After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 5852134.

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 2025-07-08 17:22:39Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-07-08 18:43:40Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-08 18:48:55Z
• Commit Run on test-mac-arm at 2025-07-08 23:15:36Z

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 2025-07-08 17:22:39Z

  • ArrayArrayKernel (C++) with params=<AddChecked, UInt32Type>/size:524288/inverse_null_proportion:100, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • BenchmarkTemporalRounding (C++) with params=<CeilTemporal, non_zoned, round_1_minute>/524288/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark
  • MaxElementWiseArrayArrayString (C++) with params=32768/100, source=cpp-micro, suite=arrow-compute-scalar-compare-benchmark
  • ArrayRankInt64Narrow (C++) with params=32768/10/tiebreaker:0, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • MaxElementWiseArrayArrayString (C++) with params=32768/10000, source=cpp-micro, suite=arrow-compute-scalar-compare-benchmark
  • MaxElementWiseArrayArrayString (C++) with params=32768/0, source=cpp-micro, suite=arrow-compute-scalar-compare-benchmark
  • ArrayRankInt64Narrow (C++) with params=1048576/100/tiebreaker:2, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • ArrayRankInt64Narrow (C++) with params=32768/100/tiebreaker:0, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • ArrayRankInt64Narrow (C++) with params=32768/10/tiebreaker:3, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2025-07-08 18:43:40Z

