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Diffstat (limited to 'mysql-test/t/update.test')
| -rw-r--r-- | mysql-test/t/update.test | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/mysql-test/t/update.test b/mysql-test/t/update.test index 3822d1fe4e7..2a151f0dd38 100644 --- a/mysql-test/t/update.test +++ b/mysql-test/t/update.test @@ -227,4 +227,47 @@ 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, b int default 0, index (a) ); +insert into t1 (a) 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=9999 order by a limit 1; +update t1 set b=9999 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 * from t1; +update t1 set a=a+10,b=1 order by a limit 3; +update t1 set a=a+11,b=2 order by a limit 3; +update t1 set a=a+12,b=3 order by a limit 3; +select * from t1 order by a; + +drop table t1; + +# +# Bug#14186 select datefield is null not updated +# +create table t1 (f1 date not null); +insert into t1 values('2000-01-01'),('0000-00-00'); +update t1 set f1='2002-02-02' where f1 is null; +select * from t1; +drop table t1; # End of 4.1 tests |