After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit a942ed6.

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 2026-03-24 13:53:13Z
• Commit Run on amd64-m5-4xlarge-linux at 2026-03-24 15:50:29Z
• Commit Run on arm64-t4g-2xlarge-linux at 2026-03-24 16:31:25Z

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 2026-03-24 13:53:13Z
  • BM_UnpackUint64 (C++) with params=DynamicUnaligned/8/128, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicUnaligned/8/512, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicAligned/8/512, 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=DynamicAligned/8/32, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=Avx2Unaligned/8/128, source=cpp-micro, suite=arrow-bpacking-benchmark
  • ArrayRangeEqualsFloat32 (C++) with params=32768/2, source=cpp-micro, suite=arrow-compare-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicUnaligned/8/256, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicUnaligned/8/32, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=Avx2Unaligned/8/32, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint32 (C++) with params=Avx2Unaligned/8/32, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicAligned/8/256, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=Avx2Unaligned/8/256, source=cpp-micro, suite=arrow-bpacking-benchmark