Eliminate a gratuitously different wording of the 'cannot use aggregate...

Eliminate a gratuitously different wording of the 'cannot use aggregate function in check constraint' error message.

src/backend/commands/typecmds.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/typecmds.c,v 1.90 2006/04/05 22:11:55 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/typecmds.c,v 1.91 2006/06/21 18:09:53 tgl Exp $
  *
  * DESCRIPTION
  *	  The "DefineFoo" routines take the parse tree and pick out the
@@ -1841,7 +1841,7 @@ domainAddConstraint(Oid domainOid, Oid domainNamespace, Oid baseTypeOid,
 	if (pstate->p_hasAggs)
 		ereport(ERROR,
 				(errcode(ERRCODE_GROUPING_ERROR),
-				 errmsg("cannot use aggregate in check constraint")));
+				 errmsg("cannot use aggregate function in check constraint")));
 
 	/*
 	 * Convert to string form for storage.