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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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3
src/backend/parser/analyze.c
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@@ -1890,7 +1890,8 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
* For now, we don't support resjunk sort clauses on the output of a
* setOperation tree --- you can only use the SQL92-spec options of
* selecting an output column by name or number. Enforce by checking that
* transformSortClause doesn't add any items to tlist.
* transformSortClause doesn't add any items to tlist. Note, if changing
* this, add_setop_child_rel_equivalences() will need to be updated.
*/
tllen = list_length(qry->targetList);