diff options
Diffstat (limited to 'mysql-test')
| -rw-r--r-- | mysql-test/r/update.result | 59 | ||||
| -rw-r--r-- | mysql-test/t/update.test | 29 |
2 files changed, 88 insertions, 0 deletions
diff --git a/mysql-test/r/update.result b/mysql-test/r/update.result index 9ca6370dff6..d2aa051c299 100644 --- a/mysql-test/r/update.result +++ b/mysql-test/r/update.result @@ -263,3 +263,62 @@ test delete from t1 where count(*)=1; ERROR HY000: Invalid use of group function drop table t1; +create table t1 ( a int, index (a) ); +insert into t1 values (0),(0),(0),(0),(0),(0),(0),(0); +flush status; +select a from t1 order by a limit 1; +a +0 +show status like 'handler_read%'; +Variable_name Value +Handler_read_first 1 +Handler_read_key 0 +Handler_read_next 0 +Handler_read_prev 0 +Handler_read_rnd 0 +Handler_read_rnd_next 0 +flush status; +update t1 set a=unix_timestamp() order by a limit 1; +show status like 'handler_read%'; +Variable_name Value +Handler_read_first 1 +Handler_read_key 0 +Handler_read_next 0 +Handler_read_prev 0 +Handler_read_rnd 1 +Handler_read_rnd_next 0 +flush status; +delete from t1 order by a limit 1; +show status like 'handler_read%'; +Variable_name Value +Handler_read_first 1 +Handler_read_key 0 +Handler_read_next 0 +Handler_read_prev 0 +Handler_read_rnd 0 +Handler_read_rnd_next 0 +flush status; +delete from t1 order by a desc limit 1; +show status like 'handler_read%'; +Variable_name Value +Handler_read_first 0 +Handler_read_key 0 +Handler_read_next 0 +Handler_read_prev 0 +Handler_read_rnd 1 +Handler_read_rnd_next 9 +alter table t1 disable keys; +flush status; +delete from t1 order by a limit 1; +show status like 'handler_read%'; +Variable_name Value +Handler_read_first 0 +Handler_read_key 0 +Handler_read_next 0 +Handler_read_prev 0 +Handler_read_rnd 1 +Handler_read_rnd_next 9 +select count(*) from t1; +count(*) +5 +drop table t1; diff --git a/mysql-test/t/update.test b/mysql-test/t/update.test index 3822d1fe4e7..13ced76079f 100644 --- a/mysql-test/t/update.test +++ b/mysql-test/t/update.test @@ -227,4 +227,33 @@ select DATABASE(); delete from t1 where count(*)=1; drop table t1; +# BUG#12915: Optimize "DELETE|UPDATE ... ORDER BY ... LIMIT n" to use an index +create table t1 ( a int, index (a) ); +insert into t1 values (0),(0),(0),(0),(0),(0),(0),(0); + +flush status; +select a from t1 order by a limit 1; +show status like 'handler_read%'; + +flush status; +update t1 set a=unix_timestamp() order by a limit 1; +show status like 'handler_read%'; + +flush status; +delete from t1 order by a limit 1; +show status like 'handler_read%'; + +flush status; +delete from t1 order by a desc limit 1; +show status like 'handler_read%'; + +alter table t1 disable keys; + +flush status; +delete from t1 order by a limit 1; +show status like 'handler_read%'; + +select count(*) from t1; + +drop table t1; # End of 4.1 tests |