# # MDEV-4265 5.5 is slower than 5.3 because of many str_to_datetime calls # --source include/have_debug.inc create table t1 (a date); insert t1 values ('2000-01-02'), ('2001-02-03'), ('2002-03-04'); SET STATEMENT debug_dbug='d,str_to_datetime_warn' for select * from t1 where a > date_add('2000-01-01', interval 5 day); drop table t1; # # MDEV-9707 MAX(timestamp(6) column) in correlated sub-query returns non-existent row data in original table # create table t1 (id int not null, ut timestamp(6) not null); insert into t1 values(1, '2001-01-01 00:00:00.2'); insert into t1 values(1, '2001-01-01 00:00:00.1'); select * from t1; select (select max(m2.ut) from t1 m2 where m1.id <> 0) from t1 m1; drop table t1;