After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit 8fcab2f.

Benchmarks with performance regressions

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

All benchmark runs analyzed:

• Commit Run on amd64-c6a-4xlarge-linux at 2025-12-16 06:59:20Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-12-16 05:21:04Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-12-16 03:46:08Z

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 2025-12-16 06:59:20Z

  • BenchmarkTemporalRounding (C++) with params=<FloorTemporal, non_zoned, round_1_week>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark

• Commit Run on arm64-t4g-2xlarge-linux at 2025-12-16 05:21:04Z

  • BM_BatchComputeHash (C++) with params=, source=cpp-micro, suite=parquet-bloom-filter-benchmark
  • ArrayScalarKernel (C++) with params=<DivideChecked, Int32Type>/size:1048576/inverse_null_proportion:100, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • BM_BatchComputeHash (C++) with params=, source=cpp-micro, suite=parquet-bloom-filter-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2025-12-16 03:46:08Z

  • BenchmarkBitmapVisitBitsetAnd (C++) with params=131072/1, source=cpp-micro, suite=arrow-bit-util-benchmark
  • ListSliceInt64ListView (C++) with params=32768/1, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark
  • BM_ExecSpanIterator (C++) with params=4096, source=cpp-micro, suite=arrow-compute-function-benchmark
  • BM_ExecSpanIterator (C++) with params=65536, source=cpp-micro, suite=arrow-compute-function-benchmark
  • BM_ExecSpanIterator (C++) with params=16384, source=cpp-micro, suite=arrow-compute-function-benchmark
  • GrouperWithMultiTypes (C++) with params="{utf8}"/4096/1, source=cpp-micro, suite=arrow-compute-grouper-benchmark
  • ListSliceInt64ListViewWithStepAndStop (C++) with params=32768/1, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark