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Diffstat (limited to 'src/test/regress/sql/join.sql')
| -rw-r--r-- | src/test/regress/sql/join.sql | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/regress/sql/join.sql b/src/test/regress/sql/join.sql index 7157b5cccc..9d20b88d71 100644 --- a/src/test/regress/sql/join.sql +++ b/src/test/regress/sql/join.sql @@ -1770,6 +1770,21 @@ select id from a where id in ( select b.id from b left join c on b.id = c.id ); +-- check optimization with oddly-nested outer joins +explain (costs off) +select a1.id from + (a a1 left join a a2 on true) + left join + (a a3 left join a a4 on a3.id = a4.id) + on a2.id = a3.id; + +explain (costs off) +select a1.id from + (a a1 left join a a2 on a1.id = a2.id) + left join + (a a3 left join a a4 on a3.id = a4.id) + on a2.id = a3.id; + -- check that join removal works for a left join when joining a subquery -- that is guaranteed to be unique by its GROUP BY clause explain (costs off) |