ = (Node *) n;
				}
			| DROP RULE IF_P EXISTS name ON qualified_name opt_drop_behavior
				{
					DropPropertyStmt *n = makeNode(DropPropertyStmt);
					n->relation = $7;
					n->property = $5;
					n->behavior = $8;
					n->removeType = OBJECT_RULE;
					n->missing_ok = true;
					$$ = (Node *) n;
				}
		;


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

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

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

UnlistenStmt:
			UNLISTEN qualified_name
				{
					UnlistenStmt *n = makeNode(UnlistenStmt);
					n->relation = $2;
					$$ = (Node *)n;
				}
			| UNLISTEN '*'
				{
					UnlistenStmt *n = makeNode(UnlistenStmt);
					n->relation = makeNode(RangeVar);
					n->relation->relname = "*";
					n->relation->schemaname = NULL;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 *		Transactions:
 *
 *		BEGIN / COMMIT / ROLLBACK
 *		(also older versions END / ABORT)
 *
 *****************************************************************************/

TransactionStmt:
			ABORT_P opt_transaction
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_ROLLBACK;
					n->options = NIL;
					$$ = (Node *)n;
				}
			| BEGIN_P opt_transaction transaction_mode_list_or_empty
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_BEGIN;
					n->options = $3;
					$$ = (Node *)n;
				}
			| START TRANSACTION transaction_mode_list_or_empty
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_START;
					n->options = $3;
					$$ = (Node *)n;
				}
			| COMMIT opt_transaction
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_COMMIT;
					n->options = NIL;
					$$ = (Node *)n;
				}
			| END_P opt_transaction
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_COMMIT;
					n->options = NIL;
					$$ = (Node *)n;
				}
			| ROLLBACK opt_transaction
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_ROLLBACK;
					n->options = NIL;
					$$ = (Node *)n;
				}
			| SAVEPOINT ColId
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_SAVEPOINT;
					n->options = list_make1(makeDefElem("savepoint_name",
														(Node *)makeString($2)));
					$$ = (Node *)n;
				}
			| RELEASE SAVEPOINT ColId
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_RELEASE;
					n->options = list_make1(makeDefElem("savepoint_name",
														(Node *)makeString($3)));
					$$ = (Node *)n;
				}
			| RELEASE ColId
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_RELEASE;
					n->options = list_make1(makeDefElem("savepoint_name",
														(Node *)makeString($2)));
					$$ = (Node *)n;
				}
			| ROLLBACK opt_transaction TO SAVEPOINT ColId
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_ROLLBACK_TO;
					n->options = list_make1(makeDefElem("savepoint_name",
														(Node *)makeString($5)));
					$$ = (Node *)n;
				}
			| ROLLBACK opt_transaction TO ColId
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_ROLLBACK_TO;
					n->options = list_make1(makeDefElem("savepoint_name",
														(Node *)makeString($4)));
					$$ = (Node *)n;
				}
			| PREPARE TRANSACTION Sconst
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_PREPARE;
					n->gid = $3;
					$$ = (Node *)n;
				}
			| COMMIT PREPARED Sconst
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_COMMIT_PREPARED;
					n->gid = $3;
					$$ = (Node *)n;
				}
			| ROLLBACK PREPARED Sconst
				{
					TransactionStmt *n = makeNode(TransactionStmt);
					n->kind = TRANS_STMT_ROLLBACK_PREPARED;
					n->gid = $3;
					$$ = (Node *)n;
				}
		;

opt_transaction:	WORK							{}
			| TRANSACTION							{}
			| /*EMPTY*/								{}
		;

transaction_mode_item:
			ISOLATION LEVEL iso_level
					{ $$ = makeDefElem("transaction_isolation",
									   makeStringConst($3, NULL)); }
			| READ ONLY
					{ $$ = makeDefElem("transaction_read_only",
									   makeIntConst(TRUE)); }
			| READ WRITE
					{ $$ = makeDefElem("transaction_read_only",
									   makeIntConst(FALSE)); }
		;

/* Syntax with commas is SQL-spec, without commas is Postgres historical */
transaction_mode_list:
			transaction_mode_item
					{ $$ = list_make1($1); }
			| transaction_mode_list ',' transaction_mode_item
					{ $$ = lappend($1, $3); }
			| transaction_mode_list transaction_mode_item
					{ $$ = lappend($1, $2); }
		;

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


/*****************************************************************************
 *
 *	QUERY:
 *		CREATE [ OR REPLACE ] [ TEMP ] VIEW <viewname> '('target-list ')'
 *			AS <query> [ WITH [ CASCADED | LOCAL ] CHECK OPTION ]
 *
 *****************************************************************************/

ViewStmt: CREATE OptTemp VIEW qualified_name opt_column_list
				AS SelectStmt opt_check_option
				{
					ViewStmt *n = makeNode(ViewStmt);
					n->replace = false;
					n->view = $4;
					n->view->istemp = $2;
					n->aliases = $5;
					n->query = (Query *) $7;
					$$ = (Node *) n;
				}
		| CREATE OR REPLACE OptTemp VIEW qualified_name opt_column_list
				AS SelectStmt opt_check_option
				{
					ViewStmt *n = makeNode(ViewStmt);
					n->replace = true;
					n->view = $6;
					n->view->istemp = $4;
					n->aliases = $7;
					n->query = (Query *) $9;
					$$ = (Node *) n;
				}
		;

/*
 * We use merged tokens here to avoid creating shift/reduce conflicts against
 * a whole lot of other uses of WITH.
 */
opt_check_option:
		WITH_CHECK OPTION
				{
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("WITH CHECK OPTION is not implemented")));
				}
		| WITH_CASCADED CHECK OPTION
				{
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("WITH CHECK OPTION is not implemented")));
				}
		| WITH_LOCAL CHECK OPTION
				{
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("WITH CHECK OPTION is not implemented")));
				}
		| /* EMPTY */							{ $$ = NIL; }
		;

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

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


/*****************************************************************************
 *
 *		CREATE DATABASE
 *
 *****************************************************************************/

CreatedbStmt:
			CREATE DATABASE database_name opt_with createdb_opt_list
				{
					CreatedbStmt *n = makeNode(CreatedbStmt);
					n->dbname = $3;
					n->options = $5;
					$$ = (Node *)n;
				}
		;

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

createdb_opt_item:
			TABLESPACE opt_equal name
				{
					$$ = makeDefElem("tablespace", (Node *)makeString($3));
				}
			| TABLESPACE opt_equal DEFAULT
				{
					$$ = makeDefElem("tablespace", NULL);
				}
			| LOCATION opt_equal Sconst
				{
					$$ = makeDefElem("location", (Node *)makeString($3));
				}
			| LOCATION opt_equal DEFAULT
				{
					$$ = makeDefElem("location", NULL);
				}
			| TEMPLATE opt_equal name
				{
					$$ = makeDefElem("template", (Node *)makeString($3));
				}
			| TEMPLATE opt_equal DEFAULT
				{
					$$ = makeDefElem("template", NULL);
				}
			| ENCODING opt_equal Sconst
				{
					$$ = makeDefElem("encoding", (Node *)makeString($3));
				}
			| ENCODING opt_equal Iconst
				{
					$$ = makeDefElem("encoding", (Node *)makeInteger($3));
				}
			| ENCODING opt_equal DEFAULT
				{
					$$ = makeDefElem("encoding", NULL);
				}
			| CONNECTION LIMIT opt_equal SignedIconst
				{
					$$ = makeDefElem("connectionlimit", (Node *)makeInteger($4));
				}
			| OWNER opt_equal name
				{
					$$ = makeDefElem("owner", (Node *)makeString($3));
				}
			| OWNER opt_equal DEFAULT
				{
					$$ = makeDefElem("owner", NULL);
				}
		;

/*
 *	Though the equals sign doesn't match other WITH options, pg_dump uses
 *	equals for backward compatibility, and it doesn't seem worth removing it.
 */
opt_equal:	'='										{}
			| /*EMPTY*/								{}
		;


/*****************************************************************************
 *
 *		ALTER DATABASE
 *
 *****************************************************************************/

AlterDatabaseStmt:
			ALTER DATABASE database_name opt_with alterdb_opt_list
				 {
					AlterDatabaseStmt *n = makeNode(AlterDatabaseStmt);
					n->dbname = $3;
					n->options = $5;
					$$ = (Node *)n;
				 }
		;

AlterDatabaseSetStmt:
			ALTER DATABASE database_name SET set_rest
				{
					AlterDatabaseSetStmt *n = makeNode(AlterDatabaseSetStmt);
					n->dbname = $3;
					n->variable = $5->name;
					n->value = $5->args;
					$$ = (Node *)n;
				}
			| ALTER DATABASE database_name VariableResetStmt
				{
					AlterDatabaseSetStmt *n = makeNode(AlterDatabaseSetStmt);
					n->dbname = $3;
					n->variable = ((VariableResetStmt *)$4)->name;
					n->value = NIL;
					$$ = (Node *)n;
				}
		;


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

alterdb_opt_item:
			CONNECTION LIMIT opt_equal SignedIconst
				{
					$$ = makeDefElem("connectionlimit", (Node *)makeInteger($4));
				}
		;


/*****************************************************************************
 *
 *		DROP DATABASE [ IF EXISTS ]
 *
 * This is implicitly CASCADE, no need for drop behavior
 *****************************************************************************/

DropdbStmt: DROP DATABASE database_name
				{
					DropdbStmt *n = makeNode(DropdbStmt);
					n->dbname = $3;
					n->missing_ok = FALSE;
					$$ = (Node *)n;
				}
			| DROP DATABASE IF_P EXISTS database_name
				{
					DropdbStmt *n = makeNode(DropdbStmt);
					n->dbname = $5;
					n->missing_ok = TRUE;
					$$ = (Node *)n;
				}
		;


/*****************************************************************************
 *
 * Manipulate a domain
 *
 *****************************************************************************/

CreateDomainStmt:
			CREATE DOMAIN_P any_name opt_as Typename ColQualList
				{
					CreateDomainStmt *n = makeNode(CreateDomainStmt);
					n->domainname = $3;
					n->typename = $5;
					n->constraints = $6;
					$$ = (Node *)n;
				}
		;

AlterDomainStmt:
			/* ALTER DOMAIN <domain> {SET DEFAULT <expr>|DROP DEFAULT} */
			ALTER DOMAIN_P any_name alter_column_default
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'T';
					n->typename = $3;
					n->def = $4;
					$$ = (Node *)n;
				}
			/* ALTER DOMAIN <domain> DROP NOT NULL */
			| ALTER DOMAIN_P any_name DROP NOT NULL_P
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'N';
					n->typename = $3;
					$$ = (Node *)n;
				}
			/* ALTER DOMAIN <domain> SET NOT NULL */
			| ALTER DOMAIN_P any_name SET NOT NULL_P
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'O';
					n->typename = $3;
					$$ = (Node *)n;
				}
			/* ALTER DOMAIN <domain> ADD CONSTRAINT ... */
			| ALTER DOMAIN_P any_name ADD_P TableConstraint
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'C';
					n->typename = $3;
					n->def = $5;
					$$ = (Node *)n;
				}
			/* ALTER DOMAIN <domain> DROP CONSTRAINT <name> [RESTRICT|CASCADE] */
			| ALTER DOMAIN_P any_name DROP CONSTRAINT name opt_drop_behavior
				{
					AlterDomainStmt *n = makeNode(AlterDomainStmt);
					n->subtype = 'X';
					n->typename = $3;
					n->name = $6;
					n->behavior = $7;
					$$ = (Node *)n;
				}
			;

opt_as:		AS										{}
			| /* EMPTY */							{}
		;


/*****************************************************************************
 *
 * Manipulate a conversion
 *
 *		CREATE [DEFAULT] CONVERSION <conversion_name>
 *		FOR <encoding_name> TO <encoding_name> FROM <func_name>
 *
 *****************************************************************************/

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

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

ClusterStmt:
			CLUSTER index_name ON qualified_name
				{
				   ClusterStmt *n = makeNode(ClusterStmt);
				   n->relation = $4;
				   n->indexname = $2;
				   $$ = (Node*)n;
				}
			| CLUSTER qualified_name
				{
			       ClusterStmt *n = makeNode(ClusterStmt);
				   n->relation = $2;
				   n->indexname = NULL;
				   $$ = (Node*)n;
				}
			| CLUSTER
			    {
				   ClusterStmt *n = makeNode(ClusterStmt);
				   n->relation = NULL;
				   n->indexname = NULL;
				   $$ = (Node*)n;
				}
		;

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

VacuumStmt: VACUUM opt_full opt_freeze opt_verbose
				{
					VacuumStmt *n = makeNode(VacuumStmt);
					n->vacuum = true;
					n->analyze = false;
					n->full = $2;
					n->freeze_min_age = $3 ? 0 : -1;
					n->verbose = $4;
					n->relation = NULL;
					n->va_cols = NIL;
					$$ = (Node *)n;
				}
			| VACUUM opt_full opt_freeze opt_verbose qualified_name
				{
					VacuumStmt *n = makeNode(VacuumStmt);
					n->vacuum = true;
					n->analyze = false;
					n->full = $2;
					n->freeze_min_age = $3 ? 0 : -1;
					n->verbose = $4;
					n->relation = $5;
					n->va_cols = NIL;
					$$ = (Node *)n;
				}
			| VACUUM opt_full opt_freeze opt_verbose AnalyzeStmt
				{
					VacuumStmt *n = (VacuumStmt *) $5;
					n->vacuum = true;
					n->full = $2;
					n->freeze_min_age = $3 ? 0 : -1;
					n->verbose |= $4;
					$$ = (Node *)n;
				}
		;

