After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 6bba203.

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-linux-compute at 2024-07-30 22:04:50Z
• Commit Run on ec2-c6a-4xlarge-us-east-2 at 2024-07-30 20:41:13Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-07-30 21:58:51Z
• Commit Run on test-mac-arm at 2024-07-30 22:28:54Z

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 ec2-c6a-4xlarge-us-east-2 at 2024-07-30 20:41:13Z

  • UniqueUInt8 (C++) with params=0, source=cpp-micro, suite=arrow-compute-vector-hash-benchmark
  • BenchmarkTemporalBinary (C++) with params=<DaysBetween, zoned>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporalBinary (C++) with params=<HoursBetween, zoned>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • UniqueUInt8 (C++) with params=1, source=cpp-micro, suite=arrow-compute-vector-hash-benchmark
  • BenchmarkTemporalBinary (C++) with params=<MinutesBetween, zoned>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporalBinary (C++) with params=<SecondsBetween, zoned>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporalBinary (C++) with params=<MicrosecondsBetween, zoned>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • BenchmarkTemporalBinary (C++) with params=<MillisecondsBetween, zoned>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark

• Commit Run on test-mac-arm at 2024-07-30 22:28:54Z

  • TableSortIndicesInt64Narrow (C++) with params=1048576/0/16/4, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • TakeChunkedChunkedFSBRandomIndicesWithNulls (C++) with params=4194304/1000/9, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • TableSortIndicesInt64Narrow (C++) with params=1048576/100/16/1, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • RecordBatchSortIndicesInt64Narrow (C++) with params=1048576/100/8, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • TakeStringRandomIndicesNoNulls (C++) with params=4194304/0, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • CastDoubleToInt32Safe (C++) with params=4194304/1000, source=cpp-micro, suite=arrow-compute-scalar-cast-benchmark
  • CastUInt32ToInt32Safe (C++) with params=4194304/1, source=cpp-micro, suite=arrow-compute-scalar-cast-benchmark
  • FilterStringFilterNoNulls (C++) with params=4194304/0, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • BM_DeltaLengthEncodingByteArray (C++) with params=max-string-length:1024/batch-size:512, source=cpp-micro, suite=parquet-encoding-benchmark