text: drop table if exists tab1;
  drop table if exists tab2;
  drop table if exists tab3;
  drop table if exists tab1_copy;
  
  create table tab1 (a1 Int32, b1 Int32) engine = MergeTree order by a1;
  create table tab2 (a2 Int32, b2 Int32) engine = MergeTree order by a2;
  create table tab3 (a3 Int32, b3 Int32) engine = MergeTree order by a3;
  create table tab1_copy (a1 Int32, b1 Int32) engine = MergeTree order by a1;
  
  insert into tab1 values (1, 2);
  insert into tab2 values (2, 3);
  insert into tab3 values (2, 3);
  insert into tab1_copy values (2, 3);
  
  
  select 'joind columns from right table';
  select a1 from tab1 any left join tab2 on b1 = a2;
  select a1, b1 from tab1 any left join tab2 on b1 = a2;
  select a1, a2 from tab1 any left join tab2 on b1 = a2;
  select a1, b2 from tab1 any left join tab2 on b1 = a2;
  select a1, a2, b2 from tab1 any left join tab2 on b1 = a2;
  
  
  select 'join on expression';
  select b1 from tab1 any left join tab2 on toInt32(a1 + 1) = a2;
  select b1, a2 from tab1 any left join tab2 on toInt32(a1 + 1) = a2;
  select b1, b2 from tab1 any left join tab2 on toInt32(a1 + 1) = a2;
  select a1 from tab1 any left join tab2 on b1 + 1 = a2 + 1;
  select a2 from tab1 any left join tab2 on b1 + 1 = a2 + 1;
  select a1, b1, a2, b2 from tab1 any left join tab2 on b1 + 1 = a2 + 1;
  select a1, b1, a2, b2, a2 + 1 from tab1 any left join tab2 on b1 + 1 = a2 + 1;
  select a1, b1, a2, b2 from tab1 any left join tab2 on a1 + 4 = b2 + 2;
  
  
  select 'join on and chain';
  select a2, b2 from tab2 any left join tab3 on a2 = a3 and b2 = b3;
  select a3, b3 from tab2 any left join tab3 on a2 = a3 and b2 = b3;
  select a2, b2, a3, b3 from tab2 any left join tab3 on a2 = a3 and b2 = b3;
  select a1 from tab1 any left join tab2 on b1 + 1 = a2 + 1 and a1 + 4 = b2 + 2;
  select a1, b2 from tab1 any left join tab2 on b1 + 1 = a2 + 1 and a1 + 4 = b2 + 2;
  select a1, b1, a2, b2 from tab1 any left join tab2 on b1 + 1 = a2 + 1 and a1 + 4 = b2 + 2;
  select a2, b2 + 1 from tab1 any left join tab2 on b1 + 1 = a2 + 1 and a1 + 4 = b2 + 2;
  
  
  select 'join on aliases';
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on first.b1 = second.a2;
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on second.a2 = first.b1;
  
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on tab1.b1 = tab2.a2;
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on tab2.a2 = tab1.b1;
  
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on tab1.b1 = tab2.a2;
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on tab2.a2 = tab1.b1;
  
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on first.b1 = tab2.a2;
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on tab2.a2 = first.b1;
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on first.b1 = tab2.a2;
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on tab2.a2 = first.b1;
  
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on tab1.b1 = second.a2;
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on second.a2 = tab1.b1;
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on tab1.b1 = second.a2;
  select a1, a2, b1, b2 from tab1 first any left join tab2 second on second.a2 = tab1.b1;
  
  select a1, a2, first.b1, second.b2 from tab1 first any left join tab2 second on b1 = a2;
  select a1, a2, tab1.b1, tab2.b2 from tab1 first any left join tab2 second on b1 = a2;
  select a1, a2, tab1.b1, tab2.b2 from tab1 first any left join tab2 second on b1 = a2;
  
  
  select 'join on complex expression';
  select a2, b2 from tab2 any left join tab3 on a2 + b2 = a3 + b3;
  select a2, b2 from tab2 any left join tab3 on a3 + tab3.b3 = a2 + b2;
  select a2, b2 from tab2 second any left join tab3 on a3 + b3 = a2 + second.b2;
  select a2, b2 from tab2 second any left join tab3 third on third.a3 + tab3.b3 = tab2.a2 + second.b2;
  select a2, b2 from tab2 second any left join tab3 third on third.a3 + tab3.b3 = tab2.a2 + second.b2;
  
  select 'duplicate column names';
  select a1, tab1_copy.a1 from tab1 any left join tab1_copy on tab1.b1 + 3 = tab1_copy.b1 + 2 FORMAT JSONEachRow;
  select a1, tab1_copy.a1 from tab1 any left join tab1_copy on tab1.b1 + 3 = tab1_copy.b1 + 2 FORMAT JSONEachRow;
  select a1, copy.a1 from tab1 any left join tab1_copy copy on tab1.b1 + 3 = tab1_copy.b1 + 2 FORMAT JSONEachRow;
  select a1, tab1_copy.a1 from tab1 any left join tab1_copy copy on tab1.b1 + 3 = tab1_copy.b1 + 2 FORMAT JSONEachRow;
  select a1, tab1_copy.a1 from tab1 any left join tab1_copy copy on tab1.b1 + 3 = tab1_copy.b1 + 2 FORMAT JSONEachRow;
  
  select 'subquery';
  select a1 from tab1 any left join (select * from tab2) on b1 = a2;
  select a1 from tab1 any left join (select a2 from tab2) on b1 = a2;
  select a1, b1 from tab1 any left join (select * from tab2) on b1 = a2;
  select a1, b1, a2, b2 from tab1 any left join (select * from tab2) on b1 = a2;
  select a1, a2 from tab1 any left join (select a2 from tab2) on b1 = a2;
  
  select 'subquery expression';
  select b1 from tab1 any left join (select * from tab2) on toInt32(a1 + 1) = a2;
  select a1, b1, a2, b2 from tab1 any left join (select * from tab2) on b1 + 1 = a2 + 1;
  select a1, b1, a2 from tab1 any left join (select * from tab2) on b1 + 1 = a2 + 1;
  
  select 'subquery column alias';
  select a1, b1, a2, b2 from tab1 any left join (select *, a2 as z from tab2) on b1 + 1 = z + 1;
  select a1, b1, a2, b2 from tab1 any left join (select *, a2 + 1 as z from tab2) on b1 + 1 = z;
  select a1, b1, a2, b2 from tab1 any left join (select *, a2 + 1 as z from tab2) on b1 + 2 = z + 1 format TSV;
  
  select 'subquery alias';
  select a1, a2, b1, b2 from tab1 first any left join (select * from tab2) second on first.b1 = second.a2;
  select a1, a2, b1, b2 from tab1 first any left join (select *, a2 as z from tab2) second on first.b1 = second.z;
  select a1, a2, b1, b2 from tab1 first any left join (select *, a2 + 1 as z from tab2) second on first.b1 + 1 = second.z;
  select tab1.a1, a2, tab1.b1, second.b2 from tab1 first any left join (select * from tab2) second on first.b1 = second.a2;
  select a1, s.a1 from tab1 any left join (select * from tab1_copy) s on tab1.b1 + 3 = s.b1 + 2 FORMAT JSONEachRow;
  
  drop table tab1;
  drop table tab1_copy;
  drop table tab2;
  drop table tab3;
  