After merging your PR, Conbench analyzed the 2 benchmarking runs that have been run so far on merge-commit e137a04.

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 2025-10-07 10:59:44Z
• Commit Run on test-mac-arm at 2025-10-07 12:03:43Z

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 2025-10-07 12:03:43Z
  • FilterOverhead (C++) with params=not_null_and_is_true_singlepass_benchmark/batch_size:1000/null_prob:0/bool_true_prob:25/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • FilterOverhead (C++) with params=not_null_and_is_true_singlepass_benchmark/batch_size:1000/null_prob:75/bool_true_prob:100/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • FilterOverhead (C++) with params=not_null_to_is_true_multipass_benchmark/batch_size:1000/null_prob:50/bool_true_prob:50/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • FilterOverhead (C++) with params=not_null_and_is_true_singlepass_benchmark/batch_size:1000/null_prob:50/bool_true_prob:50/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • ProjectionOverheadIsolated (C++) with params=complex_expression/batch_size:1000000/real_time, source=cpp-micro, suite=arrow-acero-project-benchmark