diff options
Diffstat (limited to 'mysql-test/t/innodb_ext_key.test')
| -rw-r--r-- | mysql-test/t/innodb_ext_key.test | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/mysql-test/t/innodb_ext_key.test b/mysql-test/t/innodb_ext_key.test index d62217dd54f..9f3a89ff948 100644 --- a/mysql-test/t/innodb_ext_key.test +++ b/mysql-test/t/innodb_ext_key.test @@ -663,6 +663,34 @@ ORDER BY rev_timestamp ASC LIMIT 10; DROP TABLE t1,t2,t3; +--echo # +--echo # MDEV-5424 SELECT using ORDER BY DESC and LIMIT produces unexpected +--echo # results (InnoDB/XtraDB) +--echo # + +create table t1 (a bigint not null unique auto_increment, b varchar(10), primary key (a), key (b(2))) engine = myisam default character set utf8; +create table t2 (a bigint not null unique auto_increment, b varchar(10), primary key (a), key (b(2))) engine = innodb default character set utf8; + +insert into t1 (b) values (null), (null), (null); +insert into t2 (b) values (null), (null), (null); + +set optimizer_switch='extended_keys=on'; +explain select a from t1 where b is null order by a desc limit 2; +select a from t1 where b is null order by a desc limit 2; +explain select a from t2 where b is null order by a desc limit 2; +select a from t2 where b is null order by a desc limit 2; +set optimizer_switch='extended_keys=off'; +explain select a from t2 where b is null order by a desc limit 2; +select a from t2 where b is null order by a desc limit 2; + +explain select a from t2 where b is null order by a desc; +select a from t2 where b is null order by a desc; + +explain select a from t2 where b is null order by a desc,a,a; +select a from t2 where b is null order by a desc,a,a; + +drop table t1, t2; + set optimizer_switch=@save_optimizer_switch; set optimizer_switch=@save_ext_key_optimizer_switch; |