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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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5
src/backend/optimizer/path/allpaths.c
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@@ -2633,9 +2633,8 @@ set_subquery_pathlist(PlannerInfo *root, RelOptInfo *rel,
Assert(root->plan_params == NIL);
/* Generate a subroot and Paths for the subquery */
rel->subroot = subquery_planner(root->glob, subquery,
root,
false, tuple_fraction);
rel->subroot = subquery_planner(root->glob, subquery, root, false,
tuple_fraction, NULL);
/* Isolate the params needed by this specific subplan */
rel->subplan_params = root->plan_params;