  • AllocateTouchDeallocate (C++) with params=/size:1048576/real_time/threads:2, source=cpp-micro, suite=arrow-memory-pool-benchmark
  • ReadFileMetadata (C++) with params=num_columns:1000/num_row_groups:1, source=cpp-micro, suite=parquet-metadata-benchmark
  • BM_BatchComputeHash (C++) with params=, source=cpp-micro, suite=parquet-bloom-filter-benchmark
  • ErrorSchemeResultNoInline (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • WriteFileMetadataAndData (C++) with params=num_columns:100/num_row_groups:1000, source=cpp-micro, suite=parquet-metadata-benchmark
  • ColumnReaderReadBatchInt32 (C++) with params=Repetition:1/BatchSize:1000, source=cpp-micro, suite=parquet-column-reader-benchmark
  • BM_DeltaDecodingByteArray (C++) with params=max-string-length:1024/batch-size:2048/prefixed-percent:99, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ReadListOfStructColumn (C++) with params=99, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=32768/1000, source=cpp-micro, suite=arrow-int-util-benchmark
  • MemoryBandwidth (C++) with params=/size:2097152, source=cpp-micro, suite=arrow-io-memory-benchmark
  • ReadFileMetadata (C++) with params=num_columns:100/num_row_groups:1, source=cpp-micro, suite=parquet-metadata-benchmark
  • BM_RleDecoding (C++) with params=65536/8, source=cpp-micro, suite=parquet-column-io-benchmark
  • FloatParsing (C++) with params=, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • BM_DecodeArrowBooleanRle (C++) with params=DecodeArrowWithNull/num_values:16384/null_in_ten_thousand:5000, source=cpp-micro, suite=parquet-encoding-benchmark
  • RecordReaderSkipRecords (C++) with params=Repetition:1/BatchSize:1000, source=cpp-micro, suite=parquet-column-reader-benchmark
  • ListSliceStringListWithStop (C++) with params=32768/1, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark
  • MemoizeLruCachedThreadUnsafe (C++) with params=8/1024, source=cpp-micro, suite=arrow-cache-benchmark
  • ArrayArrayKernel (C++) with params=<Subtract, UInt32Type>/size:1048576/inverse_null_proportion:0, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • BM_DecodeArrowBooleanRle (C++) with params=DecodeArrowWithNull/num_values:4096/null_in_ten_thousand:5000, source=cpp-micro, suite=parquet-encoding-benchmark
  • CastUInt32ToInt32Safe (C++) with params=1048576/1000, source=cpp-micro, suite=arrow-compute-scalar-cast-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=32768/2, source=cpp-micro, suite=arrow-int-util-benchmark
  • BM_RleDecoding (C++) with params=32768/16, source=cpp-micro, suite=parquet-column-io-benchmark
  • ListSliceInt64ListView (C++) with params=32768/1, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark
  • BM_RleDecoding (C++) with params=4096/8, source=cpp-micro, suite=parquet-column-io-benchmark
  • WriteFileMetadataAndData (C++) with params=num_columns:1000/num_row_groups:100, source=cpp-micro, suite=parquet-metadata-benchmark
  • BM_BatchComputeHash (C++) with params=, source=cpp-micro, suite=parquet-bloom-filter-benchmark
  • BM_DecodeArrowBooleanPlain (C++) with params=DecodeArrowWithNull/num_values:65536/null_in_ten_thousand:10000, source=cpp-micro, suite=parquet-encoding-benchmark
  • ArrayRangeEqualsFixedSizeBinary (C++) with params=32768/2, source=cpp-micro, suite=arrow-compare-benchmark
  • ListSliceInt64ListViewWithStop (C++) with params=32768/1, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark
  • ErrorSchemeBoolNoInline (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • MemoizeLruCachedThreadUnsafe (C++) with params=8/16, source=cpp-micro, suite=arrow-cache-benchmark
  • ListSliceInt64ListViewWithStepAndStop (C++) with params=32768/1, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark
  • ExportArray (C++) with source=cpp-micro, suite=arrow-bridge-benchmark
  • TakeChunkedChunkedStringRandomIndicesWithNulls (C++) with params=1048576/0, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • LongVectorPushBack (C++) with params=<SMALL_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • FilterInt64FilterNoNulls (C++) with params=1048576/5, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • BM_DecodeArrowBooleanPlain (C++) with params=DecodeArrowWithNull/num_values:65536/null_in_ten_thousand:100, source=cpp-micro, suite=parquet-encoding-benchmark
  • BenchmarkBitmapVisitUInt64And (C++) with params=131072/1, source=cpp-micro, suite=arrow-bit-util-benchmark
  • TimestampParsingISO8601 (C++) with params=TimeUnit::SECOND, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • ColumnReaderSkipInt32 (C++) with params=Repetition:2/BatchSize:1000, source=cpp-micro, suite=parquet-column-reader-benchmark
  • AllocateDeallocate (C++) with params=/size:16777216/real_time/threads:8, source=cpp-micro, suite=arrow-memory-pool-benchmark
  • WriteFileMetadataAndData (C++) with params=num_columns:10/num_row_groups:1, source=cpp-micro, suite=parquet-metadata-benchmark
  • BM_DefinitionLevelsToBitmapRepeatedAllPresent (C++) with source=cpp-micro, suite=parquet-level-conversion-benchmark
  • BM_BatchComputeHash (C++) with params=, source=cpp-micro, suite=parquet-bloom-filter-benchmark
  • FilterFixedSizeBinaryFilterNoNulls (C++) with params=1048576/5/8, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • ToString (C++) with source=cpp-micro, suite=arrow-decimal-benchmark
  • TimestampParsingISO8601 (C++) with params=TimeUnit::NANO, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • ArraySortIndicesInt64WideDict (C++) with params=8388608/100, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • BM_ReadBinaryColumnDeltaByteArray (C++) with params=null_probability:50/unique_values:-1, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark
  • ListSliceInt64ListWithStepAndStop (C++) with params=32768/10, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark
  • BM_RleDecoding (C++) with params=32768/8, source=cpp-micro, suite=parquet-column-io-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=1048576/1000, source=cpp-micro, suite=arrow-int-util-benchmark
  • BM_DecodeArrowBooleanRle (C++) with params=DecodeArrowWithNull/num_values:65536/null_in_ten_thousand:5000, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_WriteColumn (C++) with params=<false,DoubleType>, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark
  • AsOfJoinOverhead (C++) with params=left_freq:400/left_cols:20/left_ids:500/batch_size:4000/num_right_tables:1/right_freq:400/right_cols:20/right_ids:500/real_time, source=cpp-micro, suite=arrow-acero-asof-join-benchmark
  • WriteFileMetadataAndData (C++) with params=num_columns:1000/num_row_groups:1, source=cpp-micro, suite=parquet-metadata-benchmark
  • TypeEqualsWithMetadata (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • BM_DecodeArrowBooleanRle (C++) with params=DecodeArrowWithNull/num_values:65536/null_in_ten_thousand:1000, source=cpp-micro, suite=parquet-encoding-benchmark
  • ListSliceStringListViewWithStop (C++) with params=32768/1, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark
  • ReadBufferAsync (C++) with params=num_cols:8/is_partial:1/real_time, source=cpp-micro, suite=arrow-ipc-read-write-benchmark
  • SchemaEquals (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • NthToIndicesInt64 (C++) with params=8388608/100, source=cpp-micro, suite=arrow-compute-vector-partition-benchmark
  • BM_ReadMultipleRowGroupsGenerator (C++) with source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark
  • FilterFixedSizeBinaryFilterNoNulls (C++) with params=1048576/8/8, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • BM_ComputeHash (C++) with params=, source=cpp-micro, suite=parquet-bloom-filter-benchmark
  • ArrayArrayKernel (C++) with params=<Subtract, UInt16Type>/size:1048576/inverse_null_proportion:100, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • FilterStringFilterWithNulls (C++) with params=1048576/1, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • FilterFixedSizeBinaryFilterNoNulls (C++) with params=1048576/11/9, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • ListSliceInt64ListWithStepAndStop (C++) with params=32768/100, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark
  • WriteFileMetadataAndData (C++) with params=num_columns:100/num_row_groups:1, source=cpp-micro, suite=parquet-metadata-benchmark
  • FilterFixedSizeBinaryFilterWithNulls (C++) with params=1048576/2/9, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • ArrayScalarKernel (C++) with params=<Add, Int16Type>/size:1048576/inverse_null_proportion:0, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • CastUInt32ToInt32Safe (C++) with params=1048576/0, source=cpp-micro, suite=arrow-compute-scalar-cast-benchmark
  • ArrayArrayKernel (C++) with params=<Subtract, UInt32Type>/size:1048576/inverse_null_proportion:100, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • ArrayRangeEqualsBoolean (C++) with params=32768/100, source=cpp-micro, suite=arrow-compare-benchmark
  • HexParsing (C++) with params=, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • BM_BatchComputeHash (C++) with params=, source=cpp-micro, suite=parquet-bloom-filter-benchmark
  • CheckIndexBoundsInt32 (C++) with params=32768/0, source=cpp-micro, suite=arrow-int-util-benchmark
  • ArrayScalarKernel (C++) with params=<Subtract, UInt16Type>/size:1048576/inverse_null_proportion:100, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • WriteCsvStringRejectQuote (C++) with params=1, source=cpp-micro, suite=arrow-csv-writer-benchmark
  • FloatConversion (C++) with source=cpp-micro, suite=arrow-csv-converter-benchmark
  • WriteFileMetadataAndData (C++) with params=num_columns:1/num_row_groups:1000, source=cpp-micro, suite=parquet-metadata-benchmark
  • ArrayScalarKernel (C++) with params=<Subtract, UInt32Type>/size:1048576/inverse_null_proportion:0, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=32768/10, source=cpp-micro, suite=arrow-int-util-benchmark
  • BuildIntArrayNoNulls (C++) with source=cpp-micro, suite=arrow-builder-benchmark
  • CastUInt32ToInt32Safe (C++) with params=1048576/1, source=cpp-micro, suite=arrow-compute-scalar-cast-benchmark
  • ExecuteScalarExpressionOverhead (C++) with params=complex_expression/rows_per_batch:10000/real_time/threads:16, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • BM_ComputeHash (C++) with params=, source=cpp-micro, suite=parquet-bloom-filter-benchmark

• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-08 18:48:55Z

  • BM_RleDecodingBoolean (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark
  • ChunkedArraySortIndicesInt64Narrow (C++) with params=65536/1, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • BM_DeltaBitPackingDecode_Int32_Wide (C++) with params=1024, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_RleDecodingBoolean (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark
  • ChunkedArrayRankInt64Wide (C++) with params=65536/10/tiebreaker:0, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark
  • BatchToTensorSimple (C++) with params=/size:65536/num_columns:30, source=cpp-micro, suite=arrow-tensor-benchmark
  • ArrayRankInt64Wide (C++) with params=65536/10/tiebreaker:2, source=cpp-micro, suite=arrow-compute-vector-sort-benchmark

• Commit Run on test-mac-arm at 2025-07-08 23:15:36Z

  • ResolveManyUInt32Sorted (C++) with params=chunked_array_length:65535/num_chunks:100/num_indices:508, source=cpp-micro, suite=arrow-chunk-resolver-benchmark