AnalyzeStmt:
			analyze_keyword opt_verbose
				{
					VacuumStmt *n = makeNode(VacuumStmt);
					n->vacuum = false;
					n->analyze = true;
					n->full = false;
					n->freeze_min_age = -1;
					n->verbose = $2;
					n->relation = NULL;
					n->va_cols = NIL;
					$$ = (Node *)n;
				}
			| analyze_keyword opt_verbose qualified_name opt_name_list
				{
					VacuumStmt *n = makeNode(VacuumStmt);
					n->vacuum = false;
					n->analyze = true;
					n->full = false;
					n->freeze_min_age = -1;
					n->verbose = $2;
					n->relation = $3;
					n->va_cols = $4;
					$$ = (Node *)n;
				}
		;

analyze_keyword:
			ANALYZE									{}
			| ANALYSE /* British */					{}
		;

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

opt_full:	FULL									{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
		;

opt_freeze: FREEZE									{ $$ = TRUE; }
			| /*EMPTY*/								{ $$ = FALSE; }
		;

opt_name_list:
			'(' name_list ')'						{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
		;


/*****************************************************************************
 *
 *		QUERY:
 *				EXPLAIN [ANALYZE] [VERBOSE] query
 *
 *****************************************************************************/

ExplainStmt: EXPLAIN opt_analyze opt_verbose ExplainableStmt
				{
					ExplainStmt *n = makeNode(ExplainStmt);
					n->analyze = $2;
					n->verbose = $3;
					n->query = (Query*)$4;
					$$ = (Node *)n;
				}
		;

ExplainableStmt:
			SelectStmt
			| InsertStmt
			| UpdateStmt
			| DeleteStmt
			| DeclareCursorStmt
			| ExecuteStmt					/* by default all are $$=$1 */
		;

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

/*****************************************************************************
 *
 *		QUERY:
 *				PREPARE <plan_name> [(args, ...)] AS <query>
 *
 *****************************************************************************/

PrepareStmt: PREPARE name prep_type_clause AS PreparableStmt
				{
					PrepareStmt *n = makeNode(PrepareStmt);
					n->name = $2;
					n->argtypes = $3;
					n->query = (Query *) $5;
					$$ = (Node *) n;
				}
		;

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

prep_type_list: Typename			{ $$ = list_make1($1); }
			  | prep_type_list ',' Typename
									{ $$ = lappend($1, $3); }
		;

PreparableStmt:
			SelectStmt
			| InsertStmt
			| UpdateStmt
			| DeleteStmt					/* by default all are $$=$1 */
		;

/*****************************************************************************
 *
 * EXECUTE <plan_name> [(params, ...)]
 * CREATE TABLE <name> AS EXECUTE <plan_name> [(params, ...)]
 *
 *****************************************************************************/

ExecuteStmt: EXECUTE name execute_param_clause
				{
					ExecuteStmt *n = makeNode(ExecuteStmt);
					n->name = $2;
					n->params = $3;
					n->into = NULL;
					$$ = (Node *) n;
				}
			| CREATE OptTemp TABLE qualified_name OptCreateAs
				OptWith OnCommitOption OptTableSpace AS
				EXECUTE name execute_param_clause
				{
					ExecuteStmt *n = makeNode(ExecuteStmt);
					n->name = $11;
					n->params = $12;
					$4->istemp = $2;
					n->into = $4;
					n->intoOptions = $6;
					n->into_on_commit = $7;
					n->into_tbl_space = $8;
					if ($5)
						ereport(ERROR,
								(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
								 errmsg("column name list not allowed in CREATE TABLE / AS EXECUTE")));
					/* ... because it's not implemented, but it could be */
					$$ = (Node *) n;
				}
		;

execute_param_clause: '(' expr_list ')'				{ $$ = $2; }
					| /* EMPTY */					{ $$ = NIL; }
					;

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

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

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

InsertStmt:
			INSERT INTO qualified_name insert_rest returning_clause
				{
					$4->relation = $3;
					$4->returningList = $5;
					$$ = (Node *) $4;
				}
		;

insert_rest:
			SelectStmt
				{
					$$ = makeNode(InsertStmt);
					$$->cols = NIL;
					$$->selectStmt = $1;
				}
			| '(' insert_column_list ')' SelectStmt
				{
					$$ = makeNode(InsertStmt);
					$$->cols = $2;
					$$->selectStmt = $4;
				}
			| DEFAULT VALUES
				{
					$$ = makeNode(InsertStmt);
					$$->cols = NIL;
					$$->selectStmt = NULL;
				}
		;

insert_column_list:
			insert_column_item
					{ $$ = list_make1($1); }
			| insert_column_list ',' insert_column_item
					{ $$ = lappend($1, $3); }
		;

insert_column_item:
			ColId opt_indirection
				{
					$$ = makeNode(ResTarget);
					$$->name = $1;
					$$->indirection = $2;
					$$->val = NULL;
					$$->location = @1;
				}
		;

returning_clause:
			RETURNING target_list		{ $$ = $2; }
			| /* EMPTY */				{ $$ = NIL; }
		;


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

DeleteStmt: DELETE_P FROM relation_expr_opt_alias
			using_clause where_clause returning_clause
				{
					DeleteStmt *n = makeNode(DeleteStmt);
					n->relation = $3;
					n->usingClause = $4;
					n->whereClause = $5;
					n->returningList = $6;
					$$ = (Node *)n;
				}
		;

using_clause:
	    		USING from_list						{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
		;

LockStmt:	LOCK_P opt_table qualified_name_list opt_lock opt_nowait
				{
					LockStmt *n = makeNode(LockStmt);

					n->relations = $3;
					n->mode = $4;
					n->nowait = $5;
					$$ = (Node *)n;
				}
		;

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

lock_type:	ACCESS SHARE					{ $$ = AccessShareLock; }
			| ROW SHARE						{ $$ = RowShareLock; }
			| ROW EXCLUSIVE					{ $$ = RowExclusiveLock; }
			| SHARE UPDATE EXCLUSIVE		{ $$ = ShareUpdateExclusiveLock; }
			| SHARE							{ $$ = ShareLock; }
			| SHARE ROW EXCLUSIVE			{ $$ = ShareRowExclusiveLock; }
			| EXCLUSIVE						{ $$ = ExclusiveLock; }
			| ACCESS EXCLUSIVE				{ $$ = AccessExclusiveLock; }
		;

opt_nowait:	NOWAIT							{ $$ = TRUE; }
			| /*EMPTY*/						{ $$ = FALSE; }
		;


/*****************************************************************************
 *
 *		QUERY:
 *				UpdateStmt (UPDATE)
 *
 *****************************************************************************/

UpdateStmt: UPDATE relation_expr_opt_alias
			SET set_clause_list
			from_clause
			where_clause
			returning_clause
				{
					UpdateStmt *n = makeNode(UpdateStmt);
					n->relation = $2;
					n->targetList = $4;
					n->fromClause = $5;
					n->whereClause = $6;
					n->returningList = $7;
					$$ = (Node *)n;
				}
		;

set_clause_list:
			set_clause							{ $$ = $1; }
			| set_clause_list ',' set_clause	{ $$ = list_concat($1,$3); }
		;

set_clause:
			single_set_clause						{ $$ = list_make1($1); }
			| multiple_set_clause					{ $$ = $1; }
		;

single_set_clause:
			set_target '=' ctext_expr
				{
					$$ = $1;
					$$->val = (Node *) $3;
				}
		;

multiple_set_clause:
			'(' set_target_list ')' '=' ctext_row
				{
					ListCell *col_cell;
					ListCell *val_cell;

					/*
					 * Break the ctext_row apart, merge individual expressions
					 * into the destination ResTargets.  XXX this approach
					 * cannot work for general row expressions as sources.
					 */
					if (list_length($2) != list_length($5))
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("number of columns does not match number of values")));
					forboth(col_cell, $2, val_cell, $5)
					{
						ResTarget *res_col = (ResTarget *) lfirst(col_cell);
						Node *res_val = (Node *) lfirst(val_cell);

						res_col->val = res_val;
					}
				    
					$$ = $2;
				}
		;

set_target:
			ColId opt_indirection
				{
					$$ = makeNode(ResTarget);
					$$->name = $1;
					$$->indirection = $2;
					$$->val = NULL;	/* upper production sets this */
					$$->location = @1;
				}
		;

set_target_list:
			set_target								{ $$ = list_make1($1); }
			| set_target_list ',' set_target		{ $$ = lappend($1,$3); }
		;


/*****************************************************************************
 *
 *		QUERY:
 *				CURSOR STATEMENTS
 *
 *****************************************************************************/
DeclareCursorStmt: DECLARE name cursor_options CURSOR opt_hold FOR SelectStmt
				{
					DeclareCursorStmt *n = makeNode(DeclareCursorStmt);
					n->portalname = $2;
					n->options = $3;
					n->query = $7;
					if ($5)
						n->options |= CURSOR_OPT_HOLD;
					$$ = (Node *)n;
				}
		;

cursor_options: /*EMPTY*/					{ $$ = 0; }
			| cursor_options NO SCROLL		{ $$ = $1 | CURSOR_OPT_NO_SCROLL; }
			| cursor_options SCROLL			{ $$ = $1 | CURSOR_OPT_SCROLL; }
			| cursor_options BINARY			{ $$ = $1 | CURSOR_OPT_BINARY; }
			| cursor_options INSENSITIVE	{ $$ = $1 | CURSOR_OPT_INSENSITIVE; }
		;

opt_hold: /* EMPTY */						{ $$ = FALSE; }
			| WITH HOLD						{ $$ = TRUE; }
			| WITHOUT HOLD					{ $$ = FALSE; }
		;

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

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

SelectStmt: select_no_parens			%prec UMINUS
			| select_with_parens		%prec UMINUS
		;

select_with_parens:
			'(' select_no_parens ')'				{ $$ = $2; }
			| '(' select_with_parens ')'			{ $$ = $2; }
		;

/*
 *	FOR UPDATE/SHARE may be before or after LIMIT/OFFSET.
 *	In <=7.2.X, LIMIT/OFFSET had to be after FOR UPDATE
 *	We now support both orderings, but prefer LIMIT/OFFSET before FOR UPDATE/SHARE
 *	2002-08-28 bjm
 */
select_no_parens:
			simple_select						{ $$ = $1; }
			| select_clause sort_clause
				{
					insertSelectOptions((SelectStmt *) $1, $2, NIL,
										NULL, NULL);
					$$ = $1;
				}
			| select_clause opt_sort_clause for_locking_clause opt_select_limit
				{
					insertSelectOptions((SelectStmt *) $1, $2, $3,
										list_nth($4, 0), list_nth($4, 1));
					$$ = $1;
				}
			| select_clause opt_sort_clause select_limit opt_for_locking_clause
				{
					insertSelectOptions((SelectStmt *) $1, $2, $4,
										list_nth($3, 0), list_nth($3, 1));
					$$ = $1;
				}
		;

select_clause:
			simple_select							{ $$ = $1; }
			| select_with_parens					{ $$ = $1; }
		;

/*
 * This rule parses SELECT statements that can appear within set operations,
 * including UNION, INTERSECT and EXCEPT.  '(' and ')' can be used to specify
 * the ordering of the set operations.	Without '(' and ')' we want the
 * operations to be ordered per the precedence specs at the head of this file.
 *
 * As with select_no_parens, simple_select cannot have outer parentheses,
 * but can have parenthesized subclauses.
 *
 * Note that sort clauses cannot be included at this level --- SQL92 requires
 *		SELECT foo UNION SELECT bar ORDER BY baz
 * to be parsed as
 *		(SELECT foo UNION SELECT bar) ORDER BY baz
 * not
 *		SELECT foo UNION (SELECT bar ORDER BY baz)
 * Likewise FOR UPDATE and LIMIT.  Therefore, those clauses are described
 * as part of the select_no_parens production, not simple_select.
 * This does not limit functionality, because you can reintroduce sort and
 * limit clauses inside parentheses.
 *
 * NOTE: only the leftmost component SelectStmt should have INTO.
 * However, this is not checked by the grammar; parse analysis must check it.
 */
simple_select:
			SELECT opt_distinct target_list
			into_clause from_clause where_clause
			group_clause having_clause
				{
					SelectStmt *n = makeNode(SelectStmt);
					n->distinctClause = $2;
					n->targetList = $3;
					n->into = $4;
					n->intoColNames = NIL;
					n->fromClause = $5;
					n->whereClause = $6;
					n->groupClause = $7;
					n->havingClause = $8;
					$$ = (Node *)n;
				}
			| values_clause							{ $$ = $1; }
			| select_clause UNION opt_all select_clause
				{
					$$ = makeSetOp(SETOP_UNION, $3, $1, $4);
				}
			| select_clause INTERSECT opt_all select_clause
				{
					$$ = makeSetOp(SETOP_INTERSECT, $3, $1, $4);
				}
			| select_clause EXCEPT opt_all select_clause
				{
					$$ = makeSetOp(SETOP_EXCEPT, $3, $1, $4);
				}
		;

into_clause:
			INTO OptTempTableName					{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NULL; }
		;

