drop table if exists d; create table d (i int, j int) engine MergeTree partition by i % 2 order by tuple() settings index_granularity = 1; insert into d select number, number from numbers(10000); set max_rows_to_read = 2, allow_experimental_projection_optimization = 1; select min(i), max(i), count() from d; select min(i), max(i), count() from d group by _partition_id order by _partition_id; select min(i), max(i), count() from d where _partition_value.1 = 0 group by _partition_id order by _partition_id; select min(i), max(i), count() from d where _partition_value.1 = 10 group by _partition_id order by _partition_id; drop table d;