yjhjstz opened a new pull request, #1681:
URL: https://github.com/apache/cloudberry/pull/1681
# TPC-H SF=10 Performance Change Summary
## Overall Result
**Total runtime: 274,201 ms → 245,672 ms (−10.4%, saved 28.5s)**
- 10 queries show plan changes
- 1 regression (Q03), 9 improvements
## Root Cause of Plan Changes
All plan diffs follow the same pattern: **`StreamingPartialHashAgg` →
`HashAgg`**. The baseline's two-phase streaming aggregation (partial →
redistribute → finalize) was replaced by
single-phase hash aggregation, eliminating intermediate state maintenance
before redistribution.
## Per-Query Changes
| Query | Baseline | New | Change | Key Driver |
|---|---:|---:|---:|---|
| Q17 | 60,282 ms | 30,396 ms | **−49.6%** | Spill 1,375 MB → 697 MB;
memory-wanted 47.6 GB → 3.8 GB |
| Q07 | 8,124 ms | 7,123 ms | −12.3% | Simpler agg path |
| Q08 | 7,628 ms | 7,250 ms | −4.9% | Simpler agg path |
| Q09 | 14,508 ms | 13,886 ms | −4.3% | Simpler agg path |
| Q05 | 7,756 ms | 7,448 ms | −4.0% | Simpler agg path |
| **Q03 (regression)** | **19,977 ms** | **25,561 ms** | **+28.0%** |
Spill 7 MB → 471 MB |
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
- [ ] Requested review from [cloudberry
committers](https://github.com/orgs/apache/teams/cloudberry-committers)
### Additional Context
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