/src/backend/parser/gram.y

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%{

/*#define YYDEBUG 1*/
/*-------------------------------------------------------------------------
 *
 * gram.y
 *	  POSTGRESQL BISON rules/actions
 *
 * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  src/backend/parser/gram.y
 *
 * 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.
 *
 *	  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 during parse analysis 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 "catalog/pg_trigger.h"
#include "commands/defrem.h"
#include "commands/trigger.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "parser/gramparse.h"
#include "parser/parser.h"
#include "storage/lmgr.h"
#include "utils/date.h"
#include "utils/datetime.h"
#include "utils/numeric.h"
#include "utils/xml.h"


/*
 * Location tracking support --- simpler than bison's default, since we only
 * want to track the start position not the end position of each nonterminal.
 */
#define YYLLOC_DEFAULT(Current, Rhs, N) \
	do { \
		if ((N) > 0) \
			(Current) = (Rhs)[1]; \
		else \
			(Current) = (-1); \
	} while (0)

/*
 * The above macro assigns -1 (unknown) as the parse location of any
 * nonterminal that was reduced from an empty rule.  This is problematic
 * for nonterminals defined like
 *		OptFooList: / * EMPTY * / { ... } | OptFooList Foo { ... } ;
 * because we'll set -1 as the location during the first reduction and then
 * copy it during each subsequent reduction, leaving us with -1 for the
 * location even when the list is not empty.  To fix that, do this in the
 * action for the nonempty rule(s):
 *		if (@$ < 0) @$ = @2;
 * (Although we have many nonterminals that follow this pattern, we only
 * bother with fixing @$ like this when the nonterminal's parse location
 * is actually referenced in some rule.)
 */

/*
 * Bison doesn't allocate anything that needs to live across parser calls,
 * so we can easily have it use palloc instead of malloc.  This prevents
 * memory leaks if we error out during parsing.  Note this only works with
 * bison >= 2.0.  However, in bison 1.875 the default is to use alloca()
 * if possible, so there's not really much problem anyhow, at least if
 * you're building with gcc.
 */
#define YYMALLOC palloc
#define YYFREE   pfree

/* Private struct for the result of privilege_target production */
typedef struct PrivTarget
{
	GrantTargetType targtype;
	GrantObjectType objtype;
	List	   *objs;
} PrivTarget;

/* ConstraintAttributeSpec yields an integer bitmask of these flags: */
#define CAS_NOT_DEFERRABLE			0x01
#define CAS_DEFERRABLE				0x02
#define CAS_INITIALLY_IMMEDIATE		0x04
#define CAS_INITIALLY_DEFERRED		0x08
#define CAS_NOT_VALID				0x10
#define CAS_NO_INHERIT				0x20


#define parser_yyerror(msg)  scanner_yyerror(msg, yyscanner)
#define parser_errposition(pos)  scanner_errposition(pos, yyscanner)

static void base_yyerror(YYLTYPE *yylloc, core_yyscan_t yyscanner,
						 const char *msg);
static Node *makeColumnRef(char *colname, List *indirection,
						   int location, core_yyscan_t yyscanner);
static Node *makeTypeCast(Node *arg, TypeName *typename, int location);
static Node *makeStringConst(char *str, int location);
static Node *makeStringConstCast(char *str, int location, TypeName *typename);
static Node *makeIntConst(int val, int location);
static Node *makeFloatConst(char *str, int location);
static Node *makeBitStringConst(char *str, int location);
static Node *makeNullAConst(int location);
static Node *makeAConst(Value *v, int location);
static Node *makeBoolAConst(bool state, int location);
static void check_qualified_name(List *names, core_yyscan_t yyscanner);
static List *check_func_name(List *names, core_yyscan_t yyscanner);
static List *check_indirection(List *indirection, core_yyscan_t yyscanner);
static List *extractArgTypes(List *parameters);
static List *extractAggrArgTypes(List *aggrargs);
static List *makeOrderedSetArgs(List *directargs, List *orderedargs,
								core_yyscan_t yyscanner);
static void insertSelectOptions(SelectStmt *stmt,
								List *sortClause, List *lockingClause,
								Node *limitOffset, Node *limitCount,
								WithClause *withClause,
								core_yyscan_t yyscanner);
static Node *makeSetOp(SetOperation op, bool all, Node *larg, Node *rarg);
static Node *doNegate(Node *n, int location);
static void doNegateFloat(Value *v);
static Node *makeAArrayExpr(List *elements, int location);
static Node *makeXmlExpr(XmlExprOp op, char *name, List *named_args,
						 List *args, int location);
static List *mergeTableFuncParameters(List *func_args, List *columns);
static TypeName *TableFuncTypeName(List *columns);
static RangeVar *makeRangeVarFromAnyName(List *names, int position, core_yyscan_t yyscanner);
static void SplitColQualList(List *qualList,
							 List **constraintList, CollateClause **collClause,
							 core_yyscan_t yyscanner);
static void processCASbits(int cas_bits, int location, const char *constrType,
			   bool *deferrable, bool *initdeferred, bool *not_valid,
			   bool *no_inherit, core_yyscan_t yyscanner);
static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);