/*
 * Redundancy here is needed to avoid shift/reduce conflicts,
 * since TEMP is not a reserved word.  See also OptTemp.
 */
OptTempTableName:
			TEMPORARY opt_table qualified_name
				{
					$$ = $3;
					$$->istemp = true;
				}
			| TEMP opt_table qualified_name
				{
					$$ = $3;
					$$->istemp = true;
				}
			| LOCAL TEMPORARY opt_table qualified_name
				{
					$$ = $4;
					$$->istemp = true;
				}
			| LOCAL TEMP opt_table qualified_name
				{
					$$ = $4;
					$$->istemp = true;
				}
			| GLOBAL TEMPORARY opt_table qualified_name
				{
					$$ = $4;
					$$->istemp = true;
				}
			| GLOBAL TEMP opt_table qualified_name
				{
					$$ = $4;
					$$->istemp = true;
				}
			| TABLE qualified_name
				{
					$$ = $2;
					$$->istemp = false;
				}
			| qualified_name
				{
					$$ = $1;
					$$->istemp = false;
				}
		;

opt_table:	TABLE									{}
			| /*EMPTY*/								{}
		;

opt_all:	ALL										{ $$ = TRUE; }
			| DISTINCT								{ $$ = FALSE; }
			| /*EMPTY*/								{ $$ = FALSE; }
		;

/* We use (NIL) as a placeholder to indicate that all target expressions
 * should be placed in the DISTINCT list during parsetree analysis.
 */
opt_distinct:
			DISTINCT								{ $$ = list_make1(NIL); }
			| DISTINCT ON '(' expr_list ')'			{ $$ = $4; }
			| ALL									{ $$ = NIL; }
			| /*EMPTY*/								{ $$ = NIL; }
		;

opt_sort_clause:
			sort_clause								{ $$ = $1;}
			| /*EMPTY*/								{ $$ = NIL; }
		;

sort_clause:
			ORDER BY sortby_list					{ $$ = $3; }
		;

sortby_list:
			sortby									{ $$ = list_make1($1); }
			| sortby_list ',' sortby				{ $$ = lappend($1, $3); }
		;

sortby:		a_expr USING qual_all_Op
				{
					$$ = makeNode(SortBy);
					$$->node = $1;
					$$->sortby_kind = SORTBY_USING;
					$$->useOp = $3;
				}
			| a_expr ASC
				{
					$$ = makeNode(SortBy);
					$$->node = $1;
					$$->sortby_kind = SORTBY_ASC;
					$$->useOp = NIL;
				}
			| a_expr DESC
				{
					$$ = makeNode(SortBy);
					$$->node = $1;
					$$->sortby_kind = SORTBY_DESC;
					$$->useOp = NIL;
				}
			| a_expr
				{
					$$ = makeNode(SortBy);
					$$->node = $1;
					$$->sortby_kind = SORTBY_ASC;	/* default */
					$$->useOp = NIL;
				}
		;


select_limit:
			LIMIT select_limit_value OFFSET select_offset_value
				{ $$ = list_make2($4, $2); }
			| OFFSET select_offset_value LIMIT select_limit_value
				{ $$ = list_make2($2, $4); }
			| LIMIT select_limit_value
				{ $$ = list_make2(NULL, $2); }
			| OFFSET select_offset_value
				{ $$ = list_make2($2, NULL); }
			| LIMIT select_limit_value ',' select_offset_value
				{
					/* Disabled because it was too confusing, bjm 2002-02-18 */
					ereport(ERROR,
							(errcode(ERRCODE_SYNTAX_ERROR),
							 errmsg("LIMIT #,# syntax is not supported"),
							 errhint("Use separate LIMIT and OFFSET clauses.")));
				}
		;

opt_select_limit:
			select_limit							{ $$ = $1; }
			| /* EMPTY */
					{ $$ = list_make2(NULL,NULL); }
		;

select_limit_value:
			a_expr									{ $$ = $1; }
			| ALL
				{
					/* LIMIT ALL is represented as a NULL constant */
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Null;
					$$ = (Node *)n;
				}
		;

select_offset_value:
			a_expr									{ $$ = $1; }
		;

group_clause:
			GROUP_P BY expr_list					{ $$ = $3; }
			| /*EMPTY*/								{ $$ = NIL; }
		;

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

for_locking_clause:
			for_locking_items						{ $$ = $1; }
			| FOR READ ONLY							{ $$ = NIL; }
		;

opt_for_locking_clause:
			for_locking_clause						{ $$ = $1; }
			| /* EMPTY */							{ $$ = NIL; }
		;

for_locking_items:
			for_locking_item						{ $$ = list_make1($1); }
			| for_locking_items for_locking_item	{ $$ = lappend($1, $2); }
		;

for_locking_item:
			FOR UPDATE locked_rels_list opt_nowait
				{
					LockingClause *n = makeNode(LockingClause);
					n->lockedRels = $3;
					n->forUpdate = TRUE;
					n->noWait = $4;
					$$ = (Node *) n;
				}
			| FOR SHARE locked_rels_list opt_nowait
				{
					LockingClause *n = makeNode(LockingClause);
					n->lockedRels = $3;
					n->forUpdate = FALSE;
					n->noWait = $4;
					$$ = (Node *) n;
				}
		;

locked_rels_list:
			OF name_list							{ $$ = $2; }
			| /* EMPTY */							{ $$ = NIL; }
		;


values_clause:
			VALUES ctext_row
				{
					SelectStmt *n = makeNode(SelectStmt);
					n->valuesLists = list_make1($2);
					$$ = (Node *) n;
				}
			| values_clause ',' ctext_row
				{
					SelectStmt *n = (SelectStmt *) $1;
					n->valuesLists = lappend(n->valuesLists, $3);
					$$ = (Node *) n;
				}
		;


/*****************************************************************************
 *
 *	clauses common to all Optimizable Stmts:
 *		from_clause		- allow list of both JOIN expressions and table names
 *		where_clause	- qualifications for joins or restrictions
 *
 *****************************************************************************/

from_clause:
			FROM from_list							{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NIL; }
		;

from_list:
			table_ref								{ $$ = list_make1($1); }
			| from_list ',' table_ref				{ $$ = lappend($1, $3); }
		;

/*
 * table_ref is where an alias clause can be attached.	Note we cannot make
 * alias_clause have an empty production because that causes parse conflicts
 * between table_ref := '(' joined_table ')' alias_clause
 * and joined_table := '(' joined_table ')'.  So, we must have the
 * redundant-looking productions here instead.
 */
table_ref:	relation_expr
				{
					$$ = (Node *) $1;
				}
			| relation_expr alias_clause
				{
					$1->alias = $2;
					$$ = (Node *) $1;
				}
			| func_table
				{
					RangeFunction *n = makeNode(RangeFunction);
					n->funccallnode = $1;
					n->coldeflist = NIL;
					$$ = (Node *) n;
				}
			| func_table alias_clause
				{
					RangeFunction *n = makeNode(RangeFunction);
					n->funccallnode = $1;
					n->alias = $2;
					n->coldeflist = NIL;
					$$ = (Node *) n;
				}
			| func_table AS '(' TableFuncElementList ')'
				{
					RangeFunction *n = makeNode(RangeFunction);
					n->funccallnode = $1;
					n->coldeflist = $4;
					$$ = (Node *) n;
				}
			| func_table AS ColId '(' TableFuncElementList ')'
				{
					RangeFunction *n = makeNode(RangeFunction);
					Alias *a = makeNode(Alias);
					n->funccallnode = $1;
					a->aliasname = $3;
					n->alias = a;
					n->coldeflist = $5;
					$$ = (Node *) n;
				}
			| func_table ColId '(' TableFuncElementList ')'
				{
					RangeFunction *n = makeNode(RangeFunction);
					Alias *a = makeNode(Alias);
					n->funccallnode = $1;
					a->aliasname = $2;
					n->alias = a;
					n->coldeflist = $4;
					$$ = (Node *) n;
				}
			| select_with_parens
				{
					/*
					 * The SQL spec does not permit a subselect
					 * (<derived_table>) without an alias clause,
					 * so we don't either.  This avoids the problem
					 * of needing to invent a unique refname for it.
					 * That could be surmounted if there's sufficient
					 * popular demand, but for now let's just implement
					 * the spec and see if anyone complains.
					 * However, it does seem like a good idea to emit
					 * an error message that's better than "syntax error".
					 */
					if (IsA($1, SelectStmt) &&
						((SelectStmt *) $1)->valuesLists)
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("VALUES in FROM must have an alias"),
								 errhint("For example, FROM (VALUES ...) [AS] foo.")));
					else
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("subquery in FROM must have an alias"),
								 errhint("For example, FROM (SELECT ...) [AS] foo.")));
					$$ = NULL;
				}
			| select_with_parens alias_clause
				{
					RangeSubselect *n = makeNode(RangeSubselect);
					n->subquery = $1;
					n->alias = $2;
					$$ = (Node *) n;
				}
			| joined_table
				{
					$$ = (Node *) $1;
				}
			| '(' joined_table ')' alias_clause
				{
					$2->alias = $4;
					$$ = (Node *) $2;
				}
		;


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

joined_table:
			'(' joined_table ')'
				{
					$$ = $2;
				}
			| table_ref CROSS JOIN table_ref
				{
					/* CROSS JOIN is same as unqualified inner join */
					JoinExpr *n = makeNode(JoinExpr);
					n->jointype = JOIN_INNER;
					n->isNatural = FALSE;
					n->larg = $1;
					n->rarg = $4;
					n->using = NIL;
					n->quals = NULL;
					$$ = n;
				}
			| table_ref join_type JOIN table_ref join_qual
				{
					JoinExpr *n = makeNode(JoinExpr);
					n->jointype = $2;
					n->isNatural = FALSE;
					n->larg = $1;
					n->rarg = $4;
					if ($5 != NULL && IsA($5, List))
						n->using = (List *) $5; /* USING clause */
					else
						n->quals = $5; /* ON clause */
					$$ = n;
				}
			| table_ref JOIN table_ref join_qual
				{
					/* letting join_type reduce to empty doesn't work */
					JoinExpr *n = makeNode(JoinExpr);
					n->jointype = JOIN_INNER;
					n->isNatural = FALSE;
					n->larg = $1;
					n->rarg = $3;
					if ($4 != NULL && IsA($4, List))
						n->using = (List *) $4; /* USING clause */
					else
						n->quals = $4; /* ON clause */
					$$ = n;
				}
			| table_ref NATURAL join_type JOIN table_ref
				{
					JoinExpr *n = makeNode(JoinExpr);
					n->jointype = $3;
					n->isNatural = TRUE;
					n->larg = $1;
					n->rarg = $5;
					n->using = NIL; /* figure out which columns later... */
					n->quals = NULL; /* fill later */
					$$ = n;
				}
			| table_ref NATURAL JOIN table_ref
				{
					/* letting join_type reduce to empty doesn't work */
					JoinExpr *n = makeNode(JoinExpr);
					n->jointype = JOIN_INNER;
					n->isNatural = TRUE;
					n->larg = $1;
					n->rarg = $4;
					n->using = NIL; /* figure out which columns later... */
					n->quals = NULL; /* fill later */
					$$ = n;
				}
		;

alias_clause:
			AS ColId '(' name_list ')'
				{
					$$ = makeNode(Alias);
					$$->aliasname = $2;
					$$->colnames = $4;
				}
			| AS ColId
				{
					$$ = makeNode(Alias);
					$$->aliasname = $2;
				}
			| ColId '(' name_list ')'
				{
					$$ = makeNode(Alias);
					$$->aliasname = $1;
					$$->colnames = $3;
				}
			| ColId
				{
					$$ = makeNode(Alias);
					$$->aliasname = $1;
				}
		;

join_type:	FULL join_outer							{ $$ = JOIN_FULL; }
			| LEFT join_outer						{ $$ = JOIN_LEFT; }
			| RIGHT join_outer						{ $$ = JOIN_RIGHT; }
			| INNER_P								{ $$ = JOIN_INNER; }
		;

/* OUTER is just noise... */
join_outer: OUTER_P									{ $$ = NULL; }
			| /*EMPTY*/								{ $$ = NULL; }
		;

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

join_qual:	USING '(' name_list ')'					{ $$ = (Node *) $3; }
			| ON a_expr								{ $$ = $2; }
		;


relation_expr:
			qualified_name
				{
					/* default inheritance */
					$$ = $1;
					$$->inhOpt = INH_DEFAULT;
					$$->alias = NULL;
				}
			| qualified_name '*'
				{
					/* inheritance query */
					$$ = $1;
					$$->inhOpt = INH_YES;
					$$->alias = NULL;
				}
			| ONLY qualified_name
				{
					/* no inheritance */
					$$ = $2;
					$$->inhOpt = INH_NO;
					$$->alias = NULL;
				}
			| ONLY '(' qualified_name ')'
				{
					/* no inheritance, SQL99-style syntax */
					$$ = $3;
					$$->inhOpt = INH_NO;
					$$->alias = NULL;
				}
		;


