After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit f65ee2c.

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 2025-12-21 11:38:00Z
• Commit Run on amd64-c6a-4xlarge-linux at 2025-12-18 18:01:18Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-12-21 08:00:31Z

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 2025-12-21 11:38:00Z

  • AllocateDeallocate (C++) with params=/size:1048576/real_time/threads:1, source=cpp-micro, suite=arrow-memory-pool-benchmark

• Commit Run on amd64-c6a-4xlarge-linux at 2025-12-18 18:01:18Z

  • ArrayArrayKernel (C++) with params=<MultiplyChecked, UInt8Type>/size:524288/inverse_null_proportion:100, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark