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Re-allow planner to use Merge Append to efficiently implement UNION.

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This reverts commit 7204f35919,
thus restoring 66c0185a3 (Allow planner to use Merge Append to
efficiently implement UNION) as well as the follow-on commits
d5d2205c8, 3b1a7eb28, 7487044d6.

Per further discussion on pgsql-release, we wish to ship beta1 with
this feature, and patch the bug that was found just before wrap,
rather than shipping beta1 with the feature reverted.
This commit is contained in:
Robert Haas
2024-05-21 12:42:27 -04:00
parent 3bd7b2f465
commit 12933dc604
18 changed files with 761 additions and 287 deletions
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9
contrib/postgres_fdw/sql/postgres_fdw.sql
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@ -3885,6 +3885,11 @@ DROP INDEX base_tbl2_idx;
DROP INDEX async_p3_idx;
-- UNION queries
SET enable_sort TO off;
SET enable_incremental_sort TO off;
-- Adjust fdw_startup_cost so that we get an unordered path in the Append.
ALTER SERVER loopback2 OPTIONS (ADD fdw_startup_cost '0.00');
EXPLAIN (VERBOSE, COSTS OFF)
INSERT INTO result_tbl
(SELECT a, b, 'AAA' || c FROM async_p1 ORDER BY a LIMIT 10)
@ -3911,6 +3916,10 @@ UNION ALL
SELECT * FROM result_tbl ORDER BY a;
DELETE FROM result_tbl;
RESET enable_incremental_sort;
RESET enable_sort;
ALTER SERVER loopback2 OPTIONS (DROP fdw_startup_cost);
-- Disable async execution if we use gating Result nodes for pseudoconstant
-- quals
EXPLAIN (VERBOSE, COSTS OFF)