/*
 * Given "UPDATE foo set set ...", we have to decide without looking any
 * further ahead whether the first "set" is an alias or the UPDATE's SET
 * keyword.  Since "set" is allowed as a column name both interpretations
 * are feasible.  We resolve the shift/reduce conflict by giving the first
 * relation_expr_opt_alias production a higher precedence than the SET token
 * has, causing the parser to prefer to reduce, in effect assuming that the
 * SET is not an alias.
 */
relation_expr_opt_alias: relation_expr					%prec UMINUS
				{
					$$ = $1;
				}
			| relation_expr ColId
				{
					Alias *alias = makeNode(Alias);
					alias->aliasname = $2;
					$1->alias = alias;
					$$ = $1;
				}
			| relation_expr AS ColId
				{
					Alias *alias = makeNode(Alias);
					alias->aliasname = $3;
					$1->alias = alias;
					$$ = $1;
				}
		;


func_table: func_expr								{ $$ = $1; }
		;


where_clause:
			WHERE a_expr							{ $$ = $2; }
			| /*EMPTY*/								{ $$ = NULL; }
		;


TableFuncElementList:
			TableFuncElement
				{
					$$ = list_make1($1);
				}
			| TableFuncElementList ',' TableFuncElement
				{
					$$ = lappend($1, $3);
				}
		;

TableFuncElement:	ColId Typename
				{
					ColumnDef *n = makeNode(ColumnDef);
					n->colname = $1;
					n->typename = $2;
					n->constraints = NIL;
					n->is_local = true;
					$$ = (Node *)n;
				}
		;

/*****************************************************************************
 *
 *	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:	SimpleTypename opt_array_bounds
				{
					$$ = $1;
					$$->arrayBounds = $2;
				}
			| SETOF SimpleTypename opt_array_bounds
				{
					$$ = $2;
					$$->arrayBounds = $3;
					$$->setof = TRUE;
				}
			| SimpleTypename ARRAY '[' Iconst ']'
				{
					/* SQL99's redundant syntax */
					$$ = $1;
					$$->arrayBounds = list_make1(makeInteger($4));
				}
			| SETOF SimpleTypename ARRAY '[' Iconst ']'
				{
					/* SQL99's redundant syntax */
					$$ = $2;
					$$->arrayBounds = list_make1(makeInteger($5));
					$$->setof = TRUE;
				}
		;

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

/*
 * XXX ideally, the production for a qualified typename should be ColId attrs
 * (there's no obvious reason why the first name should need to be restricted)
 * and should be an alternative of GenericType (so that it can be used to
 * specify a type for a literal in AExprConst).  However doing either causes
 * reduce/reduce conflicts that I haven't been able to find a workaround
 * for.  FIXME later.
 */
SimpleTypename:
			GenericType								{ $$ = $1; }
			| Numeric								{ $$ = $1; }
			| Bit									{ $$ = $1; }
			| Character								{ $$ = $1; }
			| ConstDatetime							{ $$ = $1; }
			| ConstInterval opt_interval
				{
					$$ = $1;
					if ($2 != INTERVAL_FULL_RANGE)
						$$->typmod = INTERVAL_TYPMOD(INTERVAL_FULL_PRECISION, $2);
				}
			| ConstInterval '(' Iconst ')' opt_interval
				{
					$$ = $1;
					if ($3 < 0)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision must not be negative",
										$3)));
					if ($3 > MAX_INTERVAL_PRECISION)
					{
						ereport(WARNING,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision reduced to maximum allowed, %d",
										$3, MAX_INTERVAL_PRECISION)));
						$3 = MAX_INTERVAL_PRECISION;
					}
					$$->typmod = INTERVAL_TYPMOD($3, $5);
				}
			| type_name attrs
				{
					$$ = makeNode(TypeName);
					$$->names = lcons(makeString($1), $2);
					$$->typmod = -1;
					$$->location = @1;
				}
		;

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

GenericType:
			type_name
				{
					$$ = makeTypeName($1);
					$$->location = @1;
				}
		;

/* SQL92 numeric data types
 * Check FLOAT() precision limits assuming IEEE floating types.
 * - thomas 1997-09-18
 * Provide real DECIMAL() and NUMERIC() implementations now - Jan 1998-12-30
 */
Numeric:	INT_P
				{
					$$ = SystemTypeName("int4");
				}
			| INTEGER
				{
					$$ = SystemTypeName("int4");
				}
			| SMALLINT
				{
					$$ = SystemTypeName("int2");
				}
			| BIGINT
				{
					$$ = SystemTypeName("int8");
				}
			| REAL
				{
					$$ = SystemTypeName("float4");
				}
			| FLOAT_P opt_float
				{
					$$ = $2;
				}
			| DOUBLE_P PRECISION
				{
					$$ = SystemTypeName("float8");
				}
			| DECIMAL_P opt_decimal
				{
					$$ = SystemTypeName("numeric");
					$$->typmod = $2;
				}
			| DEC opt_decimal
				{
					$$ = SystemTypeName("numeric");
					$$->typmod = $2;
				}
			| NUMERIC opt_numeric
				{
					$$ = SystemTypeName("numeric");
					$$->typmod = $2;
				}
			| BOOLEAN_P
				{
					$$ = SystemTypeName("bool");
				}
		;

opt_float:	'(' Iconst ')'
				{
					if ($2 < 1)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("precision for type float must be at least 1 bit")));
					else if ($2 <= 24)
						$$ = SystemTypeName("float4");
					else if ($2 <= 53)
						$$ = SystemTypeName("float8");
					else
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("precision for type float must be less than 54 bits")));
				}
			| /*EMPTY*/
				{
					$$ = SystemTypeName("float8");
				}
		;

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

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

					$$ = ($2 << 16) + VARHDRSZ;
				}
			| /*EMPTY*/
				{
					/* Insert "-1" meaning "no limit" */
					$$ = -1;
				}
		;

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

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

					$$ = ($2 << 16) + VARHDRSZ;
				}
			| /*EMPTY*/
				{
					/* Insert "-1" meaning "no limit" */
					$$ = -1;
				}
		;


/*
 * SQL92 bit-field data types
 * The following implements BIT() and BIT VARYING().
 */
Bit:		BitWithLength
				{
					$$ = $1;
				}
			| BitWithoutLength
				{
					$$ = $1;
				}
		;

/* ConstBit is like Bit except "BIT" defaults to unspecified length */
/* See notes for ConstCharacter, which addresses same issue for "CHAR" */
ConstBit:	BitWithLength
				{
					$$ = $1;
				}
			| BitWithoutLength
				{
					$$ = $1;
					$$->typmod = -1;
				}
		;

BitWithLength:
			BIT opt_varying '(' Iconst ')'
				{
					char *typname;

					typname = $2 ? "varbit" : "bit";
					$$ = SystemTypeName(typname);
					if ($4 < 1)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("length for type %s must be at least 1",
										typname)));
					else if ($4 > (MaxAttrSize * BITS_PER_BYTE))
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("length for type %s cannot exceed %d",
										typname, MaxAttrSize * BITS_PER_BYTE)));
					$$->typmod = $4;
				}
		;

BitWithoutLength:
			BIT opt_varying
				{
					/* bit defaults to bit(1), varbit to no limit */
					if ($2)
					{
						$$ = SystemTypeName("varbit");
						$$->typmod = -1;
					}
					else
					{
						$$ = SystemTypeName("bit");
						$$->typmod = 1;
					}
				}
		;


/*
 * SQL92 character data types
 * The following implements CHAR() and VARCHAR().
 */
Character:  CharacterWithLength
				{
					$$ = $1;
				}
			| CharacterWithoutLength
				{
					$$ = $1;
				}
		;

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

CharacterWithLength:  character '(' Iconst ')' opt_charset
				{
					if (($5 != NULL) && (strcmp($5, "sql_text") != 0))
					{
						char *type;

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

					$$ = SystemTypeName($1);

					if ($3 < 1)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("length for type %s must be at least 1",
										$1)));
					else if ($3 > MaxAttrSize)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("length for type %s cannot exceed %d",
										$1, MaxAttrSize)));

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

CharacterWithoutLength:	 character opt_charset
				{
					if (($2 != NULL) && (strcmp($2, "sql_text") != 0))
					{
						char *type;

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

					$$ = SystemTypeName($1);

					/* char defaults to char(1), varchar to no limit */
					if (strcmp($1, "bpchar") == 0)
						$$->typmod = VARHDRSZ + 1;
					else
						$$->typmod = -1;
				}
		;

character:	CHARACTER opt_varying
										{ $$ = $2 ? "varchar": "bpchar"; }
			| CHAR_P opt_varying
										{ $$ = $2 ? "varchar": "bpchar"; }
			| VARCHAR
										{ $$ = "varchar"; }
			| NATIONAL CHARACTER opt_varying
										{ $$ = $3 ? "varchar": "bpchar"; }
			| NATIONAL CHAR_P opt_varying
										{ $$ = $3 ? "varchar": "bpchar"; }
			| NCHAR opt_varying
										{ $$ = $2 ? "varchar": "bpchar"; }
		;

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

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

ConstDatetime:
			TIMESTAMP '(' Iconst ')' opt_timezone
				{
					if ($5)
						$$ = SystemTypeName("timestamptz");
					else
						$$ = SystemTypeName("timestamp");
					/* XXX the timezone field seems to be unused
					 * - thomas 2001-09-06
					 */
					$$->timezone = $5;
					if ($3 < 0)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("TIMESTAMP(%d)%s precision must not be negative",
										$3, ($5 ? " WITH TIME ZONE": ""))));
					if ($3 > MAX_TIMESTAMP_PRECISION)
					{
						ereport(WARNING,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("TIMESTAMP(%d)%s precision reduced to maximum allowed, %d",
										$3, ($5 ? " WITH TIME ZONE": ""),
										MAX_TIMESTAMP_PRECISION)));
						$3 = MAX_TIMESTAMP_PRECISION;
					}
					$$->typmod = $3;
				}
			| TIMESTAMP opt_timezone
				{
					if ($2)
						$$ = SystemTypeName("timestamptz");
					else
						$$ = SystemTypeName("timestamp");
					/* XXX the timezone field seems to be unused
					 * - thomas 2001-09-06
					 */
					$$->timezone = $2;
				}
			| TIME '(' Iconst ')' opt_timezone
				{
					if ($5)
						$$ = SystemTypeName("timetz");
					else
						$$ = SystemTypeName("time");
					if ($3 < 0)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("TIME(%d)%s precision must not be negative",
										$3, ($5 ? " WITH TIME ZONE": ""))));
					if ($3 > MAX_TIME_PRECISION)
					{
						ereport(WARNING,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("TIME(%d)%s precision reduced to maximum allowed, %d",
										$3, ($5 ? " WITH TIME ZONE": ""),
										MAX_TIME_PRECISION)));
						$3 = MAX_TIME_PRECISION;
					}
					$$->typmod = $3;
				}
			| TIME opt_timezone
				{
					if ($2)
						$$ = SystemTypeName("timetz");
					else
						$$ = SystemTypeName("time");
				}
		;

ConstInterval:
			INTERVAL								{ $$ = SystemTypeName("interval"); }
		;

opt_timezone:
			WITH TIME ZONE							{ $$ = TRUE; }
			| WITHOUT TIME ZONE						{ $$ = FALSE; }
			| /*EMPTY*/								{ $$ = FALSE; }
		;

opt_interval:
			YEAR_P									{ $$ = INTERVAL_MASK(YEAR); }
			| MONTH_P								{ $$ = INTERVAL_MASK(MONTH); }
			| DAY_P									{ $$ = INTERVAL_MASK(DAY); }
			| HOUR_P								{ $$ = INTERVAL_MASK(HOUR); }
			| MINUTE_P								{ $$ = INTERVAL_MASK(MINUTE); }
			| SECOND_P								{ $$ = INTERVAL_MASK(SECOND); }
			| YEAR_P TO MONTH_P
					{ $$ = INTERVAL_MASK(YEAR) | INTERVAL_MASK(MONTH); }
			| DAY_P TO HOUR_P
					{ $$ = INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR); }
			| DAY_P TO MINUTE_P
					{ $$ = INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR)
						| INTERVAL_MASK(MINUTE); }
			| DAY_P TO SECOND_P
					{ $$ = INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR)
						| INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND); }
			| HOUR_P TO MINUTE_P
					{ $$ = INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE); }
			| HOUR_P TO SECOND_P
					{ $$ = INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE)
						| INTERVAL_MASK(SECOND); }
			| MINUTE_P TO SECOND_P
					{ $$ = INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND); }
			| /*EMPTY*/								{ $$ = INTERVAL_FULL_RANGE; }
		;


/*****************************************************************************
 *
 *	expression grammar
 *
 *****************************************************************************/

