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| author | Thomas Munro <tmunro@postgresql.org> | 2019-06-18 22:38:30 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2019-06-19 01:25:57 +1200 |
| commit | aca127c105aae551620d607e88d76930e6b9a2cf (patch) | |
| tree | 0bfa491870fa91d9c93396589af251c4e3f27623 /doc/src | |
| parent | 0ab7110bcbcce5ff58afb32e7871c54e87502139 (diff) | |
| download | postgresql-aca127c105aae551620d607e88d76930e6b9a2cf.tar.gz postgresql-aca127c105aae551620d607e88d76930e6b9a2cf.zip | |
Prevent Parallel Hash Join for JOIN_UNIQUE_INNER.
WHERE EXISTS (...) queries cannot be executed by Parallel Hash Join
with jointype JOIN_UNIQUE_INNER, because there is no way to make a
partial plan totally unique. The consequence of allowing such plans
was duplicate results from some EXISTS queries.
Back-patch to 11. Bug #15857.
Author: Thomas Munro
Reviewed-by: Tom Lane
Reported-by: Vladimir Kriukov
Discussion: https://postgr.es/m/15857-d1ba2a64bce0795e%40postgresql.org
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