After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 603901a.

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 2025-10-23 12:22:36Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-10-23 14:10:01Z
• Commit Run on test-mac-arm at 2025-10-23 12:48:03Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-10-23 14:09:49Z

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 2025-10-23 12:22:36Z

  • BenchmarkTemporal (C++) with params=<Year, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporal (C++) with params=<DayOfYear, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporal (C++) with params=<Quarter, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporal (C++) with params=<Month, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporal (C++) with params=<Day, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporal (C++) with params=<Minute, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporal (C++) with params=<IsLeapYear, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • UniqueUInt8 (C++) with params=0, source=cpp-micro, suite=arrow-compute-vector-hash-benchmark
  • BenchmarkTemporal (C++) with params=<Hour, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark

• Commit Run on test-mac-arm at 2025-10-23 12:48:03Z

  • BM_HashJoinBasic_ProbeParallelism (C++) with params=Threads:14/HashTable krows:8/process_time, source=cpp-micro, suite=arrow-acero-hash-join-benchmark