Changelog

58.3.0 (2026-05-07)

Full Changelog

Implemented enhancements:

• Add DatePart::from_str API #9930 [arrow]
• should use DictionaryArray::with_values instead of try_new on the dictionary fast path #9889 [arrow]
• [arrow-string] add concat_elements for BinaryViewArray and FixedSizeBinary #9875 [arrow]
• Expose eq ignore ascii case from arrow-string #9870 [arrow]
• Configurable data page v2 compression threshold #9827 [parquet]

Fixed bugs:

• [arrow-cast] incorrect Time32 -> Time64 conversion #9851 [arrow]
• Panic when reading malformed compact-Thrift bool fields in Parquet page metadata #9839 [parquet]
• Parquet DeltaBitPackDecoder::skip could panic on "non-standard" miniblocks #9793 [parquet]

Documentation updates:

• docs: Add guidance for AI assisted submissions to CONTRIBUTING.md #9892 (etseidl)
• Update release schedule on README #9881 (alamb)
• Add more documentation for FixedSizeBinary arrays #9866 [arrow] (alamb)
• Minor: document why FixedSizeBinary offset is always 0 #9861 [arrow] (alamb)
• docs: Update contributing guidelines with benchmark results #9782 (alamb)

Closed issues:

• GenericByteDictionaryBuilder::with_capacity does not pre-size dedup HashTable #9907 [arrow]
• [arrow-buffer] Integer overflow in repeat_slice_n_times leads to undefined behavior #9904 [arrow]
• [arrow-buffer] Integer overflow in BitChunks::new leads to undefined behavior #9903 [arrow]
• [arrow-row] Integer overflow in Rows::row index handling leads to undefined behavior #9901 [arrow]
• [arrow-data] Integer overflow in ArrayData validation leads to undefined behavior #9900 [arrow]
• [arrow-data] Integer overflow in ArrayData::slice leads to undefined behavior #9899 [arrow]
• [arrow-array] Integer overflow in FixedSizeBinaryArray::value leads to undefined behavior #9898 [arrow]
• [arrow-buffer] Integer overflow in BufferBuilder::reserve leads to undefined behavior #9897 [arrow]
• arrow-csv: integer overflow panic in Reader::records::flush #9885 [arrow]
• Make an API to help with the pattern of 'replaces the values of the REE array' #9854 [arrow]
• Parquet reader rejects canonical UNKNOWN logical type on BOOLEAN physical columns #9844 [parquet]
• ColumnIndex length mismatch can cause panic during decoding in Parquet #9832 [parquet]
• Bug converting json to fixed list of zero size #9780 [arrow]

Merged pull requests:

• impl FromStr for DatePart #9931 [arrow] (sdf-jkl)
• Pre-size dedup HashTable in GenericByteDictionaryBuilder::with_capacity #9908 [arrow] (rabenhorst)
• [arrow-array] Use consistent value_length name in FixedSizeBinaryArray #9905 [arrow] (alamb)
• replace Dictionary::try_new() calls with with_values. #9894 [arrow] (Rich-T-kid)
• API to help with the pattern of 'replaces the values of the REE array #9891 [arrow] (Rich-T-kid)
• fix(arrow-csv): bound RecordDecoder::flush offset accumulation #9886 [arrow] (masumi-ryugo)
• fix(parquet): bound schema num_children before Vec::with_capacity #9884 [parquet] (masumi-ryugo)
• feat(arrow-string): concat_elements for view, fixed binary #9876 [arrow] (theirix)
• Prevent FixedSizeBinaryArray i32 offset overflows (try 2) #9872 [arrow] (alamb)
• [arrow-string]: add like::eq_ascii_ignore_case kernel #9871 [arrow] (albertlockett)
• fix(parquet): Prevent negative list sizes in Thrift compact protocol parser #9868 [parquet] (masumi-ryugo)
• [PARQUET] Allow UNKNOWN logical type annotation on any physical type #9855 [parquet] (etseidl)
• [arrow-ipc]: dictionary builders for delta - doc fix and integration tests for nested types #9853 [arrow] (albertlockett)
• fix(arrow-cast): fix incorrect conversion #9852 [arrow] (bboissin)
• chore[benches]: add REE interleave benchmarks #9849 [arrow] (asubiotto)
• test(parquet): replace InMemoryArrayReader with PrimitiveArrayReader in tests #9847 [parquet] (HippoBaro)
• REE row conversion speed up #9845 [arrow] (Rich-T-kid)
• fix(parquet): Avoid panic on malformed thrift bool fields in parquet metadata #9840 [parquet] (BoazC-MSFT)
• fix(parquet): avoid panic on ColumnIndex length mismatch #9833 [parquet] (pchintar)
• configurable data page v2 compression threshold #9826 [parquet] (leoyvens)
• Prevent ArrayData::slice length overflow #9813 [arrow] (alamb)
• Fix JSON reader panic for non-nullable zero-size FixedSizeList #9810 [arrow] (liamzwbao)
• [Parquet] Do not panic when trying to skip records in delta encoded files using non-standard block sizes #9794 [parquet] (etseidl)

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