1 files changed, 9 insertions, 1 deletions
diff --git a/src/backend/optimizer/prep/prepunion.c b/src/backend/optimizer/prep/prepunion.c
index 03674e8990f..d14c3c98e1f 100644
--- a/src/backend/optimizer/prep/prepunion.c
+++ b/src/backend/optimizer/prep/prepunion.c
@@ -14,7 +14,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.97 2003/06/29 23:05:04 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.98 2003/07/16 17:25:48 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -85,6 +85,14 @@ plan_set_operations(Query *parse)
 
 	Assert(topop && IsA(topop, SetOperationStmt));
 
+	/* check for unsupported stuff */
+	Assert(parse->utilityStmt == NULL);
+	Assert(parse->jointree->fromlist == NIL);
+	Assert(parse->jointree->quals == NULL);
+	Assert(parse->groupClause == NIL);
+	Assert(parse->havingQual == NULL);
+	Assert(parse->distinctClause == NIL);
+
 	/*
 	 * Find the leftmost component Query.  We need to use its column names
 	 * for all generated tlists (else SELECT INTO won't work right).