%}

%pure-parser
%expect 0
%name-prefix="base_yy"
%locations

%parse-param {core_yyscan_t yyscanner}
%lex-param   {core_yyscan_t yyscanner}

%union
{
	core_YYSTYPE		core_yystype;
	/* these fields must match core_YYSTYPE: */
	int					ival;
	char				*str;
	const char			*keyword;

	char				chr;
	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;
	WindowDef			*windef;
	JoinExpr			*jexpr;
	IndexElem			*ielem;
	Alias				*alias;
	RangeVar			*range;
	IntoClause			*into;
	WithClause			*with;
	A_Indices			*aind;
	ResTarget			*target;
	struct PrivTarget	*privtarget;
	AccessPriv			*accesspriv;
	InsertStmt			*istmt;
	VariableSetStmt		*vsetstmt;
}

%type <node>	stmt schema_stmt
		AlterEventTrigStmt
		AlterDatabaseStmt AlterDatabaseSetStmt AlterDomainStmt AlterEnumStmt
		AlterFdwStmt AlterForeignServerStmt AlterGroupStmt
		AlterObjectSchemaStmt AlterOwnerStmt AlterSeqStmt AlterSystemStmt AlterTableStmt
		AlterExtensionStmt AlterExtensionContentsStmt AlterForeignTableStmt
		AlterCompositeTypeStmt AlterUserStmt AlterUserMappingStmt AlterUserSetStmt
		AlterRoleStmt AlterRoleSetStmt
		AlterDefaultPrivilegesStmt DefACLAction
		AnalyzeStmt ClosePortalStmt ClusterStmt CommentStmt
		ConstraintsSetStmt CopyStmt CreateAsStmt CreateCastStmt
		CreateDomainStmt CreateExtensionStmt CreateGroupStmt CreateOpClassStmt
		CreateOpFamilyStmt AlterOpFamilyStmt CreatePLangStmt
		CreateSchemaStmt CreateSeqStmt CreateStmt CreateTableSpaceStmt
		CreateFdwStmt CreateForeignServerStmt CreateForeignTableStmt
		CreateAssertStmt CreateTrigStmt CreateEventTrigStmt
		CreateUserStmt CreateUserMappingStmt CreateRoleStmt
		CreatedbStmt DeclareCursorStmt DefineStmt DeleteStmt DiscardStmt DoStmt
		DropGroupStmt DropOpClassStmt DropOpFamilyStmt DropPLangStmt DropStmt
		DropAssertStmt DropTrigStmt DropRuleStmt DropCastStmt DropRoleStmt
		DropUserStmt DropdbStmt DropTableSpaceStmt DropFdwStmt
		DropForeignServerStmt DropUserMappingStmt ExplainStmt FetchStmt
		GrantStmt GrantRoleStmt IndexStmt InsertStmt ListenStmt LoadStmt
		LockStmt NotifyStmt ExplainableStmt PreparableStmt
		CreateFunctionStmt AlterFunctionStmt ReindexStmt RemoveAggrStmt
		RemoveFuncStmt RemoveOperStmt RenameStmt RevokeStmt RevokeRoleStmt
		RuleActionStmt RuleActionStmtOrEmpty RuleStmt
		SecLabelStmt SelectStmt TransactionStmt TruncateStmt
		UnlistenStmt UpdateStmt VacuumStmt
		VariableResetStmt VariableSetStmt VariableShowStmt
		ViewStmt CheckPointStmt CreateConversionStmt
		DeallocateStmt PrepareStmt ExecuteStmt
		DropOwnedStmt ReassignOwnedStmt
		AlterTSConfigurationStmt AlterTSDictionaryStmt
		CreateMatViewStmt RefreshMatViewStmt

%type <node>	select_no_parens select_with_parens select_clause
				simple_select values_clause

%type <node>	alter_column_default opclass_item opclass_drop alter_using
%type <ival>	add_drop opt_asc_desc opt_nulls_order

%type <node>	alter_table_cmd alter_type_cmd opt_collate_clause
	   replica_identity
%type <list>	alter_table_cmds alter_type_cmds

%type <dbehavior>	opt_drop_behavior

%type <list>	createdb_opt_list alterdb_opt_list copy_opt_list
				transaction_mode_list
				create_extension_opt_list alter_extension_opt_list
%type <defelt>	createdb_opt_item alterdb_opt_item copy_opt_item
				transaction_mode_item
				create_extension_opt_item alter_extension_opt_item

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

%type <list>	OptRoleList AlterOptRoleList
%type <defelt>	CreateOptRoleElem AlterOptRoleElem

%type <str>		opt_type
%type <str>		foreign_server_version opt_foreign_server_version
%type <str>		auth_ident
%type <str>		opt_in_database

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

%type <boolean> TriggerForSpec TriggerForType
%type <ival>	TriggerActionTime
%type <list>	TriggerEvents TriggerOneEvent
%type <value>	TriggerFuncArg
%type <node>	TriggerWhen

%type <list>	event_trigger_when_list event_trigger_value_list
%type <defelt>	event_trigger_when_item
%type <chr>		enable_trigger

%type <str>		copy_file_name
				database_name access_method_clause access_method attr_name
				name cursor_name file_name
				index_name opt_index_name cluster_index_specification

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

%type <range>	qualified_name OptConstrFromTable

%type <str>		all_Op MathOp

%type <str>		iso_level opt_encoding
%type <node>	grantee
%type <list>	grantee_list
%type <accesspriv> privilege
%type <list>	privileges privilege_list
%type <privtarget> privilege_target
%type <funwithargs> function_with_argtypes
%type <list>	function_with_argtypes_list
%type <ival>	defacl_privilege_target
%type <defelt>	DefACLOption
%type <list>	DefACLOptionList

%type <list>	stmtblock stmtmulti
				OptTableElementList TableElementList OptInherit definition
				OptTypedTableElementList TypedTableElementList
				reloptions opt_reloptions
				OptWith opt_distinct opt_definition func_args func_args_list
				func_args_with_defaults func_args_with_defaults_list
				aggr_args aggr_args_list
				func_as createfunc_opt_list alterfunc_opt_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 role_list from_clause from_list opt_array_bounds
				qualified_name_list any_name any_name_list
				any_operator expr_list attrs
				target_list opt_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
				reloption_list group_clause TriggerFuncArgs select_limit
				opt_select_limit opclass_item_list opclass_drop_list
				opclass_purpose opt_opfamily transaction_mode_list_or_empty
				OptTableFuncElementList TableFuncElementList opt_type_modifiers
				prep_type_clause
				execute_param_clause using_clause returning_clause
				opt_enum_val_list enum_val_list table_func_column_list
				create_generic_options alter_generic_options
				relation_expr_list dostmt_opt_list

%type <list>	opt_fdw_options fdw_options
%type <defelt>	fdw_option

%type <range>	OptTempTableName
%type <into>	into_clause create_as_target create_mv_target

%type <defelt>	createfunc_opt_item common_func_opt_item dostmt_opt_item
%type <fun_param> func_arg func_arg_with_default table_func_column aggr_arg
%type <fun_param_mode> arg_class
%type <typnam>	func_return func_type

%type <boolean>  opt_trusted opt_restart_seqs
%type <ival>	 OptTemp
%type <ival>	 OptNoLog
%type <oncommit> OnCommitOption

%type <ival>	for_locking_strength
%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 <list>	opt_interval interval_second
%type <node>	overlay_placing substr_from substr_for

%type <boolean> opt_instead
%type <boolean> opt_unique opt_concurrently 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_program

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

%type <node>	fetch_args limit_clause select_limit_value
				offset_clause select_offset_value
				select_offset_value2 opt_select_fetch_first_value
%type <ival>	row_or_rows first_or_next

%type <list>	OptSeqOptList SeqOptList
%type <defelt>	SeqOptElem

%type <istmt>	insert_rest

%type <vsetstmt> generic_set set_rest set_rest_more SetResetClause FunctionSetResetClause

%type <node>	TableElement TypedTableElement ConstraintElem TableFuncElement
%type <node>	columnDef columnOptions
%type <defelt>	def_elem reloption_elem old_aggr_elem
%type <node>	def_arg columnElem where_clause where_or_current_clause
				a_expr b_expr c_expr AexprConst indirection_el
				columnref in_expr having_clause func_table array_expr
				ExclusionWhereClause
%type <list>	rowsfrom_item rowsfrom_list opt_col_def_list
%type <boolean> opt_ordinality
%type <list>	ExclusionConstraintList ExclusionConstraintElem
%type <list>	func_arg_list
%type <node>	func_arg_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 <node>	ctext_expr
%type <value>	NumericOnly
%type <list>	NumericOnly_list
%type <alias>	alias_clause opt_alias_clause
%type <list>	func_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 <str>		generic_option_name
%type <node>	generic_option_arg
%type <defelt>	generic_option_elem alter_generic_option_elem
%type <list>	generic_option_list alter_generic_option_list
%type <str>		explain_option_name
%type <node>	explain_option_arg
%type <defelt>	explain_option_elem
%type <list>	explain_option_list
%type <node>	copy_generic_opt_arg copy_generic_opt_arg_list_item
%type <defelt>	copy_generic_opt_elem
%type <list>	copy_generic_opt_list copy_generic_opt_arg_list
%type <list>	copy_options

%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 <boolean> opt_varying opt_timezone opt_no_inherit

%type <ival>	Iconst SignedIconst
%type <str>		Sconst comment_text notify_payload
%type <str>		RoleId opt_granted_by opt_boolean_or_string
%type <list>	var_list
%type <str>		ColId ColLabel var_name type_function_name param_name
%type <str>		NonReservedWord NonReservedWord_or_Sconst
%type <node>	var_value zone_value