/*
 * General expressions
 * This is the heart of the expression syntax.
 *
 * We have two expression types: a_expr is the unrestricted kind, and
 * b_expr is a subset that must be used in some places to avoid shift/reduce
 * conflicts.  For example, we can't do BETWEEN as "BETWEEN a_expr AND a_expr"
 * because that use of AND conflicts with AND as a boolean operator.  So,
 * b_expr is used in BETWEEN and we remove boolean keywords from b_expr.
 *
 * Note that '(' a_expr ')' is a b_expr, so an unrestricted expression can
 * always be used by surrounding it with parens.
 *
 * c_expr is all the productions that are common to a_expr and b_expr;
 * it's factored out just to eliminate redundant coding.
 */
a_expr:		c_expr									{ $$ = $1; }
			| a_expr TYPECAST Typename
					{ $$ = makeTypeCast($1, $3); }
			| a_expr AT TIME ZONE a_expr
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("timezone");
					n->args = list_make2($5, $1);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @2;
					$$ = (Node *) n;
				}
		/*
		 * These operators must be called out explicitly in order to make use
		 * of yacc/bison's automatic operator-precedence handling.  All other
		 * operator names are handled by the generic productions using "Op",
		 * below; and all those operators will have the same precedence.
		 *
		 * If you add more explicitly-known operators, be sure to add them
		 * also to b_expr and to the MathOp list above.
		 */
			| '+' a_expr					%prec UMINUS
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "+", NULL, $2, @1); }
			| '-' a_expr					%prec UMINUS
				{ $$ = doNegate($2, @1); }
			| a_expr '+' a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "+", $1, $3, @2); }
			| a_expr '-' a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "-", $1, $3, @2); }
			| a_expr '*' a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "*", $1, $3, @2); }
			| a_expr '/' a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "/", $1, $3, @2); }
			| a_expr '%' a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "%", $1, $3, @2); }
			| a_expr '^' a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "^", $1, $3, @2); }
			| a_expr '<' a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $3, @2); }
			| a_expr '>' a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $3, @2); }
			| a_expr '=' a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "=", $1, $3, @2); }

			| a_expr qual_Op a_expr				%prec Op
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $2, $1, $3, @2); }
			| qual_Op a_expr					%prec Op
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $1, NULL, $2, @1); }
			| a_expr qual_Op					%prec POSTFIXOP
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $2, $1, NULL, @2); }

			| a_expr AND a_expr
				{ $$ = (Node *) makeA_Expr(AEXPR_AND, NIL, $1, $3, @2); }
			| a_expr OR a_expr
				{ $$ = (Node *) makeA_Expr(AEXPR_OR, NIL, $1, $3, @2); }
			| NOT a_expr
				{ $$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL, $2, @1); }

			| a_expr LIKE a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~~", $1, $3, @2); }
			| a_expr LIKE a_expr ESCAPE a_expr
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("like_escape");
					n->args = list_make2($3, $5);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @4;
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~~", $1, (Node *) n, @2);
				}
			| a_expr NOT LIKE a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~~", $1, $4, @2); }
			| a_expr NOT LIKE a_expr ESCAPE a_expr
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("like_escape");
					n->args = list_make2($4, $6);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @5;
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~~", $1, (Node *) n, @2);
				}
			| a_expr ILIKE a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~~*", $1, $3, @2); }
			| a_expr ILIKE a_expr ESCAPE a_expr
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("like_escape");
					n->args = list_make2($3, $5);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @4;
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~~*", $1, (Node *) n, @2);
				}
			| a_expr NOT ILIKE a_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~~*", $1, $4, @2); }
			| a_expr NOT ILIKE a_expr ESCAPE a_expr
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("like_escape");
					n->args = list_make2($4, $6);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @5;
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~~*", $1, (Node *) n, @2);
				}

			| a_expr SIMILAR TO a_expr				%prec SIMILAR
				{
					A_Const *c = makeNode(A_Const);
					FuncCall *n = makeNode(FuncCall);
					c->val.type = T_Null;
					n->funcname = SystemFuncName("similar_escape");
					n->args = list_make2($4, (Node *) c);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @2;
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~", $1, (Node *) n, @2);
				}
			| a_expr SIMILAR TO a_expr ESCAPE a_expr
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("similar_escape");
					n->args = list_make2($4, $6);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @5;
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "~", $1, (Node *) n, @2);
				}
			| a_expr NOT SIMILAR TO a_expr			%prec SIMILAR
				{
					A_Const *c = makeNode(A_Const);
					FuncCall *n = makeNode(FuncCall);
					c->val.type = T_Null;
					n->funcname = SystemFuncName("similar_escape");
					n->args = list_make2($5, (Node *) c);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @5;
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~", $1, (Node *) n, @2);
				}
			| a_expr NOT SIMILAR TO a_expr ESCAPE a_expr
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("similar_escape");
					n->args = list_make2($5, $7);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @6;
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "!~", $1, (Node *) n, @2);
				}

			/* NullTest clause
			 * Define SQL92-style Null test clause.
			 * Allow two forms described in the standard:
			 *	a IS NULL
			 *	a IS NOT NULL
			 * Allow two SQL extensions
			 *	a ISNULL
			 *	a NOTNULL
			 */
			| a_expr IS NULL_P
				{
					NullTest *n = makeNode(NullTest);
					n->arg = (Expr *) $1;
					n->nulltesttype = IS_NULL;
					$$ = (Node *)n;
				}
			| a_expr ISNULL
				{
					NullTest *n = makeNode(NullTest);
					n->arg = (Expr *) $1;
					n->nulltesttype = IS_NULL;
					$$ = (Node *)n;
				}
			| a_expr IS NOT NULL_P
				{
					NullTest *n = makeNode(NullTest);
					n->arg = (Expr *) $1;
					n->nulltesttype = IS_NOT_NULL;
					$$ = (Node *)n;
				}
			| a_expr NOTNULL
				{
					NullTest *n = makeNode(NullTest);
					n->arg = (Expr *) $1;
					n->nulltesttype = IS_NOT_NULL;
					$$ = (Node *)n;
				}
			| row OVERLAPS row
				{
					$$ = (Node *)makeOverlaps($1, $3, @2);
				}
			| a_expr IS TRUE_P
				{
					BooleanTest *b = makeNode(BooleanTest);
					b->arg = (Expr *) $1;
					b->booltesttype = IS_TRUE;
					$$ = (Node *)b;
				}
			| a_expr IS NOT TRUE_P
				{
					BooleanTest *b = makeNode(BooleanTest);
					b->arg = (Expr *) $1;
					b->booltesttype = IS_NOT_TRUE;
					$$ = (Node *)b;
				}
			| a_expr IS FALSE_P
				{
					BooleanTest *b = makeNode(BooleanTest);
					b->arg = (Expr *) $1;
					b->booltesttype = IS_FALSE;
					$$ = (Node *)b;
				}
			| a_expr IS NOT FALSE_P
				{
					BooleanTest *b = makeNode(BooleanTest);
					b->arg = (Expr *) $1;
					b->booltesttype = IS_NOT_FALSE;
					$$ = (Node *)b;
				}
			| a_expr IS UNKNOWN
				{
					BooleanTest *b = makeNode(BooleanTest);
					b->arg = (Expr *) $1;
					b->booltesttype = IS_UNKNOWN;
					$$ = (Node *)b;
				}
			| a_expr IS NOT UNKNOWN
				{
					BooleanTest *b = makeNode(BooleanTest);
					b->arg = (Expr *) $1;
					b->booltesttype = IS_NOT_UNKNOWN;
					$$ = (Node *)b;
				}
			| a_expr IS DISTINCT FROM a_expr			%prec IS
				{
					$$ = (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=", $1, $5, @2);
				}
			| a_expr IS NOT DISTINCT FROM a_expr		%prec IS
				{
					$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL,
									(Node *) makeSimpleA_Expr(AEXPR_DISTINCT,
															  "=", $1, $6, @2),
											 @2);

				}
			| a_expr IS OF '(' type_list ')'			%prec IS
				{
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "=", $1, (Node *) $5, @2);
				}
			| a_expr IS NOT OF '(' type_list ')'		%prec IS
				{
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "<>", $1, (Node *) $6, @2);
				}
			| a_expr BETWEEN opt_asymmetric b_expr AND b_expr		%prec BETWEEN
				{
					$$ = (Node *) makeA_Expr(AEXPR_AND, NIL,
						(Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $4, @2),
						(Node *) makeSimpleA_Expr(AEXPR_OP, "<=", $1, $6, @2),
											 @2);
				}
			| a_expr NOT BETWEEN opt_asymmetric b_expr AND b_expr	%prec BETWEEN
				{
					$$ = (Node *) makeA_Expr(AEXPR_OR, NIL,
						(Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $5, @2),
						(Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $7, @2),
											 @2);
				}
			| a_expr BETWEEN SYMMETRIC b_expr AND b_expr			%prec BETWEEN
				{
					$$ = (Node *) makeA_Expr(AEXPR_OR, NIL,
						(Node *) makeA_Expr(AEXPR_AND, NIL,
						    (Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $4, @2),
						    (Node *) makeSimpleA_Expr(AEXPR_OP, "<=", $1, $6, @2),
											@2),
						(Node *) makeA_Expr(AEXPR_AND, NIL,
						    (Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $6, @2),
						    (Node *) makeSimpleA_Expr(AEXPR_OP, "<=", $1, $4, @2),
											@2),
											 @2);
				}
			| a_expr NOT BETWEEN SYMMETRIC b_expr AND b_expr		%prec BETWEEN
				{
					$$ = (Node *) makeA_Expr(AEXPR_AND, NIL,
						(Node *) makeA_Expr(AEXPR_OR, NIL,
						    (Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $5, @2),
						    (Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $7, @2),
											@2),
						(Node *) makeA_Expr(AEXPR_OR, NIL,
						    (Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $7, @2),
						    (Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $5, @2),
											@2),
											 @2);
				}
			| a_expr IN_P in_expr
				{
					/* in_expr returns a SubLink or a list of a_exprs */
					if (IsA($3, SubLink))
					{
						/* generate foo = ANY (subquery) */
						SubLink *n = (SubLink *) $3;
						n->subLinkType = ANY_SUBLINK;
						n->testexpr = $1;
						n->operName = list_make1(makeString("="));
						$$ = (Node *)n;
					}
					else
					{
						/* generate scalar IN expression */
						$$ = (Node *) makeSimpleA_Expr(AEXPR_IN, "=", $1, $3, @2);
					}
				}
			| a_expr NOT IN_P in_expr
				{
					/* in_expr returns a SubLink or a list of a_exprs */
					if (IsA($4, SubLink))
					{
						/* generate NOT (foo = ANY (subquery)) */
						/* Make an = ANY node */
						SubLink *n = (SubLink *) $4;
						n->subLinkType = ANY_SUBLINK;
						n->testexpr = $1;
						n->operName = list_make1(makeString("="));
						/* Stick a NOT on top */
						$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL, (Node *) n, @2);
					}
					else
					{
						/* generate scalar NOT IN expression */
						$$ = (Node *) makeSimpleA_Expr(AEXPR_IN, "<>", $1, $4, @2);
					}
				}
			| a_expr subquery_Op sub_type select_with_parens	%prec Op
				{
					SubLink *n = makeNode(SubLink);
					n->subLinkType = $3;
					n->testexpr = $1;
					n->operName = $2;
					n->subselect = $4;
					$$ = (Node *)n;
				}
			| a_expr subquery_Op sub_type '(' a_expr ')'		%prec Op
				{
					if ($3 == ANY_SUBLINK)
						$$ = (Node *) makeA_Expr(AEXPR_OP_ANY, $2, $1, $5, @2);
					else
						$$ = (Node *) makeA_Expr(AEXPR_OP_ALL, $2, $1, $5, @2);
				}
			| UNIQUE select_with_parens
				{
					/* Not sure how to get rid of the parentheses
					 * but there are lots of shift/reduce errors without them.
					 *
					 * Should be able to implement this by plopping the entire
					 * select into a node, then transforming the target expressions
					 * from whatever they are into count(*), and testing the
					 * entire result equal to one.
					 * But, will probably implement a separate node in the executor.
					 */
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("UNIQUE predicate is not yet implemented")));
				}
		;

/*
 * Restricted expressions
 *
 * b_expr is a subset of the complete expression syntax defined by a_expr.
 *
 * Presently, AND, NOT, IS, and IN are the a_expr keywords that would
 * cause trouble in the places where b_expr is used.  For simplicity, we
 * just eliminate all the boolean-keyword-operator productions from b_expr.
 */
b_expr:		c_expr
				{ $$ = $1; }
			| b_expr TYPECAST Typename
				{ $$ = makeTypeCast($1, $3); }
			| '+' b_expr					%prec UMINUS
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "+", NULL, $2, @1); }
			| '-' b_expr					%prec UMINUS
				{ $$ = doNegate($2, @1); }
			| b_expr '+' b_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "+", $1, $3, @2); }
			| b_expr '-' b_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "-", $1, $3, @2); }
			| b_expr '*' b_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "*", $1, $3, @2); }
			| b_expr '/' b_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "/", $1, $3, @2); }
			| b_expr '%' b_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "%", $1, $3, @2); }
			| b_expr '^' b_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "^", $1, $3, @2); }
			| b_expr '<' b_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $3, @2); }
			| b_expr '>' b_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $3, @2); }
			| b_expr '=' b_expr
				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "=", $1, $3, @2); }
			| b_expr qual_Op b_expr				%prec Op
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $2, $1, $3, @2); }
			| qual_Op b_expr					%prec Op
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $1, NULL, $2, @1); }
			| b_expr qual_Op					%prec POSTFIXOP
				{ $$ = (Node *) makeA_Expr(AEXPR_OP, $2, $1, NULL, @2); }
			| b_expr IS DISTINCT FROM b_expr		%prec IS
				{
					$$ = (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=", $1, $5, @2);
				}
			| b_expr IS NOT DISTINCT FROM b_expr	%prec IS
				{
					$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL,
						NULL, (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=", $1, $6, @2), @2);
				}
			| b_expr IS OF '(' type_list ')'		%prec IS
				{
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "=", $1, (Node *) $5, @2);
				}
			| b_expr IS NOT OF '(' type_list ')'	%prec IS
				{
					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "<>", $1, (Node *) $6, @2);
				}
		;

