Merge polly.local:/tmp/maint/bug20293/my50-bug20293

into  polly.local:/home/kaa/src/maint/mysql-5.0-maint

mysql-test/r/func_time.result

@@ -1242,3 +1242,7 @@ t1	t2	SEC_TO_TIME( TIME_TO_SEC( t2 ) - TIME_TO_SEC( t1 ) )	QUARTER(d)
 11:00:00	11:15:00	00:15:00	1
 10:00:00	NULL	NULL	NULL
 DROP TABLE t1;
+SELECT TIME_FORMAT(SEC_TO_TIME(a),"%H:%i:%s") FROM (SELECT 3020399 AS a UNION SELECT 3020398 ) x GROUP BY 1;
+TIME_FORMAT(SEC_TO_TIME(a),"%H:%i:%s")
+838:59:58
+838:59:59

mysql-test/t/func_time.test

@@ -745,3 +745,10 @@ SELECT t1, t2, SEC_TO_TIME( TIME_TO_SEC( t2 ) - TIME_TO_SEC( t1 ) ), QUARTER(d)
 SELECT t1, t2, SEC_TO_TIME( TIME_TO_SEC( t2 ) - TIME_TO_SEC( t1 ) ), QUARTER(d)
   FROM t1 ORDER BY a DESC;
 DROP TABLE t1;
+
+#
+# Bug #20293: group by cuts off value from time_format
+#
+# Check if using GROUP BY with TIME_FORMAT() produces correct results
+
+SELECT TIME_FORMAT(SEC_TO_TIME(a),"%H:%i:%s") FROM (SELECT 3020399 AS a UNION SELECT 3020398 ) x GROUP BY 1;