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

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

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

%type <str>		opt_provider security_label

%type <target>	xml_attribute_el
%type <list>	xml_attribute_list xml_attributes
%type <node>	xml_root_version opt_xml_root_standalone
%type <node>	xmlexists_argument
%type <ival>	document_or_content
%type <boolean> xml_whitespace_option

%type <node>	func_application func_expr_common_subexpr
%type <node>	func_expr func_expr_windowless
%type <node>	common_table_expr
%type <with>	with_clause opt_with_clause
%type <list>	cte_list

%type <list>	within_group_clause
%type <node>	filter_clause
%type <list>	window_clause window_definition_list opt_partition_clause
%type <windef>	window_definition over_clause window_specification
				opt_frame_clause frame_extent frame_bound
%type <str>		opt_existing_window_name
%type <boolean> opt_if_not_exists

/*
 * Non-keyword token types.  These are hard-wired into the "flex" lexer.
 * They must be listed first so that their numeric codes do not depend on
 * the set of keywords.  PL/pgsql depends on this so that it can share the
 * same lexer.  If you add/change tokens here, fix PL/pgsql to match!
 *
 * DOT_DOT is unused in the core SQL grammar, and so will always provoke
 * parse errors.  It is needed by PL/pgsql.
 */
%token <str>	IDENT FCONST SCONST BCONST XCONST Op
%token <ival>	ICONST PARAM
%token			TYPECAST DOT_DOT COLON_EQUALS

/*
 * If you want to make any keyword changes, update the keyword table in
 * src/include/parser/kwlist.h and add new keywords to the appropriate one
 * of the reserved-or-not-so-reserved keyword lists, below; search
 * this file for "Keyword category lists".
 */

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

	BACKWARD BEFORE BEGIN_P BETWEEN BIGINT BINARY BIT
	BOOLEAN_P BOTH BY

	CACHE CALLED CASCADE CASCADED CASE CAST CATALOG_P CHAIN CHAR_P
	CHARACTER CHARACTERISTICS CHECK CHECKPOINT CLASS CLOSE
	CLUSTER COALESCE COLLATE COLLATION COLUMN COMMENT COMMENTS COMMIT
	COMMITTED CONCURRENTLY CONFIGURATION CONNECTION CONSTRAINT CONSTRAINTS
	CONTENT_P CONTINUE_P CONVERSION_P COPY COST CREATE
	CROSS CSV CURRENT_P
	CURRENT_CATALOG CURRENT_DATE CURRENT_ROLE CURRENT_SCHEMA
	CURRENT_TIME CURRENT_TIMESTAMP CURRENT_USER CURSOR CYCLE

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

	EACH ELSE ENABLE_P ENCODING ENCRYPTED END_P ENUM_P ESCAPE EVENT EXCEPT
	EXCLUDE EXCLUDING EXCLUSIVE EXECUTE EXISTS EXPLAIN
	EXTENSION EXTERNAL EXTRACT

	FALSE_P FAMILY FETCH FILTER FIRST_P FLOAT_P FOLLOWING FOR
	FORCE FOREIGN FORWARD FREEZE FROM FULL FUNCTION FUNCTIONS

	GLOBAL GRANT GRANTED GREATEST GROUP_P

	HANDLER HAVING HEADER_P HOLD HOUR_P

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

	JOIN

	KEY

	LABEL LANGUAGE LARGE_P LAST_P LATERAL_P LC_COLLATE_P LC_CTYPE_P
	LEADING LEAKPROOF LEAST LEFT LEVEL LIKE LIMIT LISTEN LOAD LOCAL
	LOCALTIME LOCALTIMESTAMP LOCATION LOCK_P

	MAPPING MATCH MATERIALIZED MAXVALUE MINUTE_P MINVALUE MODE MONTH_P MOVE

	NAME_P NAMES NATIONAL NATURAL NCHAR NEXT NO NONE
	NOT NOTHING NOTIFY NOTNULL NOWAIT NULL_P NULLIF
	NULLS_P NUMERIC

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

	PARSER PARTIAL PARTITION PASSING PASSWORD PLACING PLANS POSITION
	PRECEDING PRECISION PRESERVE PREPARE PREPARED PRIMARY
	PRIOR PRIVILEGES PROCEDURAL PROCEDURE PROGRAM

	QUOTE

	RANGE READ REAL REASSIGN RECHECK RECURSIVE REF REFERENCES REFRESH REINDEX
	RELATIVE_P RELEASE RENAME REPEATABLE REPLACE REPLICA
	RESET RESTART RESTRICT RETURNING RETURNS REVOKE RIGHT ROLE ROLLBACK
	ROW ROWS RULE

