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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2022-07-30 13:05:15 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2022-07-30 13:05:15 -0400 |
| commit | a3699c599ced03ace09646b74b8299d8f570ca76 (patch) | |
| tree | 0215a2d31a3c430d51fb6e086f5999092bbcd601 /src/backend/utils/adt/arrayfuncs.c | |
| parent | d92f2bc0dae35747387f006519a74d3058a6bcb8 (diff) | |
| download | postgresql-a3699c599ced03ace09646b74b8299d8f570ca76.tar.gz postgresql-a3699c599ced03ace09646b74b8299d8f570ca76.zip | |
Fix incorrect is-this-the-topmost-join tests in parallel planning.
Two callers of generate_useful_gather_paths were testing the wrong
thing when deciding whether to call that function: they checked for
being at the top of the current join subproblem, rather than being at
the actual top join. This'd result in failing to construct parallel
paths for a sub-join for which they might be useful.
While set_rel_pathlist() isn't actively broken, it seems best to
make its identical-in-intention test for this be like the other two.
This has been wrong all along, but given the lack of field complaints
I'm hesitant to back-patch into stable branches; we usually prefer
to avoid non-bug-fix changes in plan choices in minor releases.
It seems not too late for v15 though.
Richard Guo, reviewed by Antonin Houska and Tom Lane
Discussion: https://postgr.es/m/CAMbWs4-mH8Zf87-w+3P2J=nJB+5OyicO28ia9q_9o=Lamf_VHg@mail.gmail.com
Diffstat (limited to 'src/backend/utils/adt/arrayfuncs.c')
0 files changed, 0 insertions, 0 deletions