/*
 * Productions that can be used in both a_expr and b_expr.
 *
 * Note: productions that refer recursively to a_expr or b_expr mostly
 * cannot appear here.	However, it's OK to refer to a_exprs that occur
 * inside parentheses, such as function arguments; that cannot introduce
 * ambiguity to the b_expr syntax.
 */
c_expr:		columnref								{ $$ = $1; }
			| AexprConst							{ $$ = $1; }
			| PARAM opt_indirection
				{
					ParamRef *p = makeNode(ParamRef);
					p->number = $1;
					if ($2)
					{
						A_Indirection *n = makeNode(A_Indirection);
						n->arg = (Node *) p;
						n->indirection = $2;
						$$ = (Node *) n;
					}
					else
						$$ = (Node *) p;
				}
			| '(' a_expr ')' opt_indirection
				{
					if ($4)
					{
						A_Indirection *n = makeNode(A_Indirection);
						n->arg = $2;
						n->indirection = $4;
						$$ = (Node *)n;
					}
					else
						$$ = $2;
				}
			| case_expr
				{ $$ = $1; }
			| func_expr
				{ $$ = $1; }
			| select_with_parens			%prec UMINUS
				{
					SubLink *n = makeNode(SubLink);
					n->subLinkType = EXPR_SUBLINK;
					n->testexpr = NULL;
					n->operName = NIL;
					n->subselect = $1;
					$$ = (Node *)n;
				}
			| EXISTS select_with_parens
				{
					SubLink *n = makeNode(SubLink);
					n->subLinkType = EXISTS_SUBLINK;
					n->testexpr = NULL;
					n->operName = NIL;
					n->subselect = $2;
					$$ = (Node *)n;
				}
			| ARRAY select_with_parens
				{
					SubLink *n = makeNode(SubLink);
					n->subLinkType = ARRAY_SUBLINK;
					n->testexpr = NULL;
					n->operName = NIL;
					n->subselect = $2;
					$$ = (Node *)n;
				}
			| ARRAY array_expr
				{	$$ = $2;	}
			| row
				{
					RowExpr *r = makeNode(RowExpr);
					r->args = $1;
					r->row_typeid = InvalidOid;	/* not analyzed yet */
					$$ = (Node *)r;
				}
		;

/*
 * func_expr is split out from c_expr just so that we have a classification
 * for "everything that is a function call or looks like one".  This isn't
 * very important, but it saves us having to document which variants are
 * legal in the backwards-compatible functional-index syntax for CREATE INDEX.
 * (Note that many of the special SQL functions wouldn't actually make any
 * sense as functional index entries, but we ignore that consideration here.)
 */
func_expr:	func_name '(' ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| func_name '(' expr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| func_name '(' ALL expr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $4;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					/* Ideally we'd mark the FuncCall node to indicate
					 * "must be an aggregate", but there's no provision
					 * for that in FuncCall at the moment.
					 */
					n->location = @1;
					$$ = (Node *)n;
				}
			| func_name '(' DISTINCT expr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = $4;
					n->agg_star = FALSE;
					n->agg_distinct = TRUE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| func_name '(' '*' ')'
				{
					/*
					 * We consider AGGREGATE(*) to invoke a parameterless
					 * aggregate.  This does the right thing for COUNT(*),
					 * and there are no other aggregates in SQL92 that accept
					 * '*' as parameter.
					 *
					 * The FuncCall node is also marked agg_star = true,
					 * so that later processing can detect what the argument
					 * really was.
					 */
					FuncCall *n = makeNode(FuncCall);
					n->funcname = $1;
					n->args = NIL;
					n->agg_star = TRUE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| CURRENT_DATE
				{
					/*
					 * Translate as "'now'::text::date".
					 *
					 * We cannot use "'now'::date" because coerce_type() will
					 * immediately reduce that to a constant representing
					 * today's date.  We need to delay the conversion until
					 * runtime, else the wrong things will happen when
					 * CURRENT_DATE is used in a column default value or rule.
					 *
					 * This could be simplified if we had a way to generate
					 * an expression tree representing runtime application
					 * of type-input conversion functions.  (As of PG 7.3
					 * that is actually possible, but not clear that we want
					 * to rely on it.)
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

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

					d = SystemTypeName("date");

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
			| CURRENT_TIME
				{
					/*
					 * Translate as "'now'::text::timetz".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

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

					d = SystemTypeName("timetz");

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
			| CURRENT_TIME '(' Iconst ')'
				{
					/*
					 * Translate as "'now'::text::timetz(n)".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

					s->val.type = T_String;
					s->val.val.str = "now";
					s->typename = SystemTypeName("text");
					d = SystemTypeName("timetz");
					if ($3 < 0)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("CURRENT_TIME(%d) precision must not be negative",
										$3)));
					if ($3 > MAX_TIME_PRECISION)
					{
						ereport(WARNING,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("CURRENT_TIME(%d) precision reduced to maximum allowed, %d",
										$3, MAX_TIME_PRECISION)));
						$3 = MAX_TIME_PRECISION;
					}
					d->typmod = $3;

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
			| CURRENT_TIMESTAMP
				{
					/*
					 * Translate as "now()", since we have a function that
					 * does exactly what is needed.
					 */
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("now");
					n->args = NIL;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| CURRENT_TIMESTAMP '(' Iconst ')'
				{
					/*
					 * Translate as "'now'::text::timestamptz(n)".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

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

					d = SystemTypeName("timestamptz");
					if ($3 < 0)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("CURRENT_TIMESTAMP(%d) precision must not be negative",
										$3)));
					if ($3 > MAX_TIMESTAMP_PRECISION)
					{
						ereport(WARNING,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("CURRENT_TIMESTAMP(%d) precision reduced to maximum allowed, %d",
										$3, MAX_TIMESTAMP_PRECISION)));
						$3 = MAX_TIMESTAMP_PRECISION;
					}
					d->typmod = $3;

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
			| LOCALTIME
				{
					/*
					 * Translate as "'now'::text::time".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

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

					d = SystemTypeName("time");

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
			| LOCALTIME '(' Iconst ')'
				{
					/*
					 * Translate as "'now'::text::time(n)".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

					s->val.type = T_String;
					s->val.val.str = "now";
					s->typename = SystemTypeName("text");
					d = SystemTypeName("time");
					if ($3 < 0)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("LOCALTIME(%d) precision must not be negative",
										$3)));
					if ($3 > MAX_TIME_PRECISION)
					{
						ereport(WARNING,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("LOCALTIME(%d) precision reduced to maximum allowed, %d",
										$3, MAX_TIME_PRECISION)));
						$3 = MAX_TIME_PRECISION;
					}
					d->typmod = $3;

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
			| LOCALTIMESTAMP
				{
					/*
					 * Translate as "'now'::text::timestamp".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

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

					d = SystemTypeName("timestamp");

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
			| LOCALTIMESTAMP '(' Iconst ')'
				{
					/*
					 * Translate as "'now'::text::timestamp(n)".
					 * See comments for CURRENT_DATE.
					 */
					A_Const *s = makeNode(A_Const);
					TypeName *d;

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

					d = SystemTypeName("timestamp");
					if ($3 < 0)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("LOCALTIMESTAMP(%d) precision must not be negative",
										$3)));
					if ($3 > MAX_TIMESTAMP_PRECISION)
					{
						ereport(WARNING,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("LOCALTIMESTAMP(%d) precision reduced to maximum allowed, %d",
										$3, MAX_TIMESTAMP_PRECISION)));
						$3 = MAX_TIMESTAMP_PRECISION;
					}
					d->typmod = $3;

					$$ = (Node *)makeTypeCast((Node *)s, d);
				}
			| CURRENT_ROLE
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("current_user");
					n->args = NIL;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| CURRENT_USER
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("current_user");
					n->args = NIL;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| SESSION_USER
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("session_user");
					n->args = NIL;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| USER
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("current_user");
					n->args = NIL;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| CAST '(' a_expr AS Typename ')'
				{ $$ = makeTypeCast($3, $5); }
			| EXTRACT '(' extract_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("date_part");
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| OVERLAY '(' overlay_list ')'
				{
					/* overlay(A PLACING B FROM C FOR D) is converted to
					 * substring(A, 1, C-1) || B || substring(A, C+1, C+D)
					 * overlay(A PLACING B FROM C) is converted to
					 * substring(A, 1, C-1) || B || substring(A, C+1, C+char_length(B))
					 */
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("overlay");
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| POSITION '(' position_list ')'
				{
					/* position(A in B) is converted to position(B, A) */
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("position");
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| SUBSTRING '(' substr_list ')'
				{
					/* substring(A from B for C) is converted to
					 * substring(A, B, C) - thomas 2000-11-28
					 */
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("substring");
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| TREAT '(' a_expr AS Typename ')'
				{
					/* TREAT(expr AS target) converts expr of a particular type to target,
					 * which is defined to be a subtype of the original expression.
					 * In SQL99, this is intended for use with structured UDTs,
					 * but let's make this a generally useful form allowing stronger
					 * coercions than are handled by implicit casting.
					 */
					FuncCall *n = makeNode(FuncCall);
					/* Convert SystemTypeName() to SystemFuncName() even though
					 * at the moment they result in the same thing.
					 */
					n->funcname = SystemFuncName(((Value *)llast($5->names))->val.str);
					n->args = list_make1($3);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| TRIM '(' BOTH trim_list ')'
				{
					/* various trim expressions are defined in SQL92
					 * - thomas 1997-07-19
					 */
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("btrim");
					n->args = $4;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| TRIM '(' LEADING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("ltrim");
					n->args = $4;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| TRIM '(' TRAILING trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("rtrim");
					n->args = $4;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| TRIM '(' trim_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("btrim");
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| CONVERT '(' a_expr USING any_name ')'
				{
					FuncCall *n = makeNode(FuncCall);
					A_Const *c = makeNode(A_Const);

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

					n->funcname = SystemFuncName("convert_using");
					n->args = list_make2($3, c);
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| CONVERT '(' expr_list ')'
				{
					FuncCall *n = makeNode(FuncCall);
					n->funcname = SystemFuncName("convert");
					n->args = $3;
					n->agg_star = FALSE;
					n->agg_distinct = FALSE;
					n->location = @1;
					$$ = (Node *)n;
				}
			| NULLIF '(' a_expr ',' a_expr ')'
				{
					$$ = (Node *) makeSimpleA_Expr(AEXPR_NULLIF, "=", $3, $5, @1);
				}
			| COALESCE '(' expr_list ')'
				{
					CoalesceExpr *c = makeNode(CoalesceExpr);
					c->args = $3;
					$$ = (Node *)c;
				}
			| GREATEST '(' expr_list ')'
				{
					MinMaxExpr *v = makeNode(MinMaxExpr);
					v->args = $3;
					v->op = IS_GREATEST;
					$$ = (Node *)v;
				}
			| LEAST '(' expr_list ')'
				{
					MinMaxExpr *v = makeNode(MinMaxExpr);
					v->args = $3;
					v->op = IS_LEAST;
					$$ = (Node *)v;
				}
		;

/*
 * Supporting nonterminals for expressions.
 */

/* Explicit row production.
 *
 * SQL99 allows an optional ROW keyword, so we can now do single-element rows
 * without conflicting with the parenthesized a_expr production.  Without the
 * ROW keyword, there must be more than one a_expr inside the parens.
 */
row:		ROW '(' expr_list ')'					{ $$ = $3; }
			| ROW '(' ')'							{ $$ = NIL; }
			| '(' expr_list ',' a_expr ')'			{ $$ = lappend($2, $4); }
		;

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

all_Op:		Op										{ $$ = $1; }
			| MathOp								{ $$ = $1; }
		;

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

qual_Op:	Op
					{ $$ = list_make1(makeString($1)); }
			| OPERATOR '(' any_operator ')'
					{ $$ = $3; }
		;

qual_all_Op:
			all_Op
					{ $$ = list_make1(makeString($1)); }
			| OPERATOR '(' any_operator ')'
					{ $$ = $3; }
		;

subquery_Op:
			all_Op
					{ $$ = list_make1(makeString($1)); }
			| OPERATOR '(' any_operator ')'
					{ $$ = $3; }
			| LIKE
					{ $$ = list_make1(makeString("~~")); }
			| NOT LIKE
					{ $$ = list_make1(makeString("!~~")); }
			| ILIKE
					{ $$ = list_make1(makeString("~~*")); }
			| NOT ILIKE
					{ $$ = list_make1(makeString("!~~*")); }
/* cannot put SIMILAR TO here, because SIMILAR TO is a hack.
 * the regular expression is preprocessed by a function (similar_escape),
 * and the ~ operator for posix regular expressions is used.
 *        x SIMILAR TO y     ->    x ~ similar_escape(y)
 * this transformation is made on the fly by the parser upwards.
 * however the SubLink structure which handles any/some/all stuff
 * is not ready for such a thing.
 */
			;

expr_list:	a_expr
				{
					$$ = list_make1($1);
				}
			| expr_list ',' a_expr
				{
					$$ = lappend($1, $3);
				}
		;

extract_list:
			extract_arg FROM a_expr
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = $1;
					$$ = list_make2((Node *) n, $3);
				}
			| /*EMPTY*/								{ $$ = NIL; }
		;

type_list:  type_list ',' Typename
				{
					$$ = lappend($1, $3);
				}
			| Typename
				{
					$$ = list_make1($1);
				}
		;

array_expr_list: array_expr
				{	$$ = list_make1($1);		}
			| array_expr_list ',' array_expr
				{	$$ = lappend($1, $3);	}
		;

