# TestQueryTime
set @a = now(6);
drop table if exists t;
create table t(a int);
insert into t values (1), (1), (1), (1), (1);
select * from t t1 join t t2 on t1.a = t2.a;
## should less than 1 second
select timestampdiff(microsecond, @a, now(6)) < 1000000;