After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 62d2dd8.

Benchmarks with performance regressions

There was 1 possible performance regression, according to the lookback z-score method.

Benchmarks with regressions:

• Commit Run on amd64-m5-4xlarge-linux at 2026-07-24 18:29:49Z
  • dataframe-to-table (R) with dataset=type_dict, language=R

All benchmark runs analyzed:

• Commit Run on amd64-c6a-4xlarge-linux at 2026-07-24 18:17:02Z
• Commit Run on test-mac-arm at 2026-07-25 14:49:54Z
• Commit Run on amd64-m5-4xlarge-linux at 2026-07-24 18:29:49Z
• Commit Run on arm64-t4g-2xlarge-linux at 2026-07-24 18:46:51Z

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 2026-07-24 18:17:02Z

  • RecordBatchSortIndicesInt64Narrow (C++) with params=1048576/100/1, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • RecordBatchSortIndicesInt64Narrow (C++) with params=1048576/4/1, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2026-07-24 18:29:49Z

  • BinaryVisitTwoBitRunsSumWithOffset (C++) with params=65536, source=cpp-micro, suite=arrow-bit-block-counter-benchmark

• Commit Run on arm64-t4g-2xlarge-linux at 2026-07-24 18:46:51Z

  • VisitSetBitRunsSumWithOffset (C++) with params=32768, source=cpp-micro, suite=arrow-bit-block-counter-benchmark
  • BinaryVisitTwoBitRunsSum (C++) with params=32768, source=cpp-micro, suite=arrow-bit-block-counter-benchmark
  • VisitBitRunsSumWithOffset (C++) with params=65536, source=cpp-micro, suite=arrow-bit-block-counter-benchmark
  • VisitBitRunsSumWithOffset (C++) with params=2, source=cpp-micro, suite=arrow-bit-block-counter-benchmark
  • BinaryVisitTwoSetBitRunsSum (C++) with params=4096, source=cpp-micro, suite=arrow-bit-block-counter-benchmark
  • VisitSetBitRunsSum (C++) with params=65536, source=cpp-micro, suite=arrow-bit-block-counter-benchmark
  • BinaryVisitTwoSetBitRunsSum (C++) with params=65536, source=cpp-micro, suite=arrow-bit-block-counter-benchmark
  • BinaryVisitTwoBitRunsSum (C++) with params=4096, source=cpp-micro, suite=arrow-bit-block-counter-benchmark
  • BinaryVisitTwoBitRunsSum (C++) with params=512, source=cpp-micro, suite=arrow-bit-block-counter-benchmark
  • VisitBitRunsSum (C++) with params=65536, source=cpp-micro, suite=arrow-bit-block-counter-benchmark