Back-patch fix for NOT-below-a-NOT case.

diff --git a/src/backend/optimizer/prep/prepqual.c b/src/backend/optimizer/prep/prepqual.c
index 8d92ee317a04e105b51b6e86bc32d6e1d7e1e356..de72ad8141b724d00227712c3a58bba5c755c2c5 100644 (file)
--- a/src/backend/optimizer/prep/prepqual.c
+++ b/src/backend/optimizer/prep/prepqual.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/optimizer/prep/prepqual.c,v 1.48 2004/12/31 22:00:20 pgsql Exp $
+ *       $PostgreSQL: pgsql/src/backend/optimizer/prep/prepqual.c,v 1.48.4.1 2005/07/29 21:40:26 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -335,9 +335,10 @@ push_nots(Expr *qual)
        {
                /*
                 * Another NOT cancels this NOT, so eliminate the NOT and stop
-                * negating this branch.
+                * negating this branch.  But search the subexpression for more
+                * NOTs to simplify.
                 */
-               return get_notclausearg(qual);
+               return find_nots(get_notclausearg(qual));
        }
        else
        {