database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-07 19:06:32 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

3
src/backend/parser/analyze.c
View File

@@ -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);