Fix errors in SELECT ... GROUP BY ... UNION SELECT ...

ye proverbial one-line patch (not counting five lines of comment so's
maybe it won't happen again)

diff --git a/src/backend/optimizer/prep/prepunion.c b/src/backend/optimizer/prep/prepunion.c
index 478186b631bdd84de393a099420d83709f6ea859..9ae2fb57a8915822abe47196a1535e637b076bac 100644 (file)
--- a/src/backend/optimizer/prep/prepunion.c
+++ b/src/backend/optimizer/prep/prepunion.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *   $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.32 1999/06/06 17:38:11 tgl Exp $
+ *   $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.33 1999/06/10 06:55:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -192,6 +192,13 @@ plan_union_queries(Query *parse)
        /* needed so we don't take the flag from the first query */
        parse->uniqueFlag = NULL;
 
+   /* Make sure we don't try to apply the first query's grouping stuff
+    * to the Append node, either.  Basically we don't want union_planner
+    * to do anything when we return control, except add the top sort/unique
+    * nodes for DISTINCT processing if this wasn't UNION ALL, or the top
+    * sort node if it was UNION ALL with a user-provided sort clause.
+    */
+   parse->groupClause = NULL;
    parse->havingQual = NULL;
    parse->hasAggs = false;