After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 673823b.

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 2025-07-10 01:18:58Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-10 01:38:14Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-07-10 01:37:47Z
• Commit Run on test-mac-arm at 2025-07-10 01:47:55Z

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 2025-07-10 01:18:58Z

  • BM_RleEncoding (C++) with params=32768/1, source=cpp-micro, suite=parquet-column-io-benchmark
  • BM_RleEncoding (C++) with params=1024/1, source=cpp-micro, suite=parquet-column-io-benchmark
  • CheckIndexBoundsInt32 (C++) with params=524288/2, source=cpp-micro, suite=arrow-int-util-benchmark
  • BM_RleEncoding (C++) with params=65536/1, source=cpp-micro, suite=parquet-column-io-benchmark
  • BM_RleEncoding (C++) with params=4096/1, source=cpp-micro, suite=parquet-column-io-benchmark
  • BM_FindExistingHash (C++) with source=cpp-micro, suite=parquet-bloom-filter-benchmark

• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-10 01:38:14Z

  • TimestampConversionDefault (C++) with source=cpp-micro, suite=arrow-csv-converter-benchmark
  • BM_HashJoinBasic_KeyTypes (C++) with params="{int32}"/Hashtable krows:1, source=cpp-micro, suite=arrow-acero-hash-join-benchmark
  • BM_WriteColumn (C++) with params=<true,BooleanType>, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2025-07-10 01:37:47Z

  • ArrayRangeEqualsStruct (C++) with params=32768/0, source=cpp-micro, suite=arrow-compare-benchmark
  • BatchToTensorSimple (C++) with params=/size:32768/num_columns:3, source=cpp-micro, suite=arrow-tensor-benchmark
  • Int8StridedTensorConversionFixture (C++) with params=/ConvertToSparseCOOTensorInt32, source=cpp-micro, suite=arrow-tensor-conversion-benchmark
  • BatchToTensorSimple (C++) with params=/size:1048576/num_columns:3, source=cpp-micro, suite=arrow-tensor-benchmark
  • Int8ColumnMajorTensorConversionFixture (C++) with params=/ConvertToSparseCOOTensorInt32, source=cpp-micro, suite=arrow-tensor-conversion-benchmark
  • BM_RleDecoding (C++) with params=4096/1, source=cpp-micro, suite=parquet-column-io-benchmark
  • BM_DeltaDecodingByteArray (C++) with params=max-string-length:64/batch-size:2048/prefixed-percent:90, source=cpp-micro, suite=parquet-encoding-benchmark
  • DoubleRowMajorTensorConversionFixture (C++) with params=/ConvertToSparseCOOTensorInt64, source=cpp-micro, suite=arrow-tensor-conversion-benchmark
  • SchemaEquals (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • ArrayRangeEqualsString (C++) with params=32768/0, source=cpp-micro, suite=arrow-compare-benchmark
  • BM_ReadColumnIndex (C++) with params=/num_pages:8, source=cpp-micro, suite=parquet-page-index-benchmark
  • Int8StridedTensorConversionFixture (C++) with params=/ConvertToSparseCOOTensorInt64, source=cpp-micro, suite=arrow-tensor-conversion-benchmark
  • Int8ColumnMajorTensorConversionFixture (C++) with params=/ConvertToSparseCOOTensorInt64, source=cpp-micro, suite=arrow-tensor-conversion-benchmark
  • Int8RowMajorTensorConversionFixture (C++) with params=/ConvertToSparseCOOTensorInt32, source=cpp-micro, suite=arrow-tensor-conversion-benchmark
  • BM_DeltaDecodingByteArray (C++) with params=max-string-length:8/batch-size:2048/prefixed-percent:99, source=cpp-micro, suite=parquet-encoding-benchmark
  • ArrayRangeEqualsInt32 (C++) with params=32768/2, source=cpp-micro, suite=arrow-compare-benchmark
  • TypeEqualsWithMetadata (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • Int8RowMajorTensorConversionFixture (C++) with params=/ConvertToSparseCOOTensorInt64, source=cpp-micro, suite=arrow-tensor-conversion-benchmark
  • DoubleColumnMajorTensorConversionFixture (C++) with params=/ConvertToSparseCOOTensorInt64, source=cpp-micro, suite=arrow-tensor-conversion-benchmark
  • BitmapEqualsWithoutOffset (C++) with params=8192, source=cpp-micro, suite=arrow-bit-util-benchmark
  • ArrayRangeEqualsFixedSizeBinary (C++) with params=32768/2, source=cpp-micro, suite=arrow-compare-benchmark
  • TypeEqualsSimple (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • SchemaEqualsWithMetadata (C++) with source=cpp-micro, suite=arrow-type-benchmark