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

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

	UNBOUNDED UNCOMMITTED UNENCRYPTED UNION UNIQUE UNKNOWN UNLISTEN UNLOGGED
	UNTIL UPDATE USER USING

	VACUUM VALID VALIDATE VALIDATOR VALUE_P VALUES VARCHAR VARIADIC VARYING
	VERBOSE VERSION_P VIEW VIEWS VOLATILE

	WHEN WHERE WHITESPACE_P WINDOW WITH WITHIN WITHOUT WORK WRAPPER WRITE

	XML_P XMLATTRIBUTES XMLCONCAT XMLELEMENT XMLEXISTS XMLFOREST XMLPARSE
	XMLPI XMLROOT XMLSERIALIZE

	YEAR_P YES_P

	ZONE

/*
 * The grammar thinks these are keywords, but they are not in the kwlist.h
 * list and so can never be entered directly.  The filter in parser.c
 * creates these tokens when required.
 */
%token			NULLS_FIRST NULLS_LAST WITH_ORDINALITY WITH_TIME


/* 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 */
/*
 * To support target_el without AS, we must give IDENT an explicit priority
 * between POSTFIXOP and Op.  We can safely assign the same priority to
 * various unreserved keywords as needed to resolve ambiguities (this can't
 * have any bad effects since obviously the keywords will still behave the
 * same as if they weren't keywords).  We need to do this for PARTITION,
 * RANGE, ROWS to support opt_existing_window_name; and for RANGE, ROWS
 * so that they can follow a_expr without creating postfix-operator problems;
 * and for NULL so that it can follow b_expr in ColQualList without creating
 * postfix-operator problems.
 *
 * The frame_bound productions UNBOUNDED PRECEDING and UNBOUNDED FOLLOWING
 * are even messier: since UNBOUNDED is an unreserved keyword (per spec!),
 * there is no principled way to distinguish these from the productions
 * a_expr PRECEDING/FOLLOWING.  We hack this up by giving UNBOUNDED slightly
 * lower precedence than PRECEDING and FOLLOWING.  At present this doesn't
 * appear to cause UNBOUNDED to be treated differently from other unreserved
 * keywords anywhere else in the grammar, but it's definitely risky.  We can
 * blame any funny behavior of UNBOUNDED on the SQL standard, though.
 */
%nonassoc	UNBOUNDED		/* ideally should have same precedence as IDENT */
%nonassoc	IDENT NULL_P PARTITION RANGE ROWS PRECEDING FOLLOWING
%left		Op OPERATOR		/* multi-character ops and user-defined operators */
%nonassoc	NOTNULL
%nonassoc	ISNULL
%nonassoc	IS				/* sets precedence for IS NULL, etc */
%left		'+' '-'
%left		'*' '/' '%'
%left		'^'
/* Unary Operators */
%left		AT				/* sets precedence for AT TIME ZONE */
%left		COLLATE
%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
/* kluge to keep xml_whitespace_option from causing shift/reduce conflicts */
%right		PRESERVE STRIP_P

%%

/*
 *	The target production for the whole parse.
 */
stmtblock:	stmtmulti
			{
				pg_yyget_extra(yyscanner)->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 :
			AlterEventTrigStmt
			| AlterDatabaseStmt
			| AlterDatabaseSetStmt
			| AlterDefaultPrivilegesStmt
			| AlterDomainStmt
			| AlterEnumStmt
			| AlterExtensionStmt
			| AlterExtensionContentsStmt
			| AlterFdwStmt
			| AlterForeignServerStmt
			| AlterForeignTableStmt
			| AlterFunctionStmt
			| AlterGroupStmt
			| AlterObjectSchemaStmt
			| AlterOwnerStmt
			| AlterSeqStmt
			| AlterSystemStmt
			| AlterTableStmt
			| AlterCompositeTypeStmt
			| AlterRoleSetStmt
			| AlterRoleStmt
			| AlterTSConfigurationStmt
			| AlterTSDictionaryStmt
			| AlterUserMappingStmt
			| AlterUserSetStmt
			| AlterUserStmt
			| AnalyzeStmt
			| CheckPointStmt
			| ClosePortalStmt
			| ClusterStmt
			| CommentStmt
			| ConstraintsSetStmt
			| CopyStmt
			| CreateAsStmt
			| CreateAssertStmt
			| CreateCastStmt
			| CreateConversionStmt
			| CreateDomainStmt
			| CreateExtensionStmt
			| CreateFdwStmt
			| CreateForeignServerStmt
			| CreateForeignTableStmt
			| CreateFunctionStmt
			| CreateGroupStmt
			| CreateMatViewStmt
			| CreateOpClassStmt
			| CreateOpFamilyStmt
			| AlterOpFamilyStmt
			| CreatePLangStmt
			| CreateSchemaStmt
			| CreateSeqStmt
			| CreateStmt
			| CreateTableSpaceStmt
			| CreateTrigStmt
			| CreateEventTrigStmt
			| CreateRoleStmt
			| CreateUserStmt
			| CreateUserMappingStmt
			| CreatedbStmt
			| DeallocateStmt
			| DeclareCursorStmt
			| DefineStmt
			| DeleteStmt
			| DiscardStmt
			| DoStmt
			| DropAssertStmt
			| DropCastStmt
			| DropFdwStmt
			| DropForeignServerStmt
			| DropGroupStmt
			| DropOpClassStmt
			| DropOpFamilyStmt
			| DropOwnedStmt
			| DropPLangStmt
			| DropRuleStmt
			| DropStmt
			| DropTableSpaceStmt
			| DropTrigStmt
			| DropRoleStmt
			| DropUserStmt
			| DropUserMappingStmt
			| DropdbStmt
			| ExecuteStmt
			| ExplainStmt
			| FetchStmt
			| GrantStmt
			| GrantRoleStmt
			| IndexStmt
			| InsertStmt
			| ListenStmt
			| RefreshMatViewStmt
			| LoadStmt
			| LockStmt
			| NotifyStmt
			| PrepareStmt
			| ReassignOwnedStmt
			| ReindexStmt
			| RemoveAggrStmt
			| RemoveFuncStmt
			| RemoveOperStmt
			| RenameStmt
			| RevokeStmt
			| RevokeRoleStmt
			| RuleStmt
			| SecLabelStmt
			| 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 CreateOptRoleElem			{ $$ = lappend($1, $2); }
			| /* EMPTY */							{ $$ = NIL; }
		;

