After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 046e7cb.

Benchmarks with performance regressions

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

All benchmark runs analyzed:

• Commit Run on test-mac-arm at 2024-09-12 08:07:44Z
• Commit Run on arm64-t4g-2xlarge-linux at 2024-09-12 08:00:32Z
• Commit Run on amd64-c6a-4xlarge-linux at 2024-09-12 07:40:03Z
• Commit Run on amd64-m5-4xlarge-linux at 2024-09-12 07:52:04Z

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 arm64-t4g-2xlarge-linux at 2024-09-12 08:00:32Z
  • ExecuteScalarExpressionOverhead (C++) with params=complex_expression/rows_per_batch:1000000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark