test, per Dave Page and buildfarm. Perhaps we will need a join_2 instead,
but for the moment assume that this test tracks the other diffs.
select tt1.*, tt2.* from tt1 left join tt2 on tt1.joincol = tt2.joincol;
tt1_id | joincol | tt2_id | joincol
--------+---------+--------+---------
- 1 | 11 | 21 | 11
1 | 11 | 22 | 11
+ 1 | 11 | 21 | 11
2 | | |
(3 rows)
select tt1.*, tt2.* from tt2 right join tt1 on tt1.joincol = tt2.joincol;
tt1_id | joincol | tt2_id | joincol
--------+---------+--------+---------
- 1 | 11 | 21 | 11
1 | 11 | 22 | 11
+ 1 | 11 | 21 | 11
2 | | |
(3 rows)