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

AlterOptRoleElem:
			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));
				}
			| INHERIT
				{
					$$ = makeDefElem("inherit", (Node *)makeInteger(TRUE));
				}
			| CONNECTION LIMIT SignedIconst
				{
					$$ = makeDefElem("connectionlimit", (Node *)makeInteger($3));
				}
			| VALID UNTIL Sconst
				{
					$$ = makeDefElem("validUntil", (Node *)makeString($3));
				}
		/*	Supported but not documented for roles, for use by ALTER GROUP. */
			| USER role_list
				{
					$$ = makeDefElem("rolemembers", (Node *)$2);
				}
			| IDENT
				{
					/*
					 * We handle identifiers that aren't parser keywords with
					 * the following special-case codes, to avoid bloating the
					 * size of the main parser.
					 */
					if (strcmp($1, "superuser") == 0)
						$$ = makeDefElem("superuser", (Node *)makeInteger(TRUE));
					else if (strcmp($1, "nosuperuser") == 0)
						$$ = makeDefElem("superuser", (Node *)makeInteger(FALSE));
					else if (strcmp($1, "createuser") == 0)
					{
						/* For backwards compatibility, synonym for SUPERUSER */
						$$ = makeDefElem("superuser", (Node *)makeInteger(TRUE));
					}
					else if (strcmp($1, "nocreateuser") == 0)
					{
						/* For backwards compatibility, synonym for SUPERUSER */
						$$ = makeDefElem("superuser", (Node *)makeInteger(FALSE));
					}
					else if (strcmp($1, "createrole") == 0)
						$$ = makeDefElem("createrole", (Node *)makeInteger(TRUE));
					else if (strcmp($1, "nocreaterole") == 0)
						$$ = makeDefElem("createrole", (Node *)makeInteger(FALSE));
					else if (strcmp($1, "replication") == 0)
						$$ = makeDefElem("isreplication", (Node *)makeInteger(TRUE));
					else if (strcmp($1, "noreplication") == 0)
						$$ = makeDefElem("isreplication", (Node *)makeInteger(FALSE));
					else if (strcmp($1, "createdb") == 0)
						$$ = makeDefElem("createdb", (Node *)makeInteger(TRUE));
					else if (strcmp($1, "nocreatedb") == 0)
						$$ = makeDefElem("createdb", (Node *)makeInteger(FALSE));
					else if (strcmp($1, "login") == 0)
						$$ = makeDefElem("canlogin", (Node *)makeInteger(TRUE));
					else if (strcmp($1, "nologin") == 0)
						$$ = makeDefElem("canlogin", (Node *)makeInteger(FALSE));
					else if (strcmp($1, "noinherit") == 0)
					{
						/*
						 * Note that INHERIT is a keyword, so it's handled by main parser, but
						 * NOINHERIT is handled here.
						 */
						$$ = makeDefElem("inherit", (Node *)makeInteger(FALSE));
					}
					else
						ereport(ERROR,
								(errcode(ERRCODE_SYNTAX_ERROR),
								 errmsg("unrecognized role option \"%s\"", $1),
									 parser_errposition(@1)));
				}
		;

CreateOptRoleElem:
			AlterOptRoleElem			{ $$ = $1; }
			/* The following are not supported by ALTER ROLE/USER/GROUP */
			| SYSID Iconst
				{
					$$ = makeDefElem("sysid", (Node *)makeInteger($2));
				}
			| ADMIN role_list
				{
					$$ = makeDefElem("adminmembers", (Node *)$2);
				}
			| ROLE role_list
				{
					$$ = makeDefElem("rolemembers", (Node *)$2);
				}
			| IN_P ROLE role_list
				{
					$$ = makeDefElem("addroleto", (Node *)$3);
				}
			| IN_P GROUP_P role_list
				{
					$$ = 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 AlterOptRoleList
				 {
					AlterRoleStmt *n = makeNode(AlterRoleStmt);
					n->role = $3;
					n->action = +1;	/* add, if there are members */
					n->options = $5;
					$$ = (Node *)n;
				 }
		;

opt_in_database:
			   /* EMPTY */					{ $$ = NULL; }
			| IN_P DATABASE database_name	{ $$ = $3; }
		;

