bk commit into 5.0 tree (sergefp:1.2114)

[Sergey Petrunia]

Below is the list of changes that have just been committed into a local
5.0 repository of psergey. When psergey does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
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ChangeSet
  1.2114 06/05/06 13:19:09 sergefp@stripped +1 -0
  Merge mysql.com:/home/psergey/mysql-4.1-bug16798
  into mysql.com:/home/psergey/mysql-5.0-bug16798-merge

  sql/sql_select.cc
    1.410 06/05/06 13:19:05 sergefp@stripped +0 -0
    Auto merged

# 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:	sergefp
# Host:	newbox.mylan
# Root:	/home/psergey/mysql-5.0-bug16798-merge/RESYNC

--- 1.409/sql/sql_select.cc	2006-05-04 06:38:30 +04:00
+++ 1.410/sql/sql_select.cc	2006-05-06 13:19:05 +04:00
@@ -2407,7 +2407,8 @@
                                 new_fields->null_rejecting);
 	}
 	else if (old->eq_func && new_fields->eq_func &&
-		 (old->val->is_null() || new_fields->val->is_null()))
+		 ((!old->val->used_tables() && old->val->is_null()) || 
+                  new_fields->val->is_null()))
 	{
 	  /* field = expression OR field IS NULL */
 	  old->level= and_level;