zhangwenchao-123 opened a new pull request, #1868:
URL: https://github.com/apache/cloudberry/pull/1868
GPORCA previously rejected any query touching a hash-partitioned table and
fell back to the Postgres planner. Enable GPORCA to plan such queries, with
static partition pruning for equality predicates and dynamic (join-driven)
partition elimination.
How:
- CTranslatorRelcacheToDXL: stop raising "hash partitioning" for a
single-column, single-level hash partition key and let the strategy flow into
GPORCA. Composite keys, partitioning by expression and multi-level partitioning
still fall back to the planner.
- IMDRelation: add ErelpartitionHash ('h') to the partition-type enum.
- CExpressionPreprocessor: a hash leaf's qual is a
satisfies_hash_partition() call with no btree-interval form, so
PcnstrFromChildPartition now returns NULL instead of asserting. Add
FHashPartitionPruned(): substitute the query's equality constants for the
partition-key columns into that call and evaluate it with the
constant-expression evaluator; a leaf whose call folds to false cannot hold a
matching row and is pruned. This reuses PostgreSQL's exact hashing (seed,
per-column proc, combine), so selection is identical.
- CConstExprEvaluatorDXL: allow folding any column-free immutable expression
(e.g. satisfies_hash_partition over constants), not only (const cmp const).
Volatile/stable and column-referencing expressions are still rejected.
Dynamic partition elimination needs no hash-specific code: once hash tables
become CLogicalDynamicGet the existing CPhysicalPartitionSelector path is
partition-type agnostic, and CPartPruneStepsBuilder resolves the strategy from
the partition's own hash opfamily.
ORCA vs Postgres planner behavior:
- Partition selection and results are identical. For the supported
single-column, single-level hash key, an equality predicate prunes to exactly
the same surviving partition(s) as the Postgres planner and returns the same
rows row-for-row. When a single partition survives, both narrow dispatch to
that one segment (Gather Motion 1:1).
- Unchanged: composite keys, partitioning by expression and multi-level
partitioning still fall back to the Postgres planner, and range/list pruning is
unaffected.
Authored-by: Zhang Wenchao <[email protected]>
<!-- Thank you for your contribution to Apache Cloudberry (Incubating)! -->
Fixes #ISSUE_Number
### 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
- [ ] This PR contains AI-assisted code generation
- [ ] 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]
