After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit e4cdd00.

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 01:52:50Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-10 02:11:25Z
• Commit Run on test-mac-arm at 2025-07-10 04:18:30Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-07-10 02:09:36Z

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 01:52:50Z

  • ChunkCSVEscapedBlock (C++) with source=cpp-micro, suite=arrow-csv-parser-benchmark
  • BenchmarkBitmapVisitUInt64And (C++) with params=131072/1, source=cpp-micro, suite=arrow-bit-util-benchmark
  • ResolveManyUInt64Random (C++) with params=chunked_array_length:65535/num_chunks:100/num_indices:508, source=cpp-micro, suite=arrow-chunk-resolver-benchmark
  • BatchToTensorSimple (C++) with params=/size:32768/num_columns:3, source=cpp-micro, suite=arrow-tensor-benchmark
  • ResolveManyUInt64Sorted (C++) with params=chunked_array_length:65535/num_chunks:10000/num_indices:508, source=cpp-micro, suite=arrow-chunk-resolver-benchmark
  • TakeStringRandomIndicesNoNulls (C++) with params=524288/1, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • BenchmarkBitmapVisitUInt64And (C++) with params=131072/2, source=cpp-micro, suite=arrow-bit-util-benchmark
  • AllocateTouchDeallocate (C++) with params=/size:1048576/real_time/threads:8, source=cpp-micro, suite=arrow-memory-pool-benchmark

• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-10 02:11:25Z

  • TimestampConversionStrptime (C++) with source=cpp-micro, suite=arrow-csv-converter-benchmark
  • ShortVectorPushBack (C++) with params=<SMALL_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • MoveShortVector (C++) with params=<STATIC_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • CopyShortVector (C++) with params=<SMALL_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • RoundArrayBenchmark (C++) with params=<Round, Int32Type, RoundMode::HALF_TOWARDS_ZERO>/size:1048576/inverse_null_proportion:100, source=cpp-micro, suite=arrow-compute-scalar-round-benchmark

• Commit Run on test-mac-arm at 2025-07-10 04:18:30Z

  • ExecuteScalarExpressionOverhead (C++) with params=ref_only_expression/rows_per_batch:10000/real_time/threads:8, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • BM_PlainDecodingSpacedByteArray (C++) with params=max-string-length:64/batch-size:2048, source=cpp-micro, suite=parquet-encoding-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2025-07-10 02:09:36Z

  • ExecuteScalarExpressionBaseline (C++) with params=/rows_per_batch:100000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • ResolveManyUInt64Sorted (C++) with params=chunked_array_length:65535/num_chunks:100/num_indices:508, source=cpp-micro, suite=arrow-chunk-resolver-benchmark
  • ResolveManyUInt64Sorted (C++) with params=chunked_array_length:65535/num_chunks:100/num_indices:32764, source=cpp-micro, suite=arrow-chunk-resolver-benchmark
  • ExecuteScalarExpressionBaseline (C++) with params=/rows_per_batch:10000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • ResolveManyUInt16Random (C++) with params=chunked_array_length:65535/num_chunks:10000/num_indices:32764, source=cpp-micro, suite=arrow-chunk-resolver-benchmark
  • ExecuteScalarExpressionBaseline (C++) with params=/rows_per_batch:1000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • ResolveManyUInt16Random (C++) with params=chunked_array_length:65535/num_chunks:100/num_indices:32764, source=cpp-micro, suite=arrow-chunk-resolver-benchmark