AlterRoleSetStmt:
			ALTER ROLE RoleId opt_in_database SetResetClause
				{
					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
					n->role = $3;
					n->database = $4;
					n->setstmt = $5;
					$$ = (Node *)n;
				}
			| ALTER ROLE ALL opt_in_database SetResetClause
				{
					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
					n->role = NULL;
					n->database = $4;
					n->setstmt = $5;
					$$ = (Node *)n;
				}
		;


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

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


AlterUserSetStmt:
			ALTER USER RoleId SetResetClause
				{
					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
					n->role = $3;
					n->database = NULL;
					n->setstmt = $4;
					$$ = (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 role_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = FALSE;
					n->roles = $3;
					$$ = (Node *)n;
				}
			| DROP ROLE IF_P EXISTS role_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = TRUE;
					n->roles = $5;
					$$ = (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 role_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = FALSE;
					n->roles = $3;
					$$ = (Node *)n;
				}
			| DROP USER IF_P EXISTS role_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->roles = $5;
					n->missing_ok = TRUE;
					$$ = (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 role_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 role_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = FALSE;
					n->roles = $3;
					$$ = (Node *)n;
				}
			| DROP GROUP_P IF_P EXISTS role_list
				{
					DropRoleStmt *n = makeNode(DropRoleStmt);
					n->missing_ok = TRUE;
					n->roles = $5;
					$$ = (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;
					n->if_not_exists = false;
					$$ = (Node *)n;
				}
			| CREATE SCHEMA ColId OptSchemaEltList
				{
					CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
					/* ...but not both */
					n->schemaname = $3;
					n->authid = NULL;
					n->schemaElts = $4;
					n->if_not_exists = false;
					$$ = (Node *)n;
				}
			| CREATE SCHEMA IF_P NOT EXISTS OptSchemaName AUTHORIZATION RoleId OptSchemaEltList
				{
					CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
					/* One can omit the schema name or the authorization id. */
					if ($6 != NULL)
						n->schemaname = $6;
					else
						n->schemaname = $8;
					n->authid = $8;
					if ($9 != NIL)
						ereport(ERROR,
								(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
								 errmsg("CREATE SCHEMA IF NOT EXISTS cannot include schema elements"),
								 parser_errposition(@9)));
					n->schemaElts = $9;
					n->if_not_exists = true;
					$$ = (Node *)n;
				}
			| CREATE SCHEMA IF_P NOT EXISTS ColId OptSchemaEltList
				{
					CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
					/* ...but not both */
					n->schemaname = $6;
					n->authid = NULL;
					if ($7 != NIL)
						ereport(ERROR,
								(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
								 errmsg("CREATE SCHEMA IF NOT EXISTS cannot include schema elements"),
								 parser_errposition(@7)));
					n->schemaElts = $7;
					n->if_not_exists = true;
					$$ = (Node *)n;
				}
		;

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

OptSchemaEltList:
			OptSchemaEltList schema_stmt
				{
					if (@$ < 0)			/* see comments for YYLLOC_DEFAULT */
						@$ = @2;
					$$ = lappend($1, $2);
				}
			| /* EMPTY */
				{ $$ = 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 SQL 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:
			TRANSACTION transaction_mode_list
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_MULTI;
					n->name = "TRANSACTION";
					n->args = $2;
					$$ = n;
				}
			| SESSION CHARACTERISTICS AS TRANSACTION transaction_mode_list
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_MULTI;
					n->name = "SESSION CHARACTERISTICS";
					n->args = $5;
					$$ = n;
				}
			| set_rest_more
			;

generic_set:
			var_name TO var_list
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_VALUE;
					n->name = $1;
					n->args = $3;
					$$ = n;
				}
			| var_name '=' var_list
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_VALUE;
					n->name = $1;
					n->args = $3;
					$$ = n;
				}
			| var_name TO DEFAULT
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_DEFAULT;
					n->name = $1;
					$$ = n;
				}
			| var_name '=' DEFAULT
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_DEFAULT;
					n->name = $1;
					$$ = n;
				}

