yjhjstz opened a new pull request, #1620: URL: https://github.com/apache/cloudberry/pull/1620
Fixes #1618 **Root Cause** use-after-free (clauses.c): pfree(havingQual) freed the v.c Var node unconditionally. The freed memory was reused by palloc for a T_List (nodeTag=596). When copyObjectImpl later read havingQual, it copied the wrong node type, causing ORCA to encounter an unexpected RangeTblEntry and fall back to the Postgres planner — which masked the second bug. ORCA decorrelation (CSubqueryHandler.cpp): After fixing the use-after-free, ORCA no longer fell back and attempted to decorrelate the subquery. It converted GROUP BY () HAVING <outer_ref> into Left Outer Join + COALESCE(count(*), 0), incorrectly returning 0 instead of NULL when the HAVING condition was false. ### What does this PR do? <!-- Brief overview of the changes, including any major features or fixes --> ### Type of Change - [ ] Bug fix (non-breaking change) - [ ] New feature (non-breaking change) - [ ] Breaking change (fix or feature with breaking changes) - [ ] Documentation update ### Breaking Changes <!-- Remove if not applicable. If yes, explain impact and migration path --> ### Test Plan <!-- How did you test these changes? --> - [ ] Unit tests added/updated - [ ] Integration tests added/updated - [ ] Passed `make installcheck` - [ ] Passed `make -C src/test installcheck-cbdb-parallel` ### Impact <!-- Remove sections that don't apply --> **Performance:** <!-- Any performance implications? --> **User-facing changes:** <!-- Any changes visible to users? --> **Dependencies:** <!-- New dependencies or version changes? --> ### Checklist - [ ] Followed [contribution guide](https://cloudberry.apache.org/contribute/code) - [ ] Added/updated documentation - [ ] Reviewed code for security implications - [ ] Requested review from [cloudberry committers](https://github.com/orgs/apache/teams/cloudberry-committers) ### Additional Context <!-- Any other information that would help reviewers? Remove if none --> ### CI Skip Instructions <!-- To skip CI builds, add the appropriate CI skip identifier to your PR title. The identifier must: - Be in square brackets [] - Include the word "ci" and either "skip" or "no" - Only use for documentation-only changes or when absolutely necessary --> --- <!-- Join our community: - Mailing list: [[email protected]](https://lists.apache.org/[email protected]) (subscribe: [email protected]) - Discussions: https://github.com/apache/cloudberry/discussions --> -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
