After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 8b23360.

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 10:11:41Z
• Commit Run on amd64-c6a-4xlarge-linux at 2025-07-10 09:53:55Z
• Commit Run on test-mac-arm at 2025-07-10 10:11:03Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-07-10 10:10:43Z

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 arm64-t4g-2xlarge-linux at 2025-07-10 10:11:41Z

  • BM_ReadInt64Column (C++) with params=<Repetition::REQUIRED, Compression::LZ4>/65536/1024, source=cpp-micro, suite=parquet-column-io-benchmark
  • ErrorSchemeResultNoInline (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=1048576/0, source=cpp-micro, suite=arrow-int-util-benchmark
  • CheckIndexBoundsInt32 (C++) with params=1048576/1, source=cpp-micro, suite=arrow-int-util-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=65536/0, source=cpp-micro, suite=arrow-int-util-benchmark
  • ArrayScalarKernel (C++) with params=<DivideChecked, Int64Type>/size:1048576/inverse_null_proportion:100, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=65536/1000, source=cpp-micro, suite=arrow-int-util-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=1048576/1000, source=cpp-micro, suite=arrow-int-util-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=65536/1, source=cpp-micro, suite=arrow-int-util-benchmark
  • CheckIndexBoundsInt32 (C++) with params=65536/2, source=cpp-micro, suite=arrow-int-util-benchmark
  • CheckIndexBoundsInt32 (C++) with params=65536/1, source=cpp-micro, suite=arrow-int-util-benchmark

• Commit Run on amd64-c6a-4xlarge-linux at 2025-07-10 09:53:55Z

  • BuildIntArrayNoNulls (C++) with source=cpp-micro, suite=arrow-builder-benchmark
  • ProjectionOverheadIsolated (C++) with params=simple_expression/batch_size:100000/real_time, source=cpp-micro, suite=arrow-acero-project-benchmark