From 81503e476ade009fcfed2bb0d31e2615fcc1319e Mon Sep 17 00:00:00 2001
From: "monty@hundin.mysql.fi" <>
Date: Fri, 8 Nov 2002 09:58:28 +0200
Subject: [PATCH] Fixed rare core dump bug when using complicated GROUP BY
 query that didn't return any results. This only showed up under heavy load.

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

diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 0c3c19c6e69..3596fdc0c05 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -4970,6 +4970,8 @@ end_write_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
     }
     else
     {
+      if (end_of_records)
+	DBUG_RETURN(0);
       join->first_record=1;
       VOID(test_if_group_changed(join->group_fields));
     }