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; -- fuzz crash select min(i) from d where 1 = _partition_value.1; drop table d; drop table if exists has_final_mark; drop table if exists mixed_final_mark; create table has_final_mark (i int, j int) engine MergeTree partition by i % 2 order by j settings index_granularity = 10, write_final_mark = 1; create table mixed_final_mark (i int, j int) engine MergeTree partition by i % 2 order by j settings index_granularity = 10; set max_rows_to_read = 100000; insert into has_final_mark select number, number from numbers(10000); alter table mixed_final_mark attach partition 1 from has_final_mark; set max_rows_to_read = 2; select min(j) from has_final_mark; select min(j) from mixed_final_mark; select min(j), max(j) from has_final_mark; set max_rows_to_read = 5001; -- one normal part 5000 + one minmax_count_projection part 1 select min(j), max(j) from mixed_final_mark; -- The first primary expr is the same of some partition column drop table if exists t; create table t (server_date Date, something String) engine MergeTree partition by (toYYYYMM(server_date), server_date) order by (server_date, something); insert into t values ('2019-01-01', 'test1'), ('2019-02-01', 'test2'), ('2019-03-01', 'test3'); select count() from t;