bk commit into 5.0 tree (igor:1.2370)

[igor]

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ChangeSet@stripped, 2007-01-09 12:07:13-08:00, igor@stripped +1 -0
  Merge ibabaev@stripped:/home/bk/mysql-5.0-opt
  into  olga.mysql.com:/home/igor/mysql-5.0-opt
  MERGE: 1.2368.1.2

  sql/item_cmpfunc.cc@stripped, 2007-01-09 12:07:10-08:00, igor@stripped +0 -0
    Auto merged
    MERGE: 1.224.1.4

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	igor
# Host:	olga.mysql.com
# Root:	/home/igor/mysql-5.0-opt/RESYNC

--- 1.227/sql/item_cmpfunc.cc	2007-01-09 12:07:19 -08:00
+++ 1.228/sql/item_cmpfunc.cc	2007-01-09 12:07:19 -08:00
@@ -2989,7 +2989,7 @@
     Handle optimization if the argument can't be null
     This has to be here because of the test in update_used_tables().
   */
-  if (!used_tables_cache)
+  if (!used_tables_cache && !with_subselect)
     return cached_value;
   return args[0]->is_null() ? 1: 0;
 }
@@ -2998,7 +2998,7 @@
 {
   DBUG_ASSERT(fixed == 1);
   DBUG_ENTER("Item_is_not_null_test::val_int");
-  if (!used_tables_cache)
+  if (!used_tables_cache && !with_subselect)
   {
     owner->was_null|= (!cached_value);
     DBUG_PRINT("info", ("cached :%ld", (long) cached_value));
@@ -3025,7 +3025,7 @@
   else
   {
     args[0]->update_used_tables();
-    if (!(used_tables_cache=args[0]->used_tables()))
+    if (!(used_tables_cache=args[0]->used_tables()) && !with_subselect)
     {
       /* Remember if the value is always NULL or never NULL */
       cached_value= (longlong) !args[0]->is_null();