After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit c48e81e.

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 2026-03-03 16:33:28Z
• Commit Run on amd64-c6a-4xlarge-linux at 2026-03-03 14:52:08Z
• Commit Run on amd64-m5-4xlarge-linux at 2026-03-03 17:26:45Z

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 2026-03-03 14:52:08Z

  • ExecuteScalarExpressionOverhead (C++) with params=ref_only_expression/rows_per_batch:10000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • BenchmarkTemporalRounding (C++) with params=<RoundTemporal, non_zoned, round_10_month>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • ExecuteScalarExpressionOverhead (C++) with params=ref_only_expression/rows_per_batch:1000000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • BenchmarkTemporalRounding (C++) with params=<CeilTemporal, non_zoned, round_1_month>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporalRounding (C++) with params=<CeilTemporal, non_zoned, round_1_month>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2026-03-03 17:26:45Z

  • TypeEqualsSimple (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • BM_UnpackUint64 (C++) with params=Avx512Unaligned/1/32, source=cpp-micro, suite=arrow-bpacking-benchmark