From f0ae3a4c87d54d33bed0b059693d5265c542c067 Mon Sep 17 00:00:00 2001
From: unknown <serg@sergbook.mysql.com>
Date: Wed, 31 Jul 2002 15:09:31 +0200
Subject: [PATCH] fix for a nasty bag, that causes a memory corruption+crash on
 HUGE select distincts, as myisam temp table treats nulls as equal, it
 constantly returned 141 (duplicate key) error in create_myisam_from_heap

---
 sql/sql_select.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index adfccfce68a..f20cf973a3d 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -3885,7 +3885,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
       goto err;
     table->key_info=keyinfo;
     keyinfo->key_part=key_part_info;
-    keyinfo->flags=HA_NOSAME;
+    keyinfo->flags=HA_NOSAME|HA_NULL_ARE_EQUAL;
     keyinfo->key_length=(uint16) reclength;
     keyinfo->name=(char*) "tmp";
     if (null_pack_length)