Reimplementation of UNION/INTERSECT/EXCEPT. INTERSECT/EXCEPT now meet the

SQL92 semantics, including support for ALL option.  All three can be used
in subqueries and views.  DISTINCT and ORDER BY work now in views, too.
This rewrite fixes many problems with cross-datatype UNIONs and INSERT/SELECT
where the SELECT yields different datatypes than the INSERT needs.  I did
that by making UNION subqueries and SELECT in INSERT be treated like
subselects-in-FROM, thereby allowing an extra level of targetlist where the
datatype conversions can be inserted safely.
INITDB NEEDED!

1 files changed, 4 insertions, 4 deletions

diff --git a/src/backend/optimizer/util/var.c b/src/backend/optimizer/util/var.c
index ec9f9dafd0b..a18db71ec55 100644
--- a/src/backend/optimizer/util/var.c
+++ b/src/backend/optimizer/util/var.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.27 2000/09/12 21:06:59 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.28 2000/10/05 19:11:32 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -67,7 +67,7 @@ pull_varnos(Node *node)
 	 */
 	if (node && IsA(node, Query))
 		query_tree_walker((Query *) node, pull_varnos_walker,
-						  (void *) &context);
+						  (void *) &context, true);
 	else
 		pull_varnos_walker(node, &context);
 
@@ -108,12 +108,12 @@ pull_varnos_walker(Node *node, pull_varnos_context *context)
 	}
 	if (IsA(node, Query))
 	{
-		/* Recurse into not-yet-planned subquery */
+		/* Recurse into RTE subquery or not-yet-planned sublink subquery */
 		bool		result;
 
 		context->sublevels_up++;
 		result = query_tree_walker((Query *) node, pull_varnos_walker,
-								   (void *) context);
+								   (void *) context, true);
 		context->sublevels_up--;
 		return result;
 	}