set_rest_more:	/* Generic SET syntaxes: */
			generic_set 						{$$ = $1;}
			| var_name FROM CURRENT_P
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_CURRENT;
					n->name = $1;
					$$ = n;
				}
			/* Special syntaxes mandated by SQL standard: */
			| TIME ZONE zone_value
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_VALUE;
					n->name = "timezone";
					if ($3 != NULL)
						n->args = list_make1($3);
					else
						n->kind = VAR_SET_DEFAULT;
					$$ = n;
				}
			| CATALOG_P Sconst
				{
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("current database cannot be changed"),
							 parser_errposition(@2)));
					$$ = NULL; /*not reached*/
				}
			| SCHEMA Sconst
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_VALUE;
					n->name = "search_path";
					n->args = list_make1(makeStringConst($2, @2));
					$$ = n;
				}
			| NAMES opt_encoding
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_VALUE;
					n->name = "client_encoding";
					if ($2 != NULL)
						n->args = list_make1(makeStringConst($2, @2));
					else
						n->kind = VAR_SET_DEFAULT;
					$$ = n;
				}
			| ROLE NonReservedWord_or_Sconst
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_VALUE;
					n->name = "role";
					n->args = list_make1(makeStringConst($2, @2));
					$$ = n;
				}
			| SESSION AUTHORIZATION NonReservedWord_or_Sconst
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_VALUE;
					n->name = "session_authorization";
					n->args = list_make1(makeStringConst($3, @3));
					$$ = n;
				}
			| SESSION AUTHORIZATION DEFAULT
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_DEFAULT;
					n->name = "session_authorization";
					$$ = n;
				}
			| XML_P OPTION document_or_content
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_VALUE;
					n->name = "xmloption";
					n->args = list_make1(makeStringConst($3 == XMLOPTION_DOCUMENT ? "DOCUMENT" : "CONTENT", @3));
					$$ = n;
				}
			/* Special syntaxes invented by PostgreSQL: */
			| TRANSACTION SNAPSHOT Sconst
				{
					VariableSetStmt *n = makeNode(VariableSetStmt);
					n->kind = VAR_SET_MULTI;
					n->name = "TRANSACTION SNAPSHOT";
					n->args = list_make1(makeStringConst($3, @3));
					$$ = n;
				}
		;

var_name:	ColId								{ $$ = $1; }
			| var_name '.' ColId
				{ $$ = psprintf("%s.%s", $1, $3); }
		;

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

var_value:	opt_boolean_or_string
				{ $$ = makeStringConst($1, @1); }
			| NumericOnly
				{ $$ = makeAConst($1, @1); }
		;

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

opt_boolean_or_string:
			TRUE_P									{ $$ = "true"; }
			| FALSE_P								{ $$ = "false"; }
			| ON									{ $$ = "on"; }
			/*
			 * OFF is also accepted as a boolean value, but is handled by
			 * the NonReservedWord rule.  The action for booleans and strings
			 * is the same, so we don't need to distinguish them here.
			 */
			| NonReservedWord_or_Sconst				{ $$ = $1; }
		;

/* 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 (meaning we reject anything that is a key word).
 */
zone_value:
			Sconst
				{
					$$ = makeStringConst($1, @1);
				}
			| IDENT
				{
					$$ = makeStringConst($1, @1);
				}
			| ConstInterval Sconst opt_interval
				{
					TypeName *t = $1;
					if ($3 != NIL)
					{
						A_Const *n = (A_Const *) linitial($3);
						if ((n->val.val.ival & ~(INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE))) != 0)
							ereport(ERROR,
									(errcode(ERRCODE_SYNTAX_ERROR),
									 errmsg("time zone interval must be HOUR or HOUR TO MINUTE"),
									 parser_errposition(@3)));
					}
					t->typmods = $3;
					$$ = makeStringConstCast($2, @2, t);
				}
			| ConstInterval '(' Iconst ')' Sconst opt_interval
				{
					TypeName *t = $1;
					if ($6 != NIL)
					{
						A_Const *n = (A_Const *) linitial($6);
						if ((n->val.val.ival & ~(INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE))) != 0)
							ereport(ERROR,
									(errcode(ERRCODE_SYNTAX_ERROR),
									 errmsg("time zone interval must be HOUR or HOUR TO MINUTE"),
									 parser_errposition(@6)));
						if (list_length($6) != 1)
							ereport(ERROR,
									(errcode(ERRCODE_SYNTAX_ERROR),
									 errmsg("interval precision specified twice"),
									 parser_errposition(@1)));
						t->typmods = lappend($6, makeIntConst($3, @3));
					}
					else
						t->typmods = list_make2(makeIntConst(INTERVAL_FULL_RANGE, -1),
												makeIntConst($3, @3));
					$$ = makeStringConstCast($5, @5, t);
				}
			| NumericOnly							{ $$ = makeAConst($1, @1); }
			| DEFAULT								{ $$ = NULL; }
			| LOCAL									{ $$ = NULL; }
		;

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

NonReservedWord_or_Sconst:
			NonReservedWord							{ $$ = $1; }
			| Sconst								{ $$ = $1; }
		;

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

/* SetResetClause allows SET or RESET without LOCAL */
SetResetClause:
			SET set_rest					{ $$ = $2; }
			| VariableResetStmt				{ $$ = (VariableSetStmt *) $1; }
		;

/* SetResetClause allows SET or RESET without LOCAL */
FunctionSetResetClause:
			SET set_rest_more				{ $$ = $2; }
			| VariableResetStmt				{ $$ = (VariableSetStmt *) $1; }
		;


VariableShowStmt:
			SHOW var_name
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name = $2;
					$$ = (Node *) n;
				}
			| SHOW TIME ZONE
				{
					VariableShowStmt *n = makeNode(VariableShowStmt);
					n->name = "timezone";
					$$ = (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;
				}
		;


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
				{
					Check…