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

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

extract_arg:
			IDENT									{ $$ = $1; }
			| YEAR_P								{ $$ = "year"; }
			| MONTH_P								{ $$ = "month"; }
			| DAY_P									{ $$ = "day"; }
			| HOUR_P								{ $$ = "hour"; }
			| MINUTE_P								{ $$ = "minute"; }
			| SECOND_P								{ $$ = "second"; }
			| SCONST								{ $$ = $1; }
		;

/* OVERLAY() arguments
 * SQL99 defines the OVERLAY() function:
 * o overlay(text placing text from int for int)
 * o overlay(text placing text from int)
 */
overlay_list:
			a_expr overlay_placing substr_from substr_for
				{
					$$ = list_make4($1, $2, $3, $4);
				}
			| a_expr overlay_placing substr_from
				{
					$$ = list_make3($1, $2, $3);
				}
		;

overlay_placing:
			PLACING a_expr
				{ $$ = $2; }
		;

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

position_list:
			b_expr IN_P b_expr						{ $$ = list_make2($3, $1); }
			| /*EMPTY*/								{ $$ = NIL; }
		;

/* SUBSTRING() arguments
 * SQL9x defines a specific syntax for arguments to SUBSTRING():
 * o substring(text from int for int)
 * o substring(text from int) get entire string from starting point "int"
 * o substring(text for int) get first "int" characters of string
 * o substring(text from pattern) get entire string matching pattern
 * o substring(text from pattern for escape) same with specified escape char
 * We also want to support generic substring functions which accept
 * the usual generic list of arguments. So we will accept both styles
 * here, and convert the SQL9x style to the generic list for further
 * processing. - thomas 2000-11-28
 */
substr_list:
			a_expr substr_from substr_for
				{
					$$ = list_make3($1, $2, $3);
				}
			| a_expr substr_for substr_from
				{
					/* not legal per SQL99, but might as well allow it */
					$$ = list_make3($1, $3, $2);
				}
			| a_expr substr_from
				{
					$$ = list_make2($1, $2);
				}
			| a_expr substr_for
				{
					/*
					 * Since there are no cases where this syntax allows
					 * a textual FOR value, we forcibly cast the argument
					 * to int4.  This is a kluge to avoid surprising results
					 * when the argument is, say, int8.  It'd be better if
					 * there were not an implicit cast from int8 to text ...
					 */
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Integer;
					n->val.val.ival = 1;
					$$ = list_make3($1, (Node *) n,
									makeTypeCast($2, SystemTypeName("int4")));
				}
			| expr_list
				{
					$$ = $1;
				}
			| /*EMPTY*/
				{ $$ = NIL; }
		;

substr_from:
			FROM a_expr								{ $$ = $2; }
		;

substr_for: FOR a_expr								{ $$ = $2; }
		;

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

in_expr:	select_with_parens
				{
					SubLink *n = makeNode(SubLink);
					n->subselect = $1;
					/* other fields will be filled later */
					$$ = (Node *)n;
				}
			| '(' expr_list ')'						{ $$ = (Node *)$2; }
		;

/*
 * Define SQL92-style case clause.
 * - Full specification
 *	CASE WHEN a = b THEN c ... ELSE d END
 * - Implicit argument
 *	CASE a WHEN b THEN c ... ELSE d END
 */
case_expr:	CASE case_arg when_clause_list case_default END_P
				{
					CaseExpr *c = makeNode(CaseExpr);
					c->casetype = InvalidOid; /* not analyzed yet */
					c->arg = (Expr *) $2;
					c->args = $3;
					c->defresult = (Expr *) $4;
					$$ = (Node *)c;
				}
		;

when_clause_list:
			/* There must be at least one */
			when_clause								{ $$ = list_make1($1); }
			| when_clause_list when_clause			{ $$ = lappend($1, $2); }
		;

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

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

case_arg:	a_expr									{ $$ = $1; }
			| /*EMPTY*/								{ $$ = NULL; }
		;

/*
 * columnref starts with relation_name not ColId, so that OLD and NEW
 * references can be accepted.	Note that when there are more than two
 * dotted names, the first name is not actually a relation name...
 */
columnref:	relation_name
				{
					$$ = makeColumnRef($1, NIL, @1);
				}
			| relation_name indirection
				{
					$$ = makeColumnRef($1, $2, @1);
				}
		;

indirection_el:
			'.' attr_name
				{
					$$ = (Node *) makeString($2);
				}
			| '.' '*'
				{
					$$ = (Node *) makeString("*");
				}
			| '[' a_expr ']'
				{
					A_Indices *ai = makeNode(A_Indices);
					ai->lidx = NULL;
					ai->uidx = $2;
					$$ = (Node *) ai;
				}
			| '[' a_expr ':' a_expr ']'
				{
					A_Indices *ai = makeNode(A_Indices);
					ai->lidx = $2;
					ai->uidx = $4;
					$$ = (Node *) ai;
				}
		;

indirection:
			indirection_el							{ $$ = list_make1($1); }
			| indirection indirection_el			{ $$ = lappend($1, $2); }
		;

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

opt_asymmetric: ASYMMETRIC
			| /*EMPTY*/
		;

/*
 * The SQL spec defines "contextually typed value expressions" and
 * "contextually typed row value constructors", which for our purposes
 * are the same as "a_expr" and "row" except that DEFAULT can appear at
 * the top level.
 */

ctext_expr:
			a_expr					{ $$ = (Node *) $1; }
			| DEFAULT				{ $$ = (Node *) makeNode(SetToDefault); }
		;

ctext_expr_list:
			ctext_expr								{ $$ = list_make1($1); }
			| ctext_expr_list ',' ctext_expr		{ $$ = lappend($1, $3); }
		;

/*
 * We should allow ROW '(' ctext_expr_list ')' too, but that seems to require
 * making VALUES a fully reserved word, which will probably break more apps
 * than allowing the noise-word is worth.
 */
ctext_row: '(' ctext_expr_list ')'					{ $$ = $2; }
		;


/*****************************************************************************
 *
 *	target list for SELECT
 *
 *****************************************************************************/

target_list:
			target_el								{ $$ = list_make1($1); }
			| target_list ',' target_el				{ $$ = lappend($1, $3); }
		;

/* AS is not optional because shift/red conflict with unary ops */
target_el:	a_expr AS ColLabel
				{
					$$ = makeNode(ResTarget);
					$$->name = $3;
					$$->indirection = NIL;
					$$->val = (Node *)$1;
					$$->location = @1;
				}
			| a_expr
				{
					$$ = makeNode(ResTarget);
					$$->name = NULL;
					$$->indirection = NIL;
					$$->val = (Node *)$1;
					$$->location = @1;
				}
			| '*'
				{
					ColumnRef *n = makeNode(ColumnRef);
					n->fields = list_make1(makeString("*"));
					n->location = @1;

					$$ = makeNode(ResTarget);
					$$->name = NULL;
					$$->indirection = NIL;
					$$->val = (Node *)n;
					$$->location = @1;
				}
		;


/*****************************************************************************
 *
 *	Names and constants
 *
 *****************************************************************************/

relation_name:
			SpecialRuleRelation						{ $$ = $1; }
			| ColId									{ $$ = $1; }
		;

qualified_name_list:
			qualified_name							{ $$ = list_make1($1); }
			| qualified_name_list ',' qualified_name { $$ = lappend($1, $3); }
		;

/*
 * The production for a qualified relation name has to exactly match the
 * production for a qualified func_name, because in a FROM clause we cannot
 * tell which we are parsing until we see what comes after it ('(' for a
 * func_name, something else for a relation). Therefore we allow 'indirection'
 * which may contain subscripts, and reject that case in the C code.
 */
qualified_name:
			relation_name
				{
					$$ = makeNode(RangeVar);
					$$->catalogname = NULL;
					$$->schemaname = NULL;
					$$->relname = $1;
				}
			| relation_name indirection
				{
					check_qualified_name($2);
					$$ = makeNode(RangeVar);
					switch (list_length($2))
					{
						case 1:
							$$->catalogname = NULL;
							$$->schemaname = $1;
							$$->relname = strVal(linitial($2));
							break;
						case 2:
							$$->catalogname = $1;
							$$->schemaname = strVal(linitial($2));
							$$->relname = strVal(lsecond($2));
							break;
						default:
							ereport(ERROR,
									(errcode(ERRCODE_SYNTAX_ERROR),
									 errmsg("improper qualified name (too many dotted names): %s",
											NameListToString(lcons(makeString($1), $2)))));
							break;
					}
				}
		;

name_list:	name
					{ $$ = list_make1(makeString($1)); }
			| name_list ',' name
					{ $$ = lappend($1, makeString($3)); }
		;


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

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

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

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

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

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

/*
 * The production for a qualified func_name has to exactly match the
 * production for a qualified columnref, because we cannot tell which we
 * are parsing until we see what comes after it ('(' for a func_name,
 * anything else for a columnref).  Therefore we allow 'indirection' which
 * may contain subscripts, and reject that case in the C code.  (If we
 * ever implement SQL99-like methods, such syntax may actually become legal!)
 */
func_name:	function_name
					{ $$ = list_make1(makeString($1)); }
			| relation_name indirection
					{ $$ = check_func_name(lcons(makeString($1), $2)); }
		;


/*
 * Constants
 */
AexprConst: Iconst
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Integer;
					n->val.val.ival = $1;
					$$ = (Node *)n;
				}
			| FCONST
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Float;
					n->val.val.str = $1;
					$$ = (Node *)n;
				}
			| Sconst
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_String;
					n->val.val.str = $1;
					$$ = (Node *)n;
				}
			| BCONST
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_BitString;
					n->val.val.str = $1;
					$$ = (Node *)n;
				}
			| XCONST
				{
					/* This is a bit constant per SQL99:
					 * Without Feature F511, "BIT data type",
					 * a <general literal> shall not be a
					 * <bit string literal> or a <hex string literal>.
					 */
					A_Const *n = makeNode(A_Const);
					n->val.type = T_BitString;
					n->val.val.str = $1;
					$$ = (Node *)n;
				}
			| ConstTypename Sconst
				{
					A_Const *n = makeNode(A_Const);
					n->typename = $1;
					n->val.type = T_String;
					n->val.val.str = $2;
					$$ = (Node *)n;
				}
			| ConstInterval Sconst opt_interval
				{
					A_Const *n = makeNode(A_Const);
					n->typename = $1;
					n->val.type = T_String;
					n->val.val.str = $2;
					/* precision is not specified, but fields may be... */
					if ($3 != INTERVAL_FULL_RANGE)
						n->typename->typmod = INTERVAL_TYPMOD(INTERVAL_FULL_PRECISION, $3);
					$$ = (Node *)n;
				}
			| ConstInterval '(' Iconst ')' Sconst opt_interval
				{
					A_Const *n = makeNode(A_Const);
					n->typename = $1;
					n->val.type = T_String;
					n->val.val.str = $5;
					/* precision specified, and fields may be... */
					if ($3 < 0)
						ereport(ERROR,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision must not be negative",
										$3)));
					if ($3 > MAX_INTERVAL_PRECISION)
					{
						ereport(WARNING,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
								 errmsg("INTERVAL(%d) precision reduced to maximum allowed, %d",
										$3, MAX_INTERVAL_PRECISION)));
						$3 = MAX_INTERVAL_PRECISION;
					}
					n->typename->typmod = INTERVAL_TYPMOD($3, $6);
					$$ = (Node *)n;
				}
			| TRUE_P
				{
					$$ = (Node *)makeBoolAConst(TRUE);
				}
			| FALSE_P
				{
					$$ = (Node *)makeBoolAConst(FALSE);
				}
			| NULL_P
				{
					A_Const *n = makeNode(A_Const);
					n->val.type = T_Null;
					$$ = (Node *)n;
				}
		;

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

SignedIconst: ICONST								{ $$ = $1; }
			| '-' ICONST							{ $$ = - $2; }
		;

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

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

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

/* Function identifier --- names that can be function names.
 */
function_name:
			IDENT									{ $$ = $1; }
			| unreserved_keyword					{ $$ = pstrdup($1); }
			| func_name_keyword						{ $$ = pstrdup($1); }
		;

