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@XinShuoWang XinShuoWang commented Dec 29, 2025

What problem does this PR solve?

Issue Number: close #xxx

Type of Change

  • πŸ› Bug fix (non-breaking change which fixes an issue)
  • ✨ New feature (non-breaking change which adds functionality)
  • πŸš€ Performance improvement (optimization)
  • ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
  • πŸ”¨ Refactoring (no logic changes)
  • πŸ”§ Build/CI or Infrastructure changes
  • πŸ“ Documentation only

Description

Describe your changes in detail.
For complex logic, explain the "Why" and "How".

Performance Impact

  • No Impact: This change does not affect the critical path (e.g., build system, doc, error handling).

  • Positive Impact: I have run benchmarks.

    Click to view Benchmark Results
    Paste your google-benchmark or TPC-H results here.
    Before: 10.5s
    After:   8.2s  (+20%)
    
  • Negative Impact: Explained below (e.g., trade-off for correctness).

Release Note

Please describe the changes in this PR

Release Note:

Release Note:
- Fixed a crash in `substr` when input is null.
- optimized `group by` performance by 20%.

Checklist (For Author)

  • I have added/updated unit tests (ctest).
  • I have verified the code with local build (Release/Debug).
  • I have run clang-format / linters.
  • (Optional) I have run Sanitizers (ASAN/TSAN) locally for complex C++ changes.
  • No need to test or manual test.

Breaking Changes

  • No

  • Yes (Description: ...)

    Click to view Breaking Changes
    Breaking Changes:
    - Description of the breaking change.
    - Possible solutions or workarounds.
    - Any other relevant information.
    

```
git clone -b add_bolt_backend https://github.com/WangGuangxin/gluten.git
cd gluten
make arrow
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make arrow should be run after make release, since make arrow only build arrow java and relies on the arrow source code downloaded during make release

@yangzhg yangzhg added the documentation Improvements or additions to documentation label Jan 9, 2026
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5 participants