Consider right-sided plans if _use_right_sided_plans_ is true.

diff --git a/src/backend/optimizer/path/joinrels.c b/src/backend/optimizer/path/joinrels.c
index 2632fc39514691dd196795b0d30ad792ba8d418d..a640988b50db09acc51695c6b7b9dcaac4d54e81 100644 (file)
--- a/src/backend/optimizer/path/joinrels.c
+++ b/src/backend/optimizer/path/joinrels.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *    $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.2 1997/02/20 02:54:09 vadim Exp $
+ *    $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.3 1997/05/20 10:37:26 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -23,6 +23,11 @@
 #include "optimizer/joininfo.h"
 #include "optimizer/pathnode.h"
 
+#ifdef USE_RIGHT_SIDED_PLANS
+bool _use_right_sided_plans_ = true;
+#else
+bool _use_right_sided_plans_ = false;
+#endif
 
 static List *find_clause_joins(Query *root, Rel *outer_rel, List *joininfo_list);
 static List *find_clauseless_joins(Rel *outer_rel, List *inner_rels);
@@ -104,6 +109,15 @@ find_clause_joins(Query *root, Rel *outer_rel, List *joininfo_list)
                    rel = init_join_rel(outer_rel,
                                        get_base_rel(root, lfirsti(other_rels)),
                                        joininfo);
+                   /* how about right-sided plan ? */
+                   if ( _use_right_sided_plans_ )
+                   {
+                       if (rel != NULL)
+                           join_list = lappend(join_list, rel);
+                       rel = init_join_rel(get_base_rel(root, lfirsti(other_rels)),
+                                               outer_rel,
+                                               joininfo);
+                   }
                } else if (BushyPlanFlag) {
                    rel = init_join_rel(outer_rel,
                                        get_join_rel(root, other_rels),