Enable GEQO for more than six tables, from Martin.

src/backend/optimizer/path/allpaths.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *    $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.6 1997/04/29 04:37:22 vadim Exp $
+ *    $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.7 1997/06/01 02:55:44 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -173,7 +173,7 @@ find_join_paths(Query *root, List *outer_rels, int levels_left)
      *    <utesch@aut.tu-freiberg.de>          *
      *******************************************/
 
-    if ( _use_geqo_ )
+    if ( (_use_geqo_) || length(root->base_relation_list_) >= GEQO_RELS )
     	return lcons(geqo(root), NIL); /* returns *one* Rel, so lcons it */
 
      /*******************************************

src/include/optimizer/geqo.h

@@ -5,7 +5,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: geqo.h,v 1.1 1997/02/19 12:58:28 scrappy Exp $
+ * $Id: geqo.h,v 1.2 1997/06/01 02:56:00 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -38,6 +38,8 @@
  */
 #define ERX
 
+/* GEQO switch according to number of relations in a query */
+#define GEQO_RELS 7
 
 /* genetic algorithm parameters */