diff -c -r --new-file pgsql.new/src/backend/parser/gram.y pgsql.old/src/backend/parser/gram.y
*** pgsql.old/src/backend/parser/gram.y	2005-05-07 04:22:46.000000000 +0200
--- pgsql.new/src/backend/parser/gram.y	2005-06-01 00:05:37.000000000 +0200
***************
*** 338,344 ****
  /* ordinary key words in alphabetical order */
  %token <keyword> ABORT_P ABSOLUTE_P ACCESS ACTION ADD AFTER
  	AGGREGATE ALL ALSO ALTER ANALYSE ANALYZE AND ANY ARRAY AS ASC
! 	ASSERTION ASSIGNMENT AT AUTHORIZATION
  
  	BACKWARD BEFORE BEGIN_P BETWEEN BIGINT BINARY BIT
  	BOOLEAN_P BOTH BY
--- 338,344 ----
  /* ordinary key words in alphabetical order */
  %token <keyword> ABORT_P ABSOLUTE_P ACCESS ACTION ADD 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
***************
*** 399,405 ****
  	SAVEPOINT SCHEMA SCROLL SECOND_P SECURITY SELECT SEQUENCE
  	SERIALIZABLE SESSION SESSION_USER SET SETOF SHARE
  	SHOW SIMILAR SIMPLE SMALLINT SOME STABLE START STATEMENT
! 	STATISTICS STDIN STDOUT STORAGE STRICT_P SUBSTRING SYSID
  
  	TABLE TABLESPACE TEMP TEMPLATE TEMPORARY THEN TIME TIMESTAMP
  	TO TOAST TRAILING TRANSACTION TREAT TRIGGER TRIM TRUE_P
--- 399,406 ----
  	SAVEPOINT SCHEMA SCROLL SECOND_P SECURITY SELECT SEQUENCE
  	SERIALIZABLE SESSION SESSION_USER SET SETOF SHARE
  	SHOW SIMILAR SIMPLE SMALLINT SOME STABLE START STATEMENT
! 	STATISTICS STDIN STDOUT STORAGE STRICT_P SUBSTRING SYMMETRIC
! 	SYSID
  
  	TABLE TABLESPACE TEMP TEMPLATE TEMPORARY THEN TIME TIMESTAMP
  	TO TOAST TRAILING TRANSACTION TREAT TRIGGER TRIM TRUE_P
***************
*** 6341,6358 ****
  				{
  					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "!=", $1, (Node *) $6);
  				}
! 			| a_expr BETWEEN b_expr AND b_expr			%prec BETWEEN
  				{
  					$$ = (Node *) makeA_Expr(AEXPR_AND, NIL,
! 						(Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $3),
! 						(Node *) makeSimpleA_Expr(AEXPR_OP, "<=", $1, $5));
  				}
! 			| a_expr NOT BETWEEN b_expr AND b_expr		%prec BETWEEN
  				{
  					$$ = (Node *) makeA_Expr(AEXPR_OR, NIL,
! 						(Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $4),
! 						(Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $6));
  				}
  			| a_expr IN_P in_expr
  				{
  					/* in_expr returns a SubLink or a list of a_exprs */
--- 6342,6382 ----
  				{
  					$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "!=", $1, (Node *) $6);
  				}
! 			| a_expr BETWEEN opt_asymmetric b_expr AND b_expr			%prec BETWEEN
  				{
  					$$ = (Node *) makeA_Expr(AEXPR_AND, NIL,
! 						(Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $4),
! 						(Node *) makeSimpleA_Expr(AEXPR_OP, "<=", $1, $6));
  				}
! 			| a_expr NOT BETWEEN opt_asymmetric b_expr AND b_expr		%prec BETWEEN
  				{
  					$$ = (Node *) makeA_Expr(AEXPR_OR, NIL,
! 						(Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $5),
! 						(Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $7));
  				}
+ 				
+ 			| a_expr BETWEEN SYMMETRIC b_expr AND b_expr			%prec BETWEEN
+ 				{
+ 					$$ = (Node *) makeA_Expr(AEXPR_OR, NIL,
+ 						(Node *) makeA_Expr(AEXPR_AND, NIL,
+ 						    (Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $4),
+ 						    (Node *) makeSimpleA_Expr(AEXPR_OP, "<=", $1, $6)),
+ 						(Node *) makeA_Expr(AEXPR_AND, NIL,
+ 						    (Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $6),
+ 						    (Node *) makeSimpleA_Expr(AEXPR_OP, "<=", $1, $4)));					
+ 				}
+ 			| a_expr NOT BETWEEN SYMMETRIC b_expr AND b_expr		%prec BETWEEN
+ 				{
+ 					$$ = (Node *) makeA_Expr(AEXPR_OR, NIL,
+ 						(Node *) makeA_Expr(AEXPR_AND, NIL,
+ 						    (Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $5),
+ 						    (Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $7)),
+ 						(Node *) makeA_Expr(AEXPR_AND, NIL,
+ 						    (Node *) makeSimpleA_Expr(AEXPR_OP, "<", $1, $7),
+ 						    (Node *) makeSimpleA_Expr(AEXPR_OP, ">", $1, $5)));					
+ 				}
+ 				
+ 				
  			| a_expr IN_P in_expr
  				{
  					/* in_expr returns a SubLink or a list of a_exprs */
***************
*** 6451,6456 ****
--- 6475,6485 ----
  				}
  		;
  
+ opt_asymmetric:		ASYMMETRIC									{}
+ 			    | /*EMPTY*/								{}
+ 		;
+ 
+ 
  /*
   * Restricted expressions
   *
diff -c -r --new-file pgsql.old/src/backend/parser/keywords.c pgsql.new/src/backend/parser/keywords.c
*** pgsql.old/src/backend/parser/keywords.c	2005-05-07 04:22:47.000000000 +0200
--- pgsql.new/src/backend/parser/keywords.c	2005-05-31 22:39:44.000000000 +0200
***************
*** 49,54 ****
--- 49,55 ----
  	{"asc", ASC},
  	{"assertion", ASSERTION},
  	{"assignment", ASSIGNMENT},
+ 	{"asymmetric", ASYMMETRIC},
  	{"at", AT},
  	{"authorization", AUTHORIZATION},
  	{"backward", BACKWARD},
***************
*** 296,301 ****
--- 297,303 ----
  	{"storage", STORAGE},
  	{"strict", STRICT_P},
  	{"substring", SUBSTRING},
+ 	{"symmetric", SYMMETRIC},
  	{"sysid", SYSID},
  	{"table", TABLE},
  	{"tablespace", TABLESPACE},