After merging your PR, Conbench analyzed the 2 benchmarking runs that have been run so far on merge-commit 0d32975.

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-2xlarge-linux at 2025-10-07 09:11:44Z
• Commit Run on test-mac-arm at 2025-10-07 09:38:45Z

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 arm64-t4g-2xlarge-linux at 2025-10-07 09:11:44Z

  • ShortVectorInsertAtEnd (C++) with params=<STD_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromEmptyStdVector (C++) with params=<SMALL_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromEmptyStdVector (C++) with params=<STD_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • CopyShortVector (C++) with params=<STD_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • MoveEmptyVector (C++) with params=<STATIC_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromShortStdVector (C++) with params=<STATIC_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • BM_UnpackUint64 (C++) with params=DynamicUnaligned/47/1024, source=cpp-micro, suite=arrow-bpacking-benchmark
  • ShortVectorPushBack (C++) with params=<SMALL_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ShortVectorInsert (C++) with params=<SMALL_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ShortVectorPushBack (C++) with params=<STATIC_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromEmptyStdVector (C++) with params=<STD_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromEmptyStdVector (C++) with params=<STATIC_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • CopyEmptyVector (C++) with params=<STD_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • CopyShortVector (C++) with params=<STATIC_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ShortVectorPushBack (C++) with params=<STATIC_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark

• Commit Run on test-mac-arm at 2025-10-07 09:38:45Z

  • FilterOverhead (C++) with params=ref_only_expression/batch_size:10000/null_prob:0/bool_true_prob:50/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • FilterOverhead (C++) with params=selectivity_benchmark/batch_size:1000000/null_prob:50/bool_true_prob:50/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • FilterOverhead (C++) with params=ref_only_expression/batch_size:1000/null_prob:0/bool_true_prob:50/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • FilterOverhead (C++) with params=not_null_and_is_true_singlepass_benchmark/batch_size:10000/null_prob:25/bool_true_prob:33/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • FilterOverhead (C++) with params=selectivity_benchmark/batch_size:1000/null_prob:10/bool_true_prob:50/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • FilterOverhead (C++) with params=ref_only_expression/batch_size:100000/null_prob:0/bool_true_prob:50/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark
  • FilterOverhead (C++) with params=not_null_and_is_true_singlepass_benchmark/batch_size:1000000/null_prob:0/bool_true_prob:25/real_time, source=cpp-micro, suite=arrow-acero-filter-benchmark