set send_logs_level = 'none'; drop table if exists test.ttl; create table test.ttl (d Date, a Int) engine = MergeTree order by a partition by toDayOfMonth(d); alter table test.ttl modify ttl d + interval 1 day; show create table test.ttl; insert into test.ttl values (toDateTime('2000-10-10 00:00:00'), 1); insert into test.ttl values (toDateTime('2000-10-10 00:00:00'), 2); insert into test.ttl values (toDateTime('2100-10-10 00:00:00'), 3); insert into test.ttl values (toDateTime('2100-10-10 00:00:00'), 4); select sleep(1) format Null; -- wait if very fast merge happen optimize table test.ttl partition 10 final; select * from test.ttl order by d; alter table test.ttl modify ttl a; -- { serverError 450 } drop table if exists test.ttl; create table test.ttl (d Date, a Int) engine = MergeTree order by tuple() partition by toDayOfMonth(d); alter table test.ttl modify column a Int ttl d + interval 1 day; desc table test.ttl; alter table test.ttl modify column d Int ttl d + interval 1 day; -- { serverError 44}