drop table if exists t; create table t (s UInt16, l UInt16, projection p (select s, l order by l)) engine MergeTree order by s; select s from t join (select toUInt16(1) as s) x using (s) order by s settings allow_experimental_projection_optimization = 1; select s from t join (select toUInt16(1) as s) x using (s) order by s settings allow_experimental_projection_optimization = 0; drop table t; drop table if exists mt; create table mt (id1 Int8, id2 Int8) Engine=MergeTree order by tuple(); select alias1 from (select id1, id1 as alias1 from mt) as l all inner join (select id2 as alias1 from mt) as t using (alias1) order by l.id1 settings allow_experimental_projection_optimization = 1; select id1 from mt all inner join (select id2 as id1 from mt) as t using (id1) order by id1 settings allow_experimental_projection_optimization = 1; select id2 as id1 from mt all inner join (select id1 from mt) as t using (id1) order by id1 settings allow_experimental_projection_optimization = 1; drop table mt; drop table if exists j; create table j (id1 Int8, id2 Int8, projection p (select id1, id2 order by id2)) Engine=MergeTree order by id1 settings index_granularity = 1; insert into j select number, number from numbers(10); select alias1 from (select id1, id1 as alias1 from j) as l all inner join (select id2, id2 as alias1 from j where id2 in (1, 2, 3)) as t using (alias1) where id2 in (2, 3, 4) order by id1 settings allow_experimental_projection_optimization = 1; drop table j;