1 files changed, 21 insertions, 0 deletions
diff --git a/mysql-test/t/group_by.test b/mysql-test/t/group_by.test
index bc01577c249..98b1ee238b1 100644
--- a/mysql-test/t/group_by.test
+++ b/mysql-test/t/group_by.test
@@ -36,8 +36,10 @@ INSERT INTO t2 VALUES (2,'name','pass','mail','Y','v','n','adr','1','1','1');
 INSERT INTO t2 VALUES (3,'name','pass','mail','Y','v','n','adr','1','1','1');
 
 SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID GROUP BY t2.userid;
+SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID GROUP BY t2.userid ORDER BY NULL;
 SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2  GROUP BY t2.userid;
 SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2  GROUP BY t2.userid;
+SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2  GROUP BY t2.userid ORDER BY NULL;
 drop table test.t1,test.t2;
 
 #
@@ -100,6 +102,7 @@ INSERT INTO t2 VALUES (91,2);
 INSERT INTO t2 VALUES (92,2);
 
 SELECT cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid;
+SELECT cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid ORDER BY NULL;
 SELECT HIGH_PRIORITY cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid ORDER BY surname, firstname;
 
 drop table t1,t2;
@@ -234,16 +237,20 @@ CREATE TABLE t1 (
 
 INSERT INTO t1 VALUES (1,1,1),(2,2,2),(2,1,1),(3,3,3),(4,3,3),(5,3,3);
 explain select userid,count(*) from t1 group by userid desc;
+explain select userid,count(*) from t1 group by userid desc order by null;
 select userid,count(*) from t1 group by userid desc;
 select userid,count(*) from t1 group by userid desc having (count(*)+1) IN (4,3);
 select userid,count(*) from t1 group by userid desc having 3  IN (1,COUNT(*));
 explain select spid,count(*) from t1 where spid between 1 and 2 group by spid desc;
 explain select spid,count(*) from t1 where spid between 1 and 2 group by spid;
+explain select spid,count(*) from t1 where spid between 1 and 2 group by spid order by null;
 select spid,count(*) from t1 where spid between 1 and 2 group by spid;
 select spid,count(*) from t1 where spid between 1 and 2 group by spid desc;
 explain select sql_big_result spid,sum(userid) from t1 group by spid desc;
+explain select sql_big_result spid,sum(userid) from t1 group by spid desc order by null;
 select sql_big_result spid,sum(userid) from t1 group by spid desc;
 explain select sql_big_result score,count(*) from t1 group by score desc;
+explain select sql_big_result score,count(*) from t1 group by score desc order by null;
 select sql_big_result score,count(*) from t1 group by score desc;
 drop table t1;
 
@@ -365,3 +372,17 @@ select a,count(*) from t1 group by a;
 set option sql_big_tables=1;
 select a,count(*) from t1 group by a;
 drop table t1;
+
+#
+# Test of GROUP BY ... ORDER BY NULL optimization
+#
+
+create table t1 (a int not null, b int not null);
+insert into t1 values (1,1),(1,2),(3,1),(3,2),(2,2),(2,1);
+create table t2 (a int not null, b int not null, key(a));
+insert into t2 values (1,3),(3,1),(2,2),(1,1);
+select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b;
+select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b ORDER BY NULL;
+explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b;
+explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b ORDER BY NULL;
+drop table t1,t2;