After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit a23c2c7.

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 2025-07-10 21:49:52Z
• Commit Run on amd64-c6a-4xlarge-linux at 2025-07-10 20:23:03Z
• Commit Run on test-mac-arm at 2025-07-10 20:41:11Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-07-10 20:47:00Z

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 2025-07-10 20:23:03Z
  • 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=<CeilTemporal, zoned, round_1_week>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporal (C++) with params=<ISOWeek, zoned>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporalRounding (C++) with params=<CeilTemporal, zoned, round_10_week>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporalRounding (C++) with params=<CeilTemporal, zoned, round_10_week>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporal (C++) with params=<ISOWeek, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • ExecuteScalarExpressionOverhead (C++) with params=ref_only_expression/rows_per_batch:100000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • ExecuteScalarExpressionOverhead (C++) with params=ref_only_expression/rows_per_batch:1000000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • BenchmarkTemporal (C++) with params=<USWeek, zoned>/524288/100, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporal (C++) with params=<USWeek, zoned>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporalRounding (C++) with params=<CeilTemporal, zoned, round_1_week>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark