Adds in NO MAXVALUE and NO MINVALUE options for create sequence per 200X

spec, which will also make alter sequence a touch easier.

sequence.c  init_params() will check for settings which have been
defined twice, and complain.

Rod Taylor

src/backend/parser/gram.y

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.402 2003/02/13 05:19:59 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.403 2003/02/13 05:25:24 momjian Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -1909,6 +1909,14 @@ OptSeqElem: CACHE NumericOnly
 				{
 					$$ = makeDefElem("minvalue", (Node *)$2);
 				}
+			| NO MAXVALUE
+				{
+					$$ = makeDefElem("maxvalue", (Node *)NULL);
+				}
+			| NO MINVALUE
+				{
+					$$ = makeDefElem("minvalue", (Node *)NULL);
+				}
 			| START opt_with NumericOnly
 				{
 					$$ = makeDefElem("start", (Node *)$3);