diff --git a/src/backend/parser/gram.c b/src/backend/parser/gram.c
index e2e914239c598c9b4186673016873357f5159a63..3d090fed1c61fcd2592d53889088f31bf3159a3d 100644
--- a/src/backend/parser/gram.c
+++ b/src/backend/parser/gram.c
@@ -242,7 +242,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.76 1999/03/07 03:34:06 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.77 1999/03/14 05:14:59 momjian Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 7afc2d90075e1521ccb733199a829b168685ddcf..a94adbb00a551c2b9588ed5e662f79881ecab438 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.58 1999/03/07 03:34:10 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.59 1999/03/14 05:15:08 momjian Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -3702,6 +3702,8 @@ a_expr:  attr opt_indirection
 				{	$$ = makeA_Expr(OP, "<", $1, $3); }
 		| a_expr '>' a_expr
 				{	$$ = makeA_Expr(OP, ">", $1, $3); }
+  		| a_expr '=' NULL_P
+  				{	$$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
 		| a_expr '=' a_expr
 				{	$$ = makeA_Expr(OP, "=", $1, $3); }
 		| ':' a_expr