once 30000 1 aggregationscale 11111111 11111 create table mingroupby_orderbylimit1_{aggregationscale}_tuple Engine=MergeTree order by tuple() AS select toUInt64( number % {aggregationscale} ) key, toUInt64(1) value from numbers(10000000); create table mingroupby_orderbylimit1_{aggregationscale}_key_value Engine=MergeTree order by (key,value) AS select toUInt64( number % {aggregationscale} ) key, toUInt64(1) value from numbers(10000000); SELECT key, min(value) FROM mingroupby_orderbylimit1_{aggregationscale}_tuple group by key format Null; SELECT key, min(value) FROM mingroupby_orderbylimit1_{aggregationscale}_key_value group by key format Null; SELECT key, value FROM mingroupby_orderbylimit1_{aggregationscale}_tuple order by key, value limit 1 by key format Null; SELECT key, value FROM mingroupby_orderbylimit1_{aggregationscale}_key_value order by key, value limit 1 by key format Null; DROP TABLE IF EXISTS mingroupby_orderbylimit1_{aggregationscale}_tuple DROP TABLE IF EXISTS mingroupby_orderbylimit1_{aggregationscale}_key_value