diff options
Diffstat (limited to 'src/test/regress/sql/tsrf.sql')
| -rw-r--r-- | src/test/regress/sql/tsrf.sql | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/test/regress/sql/tsrf.sql b/src/test/regress/sql/tsrf.sql index 0a1e8e56660..7c22529a0db 100644 --- a/src/test/regress/sql/tsrf.sql +++ b/src/test/regress/sql/tsrf.sql @@ -28,6 +28,18 @@ SELECT generate_series(1, generate_series(1, 3)), generate_series(2, 4); CREATE TABLE few(id int, dataa text, datab text); INSERT INTO few VALUES(1, 'a', 'foo'),(2, 'a', 'bar'),(3, 'b', 'bar'); +-- SRF with a provably-dummy relation +explain (verbose, costs off) +SELECT unnest(ARRAY[1, 2]) FROM few WHERE false; +SELECT unnest(ARRAY[1, 2]) FROM few WHERE false; + +-- SRF shouldn't prevent upper query from recognizing lower as dummy +explain (verbose, costs off) +SELECT * FROM few f1, + (SELECT unnest(ARRAY[1,2]) FROM few f2 WHERE false OFFSET 0) ss; +SELECT * FROM few f1, + (SELECT unnest(ARRAY[1,2]) FROM few f2 WHERE false OFFSET 0) ss; + -- SRF output order of sorting is maintained, if SRF is not referenced SELECT few.id, generate_series(1,3) g FROM few ORDER BY id DESC; |