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


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

/* "Unreserved" keywords --- available for use as any kind of name.
 */
unreserved_keyword:
			  ABORT_P
			| ABSOLUTE_P
			| ACCESS
			| ACTION
			| ADD_P
			| ADMIN
			| AFTER
			| AGGREGATE
			| ALSO
			| ALTER
			| ASSERTION
			| ASSIGNMENT
			| AT
			| BACKWARD
			| BEFORE
			| BEGIN_P
			| BY
			| CACHE
			| CALLED
			| CASCADE
			| CASCADED
			| CHAIN
			| CHARACTERISTICS
			| CHECKPOINT
			| CLASS
			| CLOSE
			| CLUSTER
			| COMMENT
			| COMMIT
			| COMMITTED
			| CONCURRENTLY
			| CONNECTION
			| CONSTRAINTS
			| CONVERSION_P
			| COPY
			| CREATEDB
			| CREATEROLE
			| CREATEUSER
			| CSV
			| CURSOR
			| CYCLE
			| DATABASE
			| DAY_P
			| DEALLOCATE
			| DECLARE
			| DEFAULTS
			| DEFERRED
			| DEFINER
			| DELETE_P
			| DELIMITER
			| DELIMITERS
			| DISABLE_P
			| DOMAIN_P
			| DOUBLE_P
			| DROP
			| EACH
			| ENABLE_P
			| ENCODING
			| ENCRYPTED
			| ESCAPE
			| EXCLUDING
			| EXCLUSIVE
			| EXECUTE
			| EXPLAIN
			| EXTERNAL
			| FETCH
			| FIRST_P
			| FORCE
			| FORWARD
			| FUNCTION
			| GLOBAL
			| GRANTED
			| HANDLER
			| HEADER_P
			| HOLD
			| HOUR_P
			| IF_P
			| IMMEDIATE
			| IMMUTABLE
			| IMPLICIT_P
			| INCLUDING
			| INCREMENT
			| INDEX
			| INDEXES
			| INHERIT
			| INHERITS
			| INPUT_P
			| INSENSITIVE
			| INSERT
			| INSTEAD
			| INVOKER
			| ISOLATION
			| KEY
			| LANCOMPILER
			| LANGUAGE
			| LARGE_P
			| LAST_P
			| LEVEL
			| LISTEN
			| LOAD
			| LOCAL
			| LOCATION
			| LOCK_P
			| LOGIN_P
			| MATCH
			| MAXVALUE
			| MINUTE_P
			| MINVALUE
			| MODE
			| MONTH_P
			| MOVE
			| NAMES
			| NEXT
			| NO
			| NOCREATEDB
			| NOCREATEROLE
			| NOCREATEUSER
			| NOINHERIT
			| NOLOGIN_P
			| NOSUPERUSER
			| NOTHING
			| NOTIFY
			| NOWAIT
			| OBJECT_P
			| OF
			| OIDS
			| OPERATOR
			| OPTION
			| OWNED
			| OWNER
			| PARTIAL
			| PASSWORD
			| PREPARE
			| PREPARED
			| PRESERVE
			| PRIOR
			| PRIVILEGES
			| PROCEDURAL
			| PROCEDURE
			| QUOTE
			| READ
			| REASSIGN
			| RECHECK
			| REINDEX
			| RELATIVE_P
			| RELEASE
			| RENAME
			| REPEATABLE
			| REPLACE
			| REPLICATION
			| RESET
			| RESTART
			| RESTRICT
			| RETURNS
			| REVOKE
			| ROLE
			| ROLLBACK
			| ROWS
			| RULE
			| SAVEPOINT
			| SCHEMA
			| SCROLL
			| SECOND_P
			| SECURITY
			| SERVER
			| SEQUENCE
			| SERIALIZABLE
			| SESSION
			| SET
			| SHARE
			| SHOW
			| SIMPLE
			| STABLE
			| START
			| STATEMENT
			| STATISTICS
			| STDIN
			| STDOUT
			| STORAGE
			| SUPERUSER_P
			| SYSID
			| SYSTEM_P
			| STRICT_P
			| TABLESPACE
			| TEMP
			| TEMPLATE
			| TEMPORARY
			| TRANSACTION
			| TRIGGER
			| TRUNCATE
			| TRUSTED
			| TYPE_P
			| UNCOMMITTED
			| UNENCRYPTED
			| UNKNOWN
			| UNLISTEN
			| UNTIL
			| UPDATE
			| VACUUM
			| VALID
			| VALIDATOR
			| VARYING
			| VIEW
			| VOLATILE
			| WITH
			| WITHOUT
			| WORK
			| WRITE
			| YEAR_P
			| ZONE
		;

/* Column identifier --- keywords that can be column, table, etc names.
 *
 * Many of these keywords will in fact be recognized as type or function
 * names too; but they have special productions for the purpose, and so
 * can't be treated as "generic" type or function names.
 *
 * The type names appearing here are not usable as function names
 * because they can be followed by '(' in typename productions, which
 * looks too much like a function call for an LR(1) parser.
 */
col_name_keyword:
			  BIGINT
			| BIT
			| BOOLEAN_P
			| CHAR_P
			| CHARACTER
			| COALESCE
			| CONVERT
			| DEC
			| DECIMAL_P
			| EXISTS
			| EXTRACT
			| FLOAT_P
			| GREATEST
			| INOUT
			| INT_P
			| INTEGER
			| INTERVAL
			| LEAST
			| NATIONAL
			| NCHAR
			| NONE
			| NULLIF
			| NUMERIC
			| OUT_P
			| OVERLAY
			| POSITION
			| PRECISION
			| REAL
			| ROW
			| SETOF
			| SMALLINT
			| SUBSTRING
			| TIME
			| TIMESTAMP
			| TREAT
			| TRIM
			| VALUES
			| VARCHAR
		;

/* Function identifier --- keywords that can be function names.
 *
 * Most of these are keywords that are used as operators in expressions;
 * in general such keywords can't be column names because they would be
 * ambiguous with variables, but they are unambiguous as function identifiers.
 *
 * Do not include POSITION, SUBSTRING, etc here since they have explicit
 * productions in a_expr to support the goofy SQL9x argument syntax.
 * - thomas 2000-11-28
 */
func_name_keyword:
			  AUTHORIZATION
			| BETWEEN
			| BINARY
			| CROSS
			| FREEZE
			| FULL
			| ILIKE
			| INNER_P
			| IS
			| ISNULL
			| JOIN
			| LEFT
			| LIKE
			| NATURAL
			| NOTNULL
			| OUTER_P
			| OVERLAPS
			| RIGHT
			| SIMILAR
			| VERBOSE
		;

/* Reserved keyword --- these keywords are usable only as a ColLabel.
 *
 * Keywords appear here if they could not be distinguished from variable,
 * type, or function names in some contexts.  Don't put things here unless
 * forced to.
 */
reserved_keyword:
			  ALL
			| ANALYSE
			| ANALYZE
			| AND
			| ANY
			| ARRAY
			| AS
			| ASC
			| ASYMMETRIC
			| BOTH
			| CASE
			| CAST
			| CHECK
			| COLLATE
			| COLUMN
			| CONSTRAINT
			| CREATE
			| CURRENT_DATE
			| CURRENT_ROLE
			| CURRENT_TIME
			| CURRENT_TIMESTAMP
			| CURRENT_USER
			| DEFAULT
			| DEFERRABLE
			| DESC
			| DISTINCT
			| DO
			| ELSE
			| END_P
			| EXCEPT
			| FALSE_P
			| FOR
			| FOREIGN
			| FROM
			| GRANT
			| GROUP_P
			| HAVING
			| IN_P
			| INITIALLY
			| INTERSECT
			| INTO
			| LEADING
			| LIMIT
			| LOCALTIME
			| LOCALTIMESTAMP
			| NEW
			| NOT
			| NULL_P
			| OFF
			| OFFSET
			| OLD
			| ON
			| ONLY
			| OR
			| ORDER
			| PLACING
			| PRIMARY
			| REFERENCES
			| RETURNING
			| SELECT
			| SESSION_USER
			| SOME
			| SYMMETRIC
			| TABLE
			| THEN
			| TO
			| TRAILING
			| TRUE_P
			| UNION
			| UNIQUE
			| USER
			| USING
			| WHEN
			| WHERE
		;


SpecialRuleRelation:
			OLD
				{
					if (QueryIsRule)
						$$ = "*OLD*";
					else
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("OLD used in query that is not in a rule")));
				}
			| NEW
				{
					if (QueryIsRule)
						$$ = "*NEW*";
					else
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("NEW used in query that is not in a rule")));
				}
		;

%%

static Node *
makeColumnRef(char *relname, List *indirection, int location)
{
	/*
	 * Generate a ColumnRef node, with an A_Indirection node added if there
	 * is any subscripting in the specified indirection list.  However,
	 * any field selection at the start of the indirection list must be
	 * transposed into the "fields" part of the ColumnRef node.
	 */
	ColumnRef  *c = makeNode(ColumnRef);
	int		nfields = 0;
	ListCell *l;

	c->location = location;
	foreach(l, indirection)
	{
		if (IsA(lfirst(l), A_Indices))
		{
			A_Indirection *i = makeNode(A_Indirection);

			if (nfields == 0)
			{
				/* easy case - all indirection goes to A_Indirection */
				c->fields = list_make1(makeString(relname));
				i->indirection = indirection;
			}
			else
			{
				/* got to split the list in two */
				i->indirection = list_copy_tail(indirection, nfields);
				indirection = list_truncate(indirection, nfields);
				c->fields = lcons(makeString(relname), indirection);
			}
			i->arg = (Node *) c;
			return (Node *) i;
		}
		nfields++;
	}
	/* No subscripting, so all indirection gets added to field list */
	c->fields = lcons(makeString(relname), indirection);
	return (Node *) c;
}

static Node *
makeTypeCast(Node *arg, TypeName *typename)
{
	/*
	 * Simply generate a TypeCast node.
	 *
	 * Earlier we would determine whether an A_Const would
	 * be acceptable, however Domains require coerce_type()
	 * to process them -- applying constraints as required.
	 */
	TypeCast *n = makeNode(TypeCast);
	n->arg = arg;
	n->typename = typename;
	return (Node *) n;
}

static Node *
makeStringConst(char *str, TypeName *typename)
{
	A_Const *n = makeNode(A_Const);

	n->val.type = T_String;
	n->val.val.str = str;
	n->typename = typename;

	return (Node *)n;
}

static Node *
makeIntConst(int val)
{
	A_Const *n = makeNode(A_Const);
	n->val.type = T_Integer;
	n->val.val.ival = val;
	n->typename = SystemTypeName("int4");

	return (Node *)n;
}

static Node *
makeFloatConst(char *str)
{
	A_Const *n = makeNode(A_Const);

	n->val.type = T_Float;
	n->val.val.str = str;
	n->typename = SystemTypeName("float8");

	return (Node *)n;
}

static Node *
makeAConst(Value *v)
{
	Node *n;

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

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

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

	return n;
}

/* makeBoolAConst()
 * Create an A_Const node and initialize to a boolean constant.
 */
static A_Const *
makeBoolAConst(bool state)
{
	A_Const *n = makeNode(A_Const);
	n->val.type = T_String;
	n->val.val.str = (state? "t": "f");
	n->typename = SystemTypeName("bool");
	return n;
}

/* makeOverlaps()
 * Create and populate a FuncCall node to support the OVERLAPS operator.
 */
static FuncCall *
makeOverlaps(List *largs, List *rargs, int location)
{
	FuncCall *n = makeNode(FuncCall);

	n->funcname = SystemFuncName("overlaps");
	if (list_length(largs) == 1)
		largs = lappend(largs, largs);
	else if (list_length(largs) != 2)
		ereport(ERROR,
				(errcode(ERRCODE_SYNTAX_ERROR),
				 errmsg("wrong number of parameters on left side of OVERLAPS expression")));
	if (list_length(rargs) == 1)
		rargs = lappend(rargs, rargs);
	else if (list_length(rargs) != 2)
		ereport(ERROR,
				(errcode(ERRCODE_SYNTAX_ERROR),
				 errmsg("wrong number of parameters on right side of OVERLAPS expression")));
	n->args = list_concat(largs, rargs);
	n->agg_star = FALSE;
	n->agg_distinct = FALSE;
	n->location = location;
	return n;
}

/* check_qualified_name --- check the result of qualified_name production
 *
 * It's easiest to let the grammar production for qualified_name allow
 * subscripts and '*', which we then must reject here.
 */
static void
check_qualified_name(List *names)
{
	ListCell   *i;

	foreach(i, names)
	{
		if (!IsA(lfirst(i), String))
			yyerror("syntax error");
		else if (strcmp(strVal(lfirst(i)), "*") == 0)
			yyerror("syntax error");
	}
}

/* check_func_name --- check the result of func_name production
 *
 * It's easiest to let the grammar production for func_name allow subscripts
 * and '*', which we then must reject here.
 */
static List *
check_func_name(List *names)
{
	ListCell   *i;

	foreach(i, names)
	{
		if (!IsA(lfirst(i), String))
			yyerror("syntax error");
		else if (strcmp(strVal(lfirst(i)), "*") == 0)
			yyerror("syntax error");
	}
	return names;
}

/* extractArgTypes()
 * Given a list of FunctionParameter nodes, extract a list of just the
 * argument types (TypeNames) for input parameters only.  This is what
 * is needed to look up an existing function, which is what is wanted by
 * the productions that use this call.
 */
static List *
extractArgTypes(List *parameters)
{
	List	   *result = NIL;
	ListCell   *i;

	foreach(i, parameters)
	{
		FunctionParameter *p = (FunctionParameter *) lfirst(i);

		if (p->mode != FUNC_PARAM_OUT)			/* keep if IN or INOUT */
			result = lappend(result, p->argType);
	}
	return result;
}

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

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

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

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

/* SystemFuncName()
 * Build a properly-qualified reference to a built-in function.
 */
List *
SystemFuncName(char *name)
{
	return list_make2(makeString("pg_catalog"), makeString(name));
}

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

	n->names = list_make2(makeString("pg_catalog"), makeString(name));
	n->typmod = -1;
	n->location = -1;
	return n;
}

/* parser_init()
 * Initialize to parse one query string
 */
void
parser_init(void)
{
	QueryIsRule = FALSE;
}

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

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

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

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

	return (Node *) makeSimpleA_Expr(AEXPR_OP, "-", NULL, n, location);
}

static void
doNegateFloat(Value *v)
{
	char   *oldval = v->val.str;

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

		*newval = '-';
		strcpy(newval+1, oldval);
		v->val.str = newval;
	}
}

/*
 * Must undefine base_yylex before including scan.c, since we want it
 * to create the function base_yylex not filtered_base_yylex.
 */
#undef base_yylex

#include "scan.c"
