After merging your PR, Conbench analyzed the 2 benchmarking runs that have been run so far on merge-commit 48a2e88.

Benchmarks with performance regressions

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

All benchmark runs analyzed:

• Commit Run on arm64-t4g-2xlarge-linux at 2025-10-06 21:40:14Z
• Commit Run on test-mac-arm at 2025-10-06 22:01:56Z

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 test-mac-arm at 2025-10-06 22:01:56Z
  • BM_HashJoinBasic_ProbeParallelism (C++) with params=Threads:13/HashTable krows:8/process_time, source=cpp-micro, suite=arrow-acero-hash-join-benchmark
  • BM_HashJoinBasic_ProbeParallelism (C++) with params=Threads:14/HashTable krows:8/process_time, source=cpp-micro, suite=arrow-acero-hash-join-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicAligned/8/1024, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicAligned/2/32768, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicAligned/47/64, source=cpp-micro, suite=arrow-bpacking-benchmark
  • BM_HashJoinBasic_ProbeParallelism (C++) with params=Threads:12/HashTable krows:8/process_time, source=cpp-micro, suite=arrow-acero-hash-join-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicAligned/47/1024, source=cpp-micro, suite=arrow-bpacking-benchmark