From 8838c971fa6ced3a8cb90c154bc5b9e0ec4bfba5 Mon Sep 17 00:00:00 2001
From: unknown <ram@gw.mysql.r18.ru>
Date: Fri, 3 Sep 2004 19:59:29 +0500
Subject: A fix (Bug #4980: union statement with () union () order by produces
 wrong explain).

---
 sql/sql_union.cc | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'sql/sql_union.cc')

diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index 8088737c0de..f79ff7967db 100644
--- a/sql/sql_union.cc
+++ b/sql/sql_union.cc
@@ -148,6 +148,10 @@ int mysql_union(THD *thd, LEX *lex,select_result *result)
   {
     ha_rows records_at_start;
     lex->select=sl;
+#if MYSQL_VERSION_ID < 40100
+    if (describe && sl->linkage == NOT_A_SELECT)
+      break;      // Skip extra item in case of 'explain'
+#endif
     /* Don't use offset for the last union if there is no braces */
     if (sl != lex_sl)
     {
-- 
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