diff options
Diffstat (limited to 'src/test')
| -rw-r--r-- | src/test/regress/expected/union.out | 115 | ||||
| -rw-r--r-- | src/test/regress/sql/union.sql | 43 |
2 files changed, 158 insertions, 0 deletions
diff --git a/src/test/regress/expected/union.out b/src/test/regress/expected/union.out index ee26b163f7..92d427a690 100644 --- a/src/test/regress/expected/union.out +++ b/src/test/regress/expected/union.out @@ -553,6 +553,121 @@ SELECT q1 FROM int8_tbl EXCEPT (((SELECT q2 FROM int8_tbl ORDER BY q2 LIMIT 1))) (5 rows) -- +-- Check behavior with empty select list (allowed since 9.4) +-- +select union select; +-- +(1 row) + +select intersect select; +-- +(1 row) + +select except select; +-- +(0 rows) + +-- check hashed implementation +set enable_hashagg = true; +set enable_sort = false; +explain (costs off) +select from generate_series(1,5) union select from generate_series(1,3); + QUERY PLAN +---------------------------------------------------------------- + HashAggregate + -> Append + -> Function Scan on generate_series + -> Function Scan on generate_series generate_series_1 +(4 rows) + +explain (costs off) +select from generate_series(1,5) intersect select from generate_series(1,3); + QUERY PLAN +---------------------------------------------------------------------- + HashSetOp Intersect + -> Append + -> Subquery Scan on "*SELECT* 1" + -> Function Scan on generate_series + -> Subquery Scan on "*SELECT* 2" + -> Function Scan on generate_series generate_series_1 +(6 rows) + +select from generate_series(1,5) union select from generate_series(1,3); +-- +(1 row) + +select from generate_series(1,5) union all select from generate_series(1,3); +-- +(8 rows) + +select from generate_series(1,5) intersect select from generate_series(1,3); +-- +(1 row) + +select from generate_series(1,5) intersect all select from generate_series(1,3); +-- +(3 rows) + +select from generate_series(1,5) except select from generate_series(1,3); +-- +(0 rows) + +select from generate_series(1,5) except all select from generate_series(1,3); +-- +(2 rows) + +-- check sorted implementation +set enable_hashagg = false; +set enable_sort = true; +explain (costs off) +select from generate_series(1,5) union select from generate_series(1,3); + QUERY PLAN +---------------------------------------------------------------- + Unique + -> Append + -> Function Scan on generate_series + -> Function Scan on generate_series generate_series_1 +(4 rows) + +explain (costs off) +select from generate_series(1,5) intersect select from generate_series(1,3); + QUERY PLAN +---------------------------------------------------------------------- + SetOp Intersect + -> Append + -> Subquery Scan on "*SELECT* 1" + -> Function Scan on generate_series + -> Subquery Scan on "*SELECT* 2" + -> Function Scan on generate_series generate_series_1 +(6 rows) + +select from generate_series(1,5) union select from generate_series(1,3); +-- +(1 row) + +select from generate_series(1,5) union all select from generate_series(1,3); +-- +(8 rows) + +select from generate_series(1,5) intersect select from generate_series(1,3); +-- +(1 row) + +select from generate_series(1,5) intersect all select from generate_series(1,3); +-- +(3 rows) + +select from generate_series(1,5) except select from generate_series(1,3); +-- +(0 rows) + +select from generate_series(1,5) except all select from generate_series(1,3); +-- +(2 rows) + +reset enable_hashagg; +reset enable_sort; +-- -- Check handling of a case with unknown constants. We don't guarantee -- an undecorated constant will work in all cases, but historically this -- usage has worked, so test we don't break it. diff --git a/src/test/regress/sql/union.sql b/src/test/regress/sql/union.sql index c0317cccb4..eed7c8d34b 100644 --- a/src/test/regress/sql/union.sql +++ b/src/test/regress/sql/union.sql @@ -191,6 +191,49 @@ SELECT q1 FROM int8_tbl EXCEPT (((SELECT q2 FROM int8_tbl ORDER BY q2 LIMIT 1))) (((((select * from int8_tbl))))); -- +-- Check behavior with empty select list (allowed since 9.4) +-- + +select union select; +select intersect select; +select except select; + +-- check hashed implementation +set enable_hashagg = true; +set enable_sort = false; + +explain (costs off) +select from generate_series(1,5) union select from generate_series(1,3); +explain (costs off) +select from generate_series(1,5) intersect select from generate_series(1,3); + +select from generate_series(1,5) union select from generate_series(1,3); +select from generate_series(1,5) union all select from generate_series(1,3); +select from generate_series(1,5) intersect select from generate_series(1,3); +select from generate_series(1,5) intersect all select from generate_series(1,3); +select from generate_series(1,5) except select from generate_series(1,3); +select from generate_series(1,5) except all select from generate_series(1,3); + +-- check sorted implementation +set enable_hashagg = false; +set enable_sort = true; + +explain (costs off) +select from generate_series(1,5) union select from generate_series(1,3); +explain (costs off) +select from generate_series(1,5) intersect select from generate_series(1,3); + +select from generate_series(1,5) union select from generate_series(1,3); +select from generate_series(1,5) union all select from generate_series(1,3); +select from generate_series(1,5) intersect select from generate_series(1,3); +select from generate_series(1,5) intersect all select from generate_series(1,3); +select from generate_series(1,5) except select from generate_series(1,3); +select from generate_series(1,5) except all select from generate_series(1,3); + +reset enable_hashagg; +reset enable_sort; + +-- -- Check handling of a case with unknown constants. We don't guarantee -- an undecorated constant will work in all cases, but historically this -- usage has worked, so test we don't break it. |