After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit 5de6aa6.

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-m5-4xlarge-linux at 2025-12-23 12:56:24Z
• Commit Run on amd64-c6a-4xlarge-linux at 2025-12-19 13:32:27Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-12-24 05:10:51Z

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 2025-12-19 13:32:27Z

  • ArrayRangeEqualsFloat32 (C++) with params=32768/0, source=cpp-micro, suite=arrow-compare-benchmark
  • TouchArea (C++) with params=size:1048576/real_time/threads:2, source=cpp-micro, suite=arrow-memory-pool-benchmark
  • ResolveManyUInt32Sorted (C++) with params=chunked_array_length:65535/num_chunks:10000/num_indices:508, source=cpp-micro, suite=arrow-chunk-resolver-benchmark
  • BenchmarkTemporalBinary (C++) with params=<HoursBetween, zoned>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • AllocateTouchDeallocate (C++) with params=/size:16777216/real_time/threads:1, source=cpp-micro, suite=arrow-memory-pool-benchmark
  • TouchArea (C++) with params=size:16777216/real_time/threads:1, source=cpp-micro, suite=arrow-memory-pool-benchmark
  • ArrayRangeEqualsInt32 (C++) with params=32768/100, source=cpp-micro, suite=arrow-compare-benchmark
  • TouchArea (C++) with params=size:65536/real_time/threads:2, source=cpp-micro, suite=arrow-memory-pool-benchmark
  • TouchArea (C++) with params=size:1048576/real_time/threads:1, source=cpp-micro, suite=arrow-memory-pool-benchmark
  • ResolveManyUInt32Random (C++) with params=chunked_array_length:65535/num_chunks:10000/num_indices:32764, source=cpp-micro, suite=arrow-chunk-resolver-benchmark
  • ArrayRangeEqualsFloat32 (C++) with params=32768/100, source=cpp-micro, suite=arrow-compare-benchmark
  • BuildInt64DictionaryArraySimilar (C++) with source=cpp-micro, suite=arrow-builder-benchmark
  • MemoryBandwidth (C++) with params=/33554432/real_time/threads:2, source=cpp-micro, suite=arrow-io-memory-benchmark
  • ArrayRangeEqualsFloat32 (C++) with params=32768/10000, source=cpp-micro, suite=arrow-compare-benchmark
  • ArrayRangeEqualsFloat32 (C++) with params=32768/10, source=cpp-micro, suite=arrow-compare-benchmark
  • MemoryBandwidth (C++) with params=/size:262144, source=cpp-micro, suite=arrow-io-memory-benchmark
  • ResolveManyUInt16Sorted (C++) with params=chunked_array_length:65535/num_chunks:100/num_indices:32764, source=cpp-micro, suite=arrow-chunk-resolver-benchmark
  • ResolveManyUInt16Random (C++) with params=chunked_array_length:65535/num_chunks:10000/num_indices:32764, source=cpp-micro, suite=arrow-chunk-resolver-benchmark
  • TouchArea (C++) with params=size:65536/real_time/threads:1, source=cpp-micro, suite=arrow-memory-pool-benchmark

• Commit Run on arm64-t4g-2xlarge-linux at 2025-12-24 05:10:51Z

  • ExecuteScalarExpressionOverhead (C++) with params=complex_expression/rows_per_batch:1000000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark