After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit aa30af3.

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 2026-03-28 09:35:38Z
• Commit Run on arm64-t4g-2xlarge-linux at 2026-03-28 10:21:18Z
• Commit Run on amd64-m5-4xlarge-linux at 2026-03-28 10:15:45Z

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 2026-03-28 09:35:38Z

  • CopyShortVector (C++) with params=<STATIC_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2026-03-28 10:15:45Z

  • BM_UnpackUint64 (C++) with params=Avx2Unaligned/8/128, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=Avx512Unaligned/20/128, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicUnaligned/8/128, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicUnaligned/20/128, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicAligned/8/128, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=Avx512Unaligned/8/128, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicAligned/20/128, source=cpp-micro, suite=arrow-bpacking-benchmark