After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit 2fcc3ec.

Benchmarks with performance regressions

There were 0 possible performance regressions, according to the lookback z-score method.

All benchmark runs analyzed:

• Commit Run on amd64-c6a-4xlarge-linux at 2026-02-24 20:05:54Z
• Commit Run on arm64-t4g-2xlarge-linux at 2026-02-24 22:59:50Z
• Commit Run on amd64-m5-4xlarge-linux at 2026-02-24 22:23:44Z

Unstable benchmarks with performance regressions

The following benchmark results indicate a possible performance regression, but are known to sometimes produce false positives when applying the lookback z-score analysis.

• Commit Run on amd64-c6a-4xlarge-linux at 2026-02-24 20:05:54Z

  • ShortVectorPushBack (C++) with params=<SMALL_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • BM_UnpackUint32 (C++) with params=DynamicUnaligned/20/64, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint32 (C++) with params=Avx2Unaligned/20/64, source=cpp-micro, suite=arrow-bpacking-benchmark
  • ShortVectorPushBack (C++) with params=<STATIC_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • UniqueInt64 (C++) with params=2, source=cpp-micro, suite=arrow-compute-vector-hash-benchmark
  • ArrayDataConstructDestruct (C++) with source=cpp-micro, suite=arrow-builder-benchmark
  • BM_UnpackUint32 (C++) with params=DynamicAligned/20/64, source=cpp-micro, suite=arrow-bpacking-benchmark

• Commit Run on arm64-t4g-2xlarge-linux at 2026-02-24 22:59:50Z

  • Constants (C++) with source=cpp-micro, suite=arrow-decimal-benchmark
  • BinaryMathOpAdd256 (C++) with source=cpp-micro, suite=arrow-decimal-benchmark