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Changelog

59.1.0 (2026-07-03)

Full Changelog

Implemented enhancements:

• Fast path for nested DictionaryArray casting #10247 [arrow]
• parquet/arrow: reading multiple nested columns fails with "Not all children array length are the same!" when a list continues across DataPageV2 page boundary #10243 [parquet]
• Add product aggregate kernel to arrow-rs #10150 [arrow]
• Stricter DataType parsing #10146 [arrow]
• Support validating CSV headers against Schema #10143 [arrow]
• arrow-ipc: Supports compression level configuration for arrow-ipc writer #10132 [arrow]
• [Variant] VariantArray field API naming #10093
• Add StructArray::field_ APIs symmetric to StructArray::column_ ones #10092 [arrow]
• arrow-buffer: implement Saturating, CheckedShl, Not num-traits for i256 #10087 [arrow]
• feat: native concat for MapArray #10047 [arrow]
• [Variant] Add variant_to_arrow Dictionary/REE type support #10013

Fixed bugs:

• arrow-row on fixed size binary/list with size 0 and no nulls return wrong length #10270
• casting list to 0-size fixedsizelist can cause incorrect output length #10227 [arrow]
• Buffer count mismatched with metadata when encoding records with dictionary of dictionaries #10213 [arrow]
• Buffer::into_mutable is not consistent regarding sliced data and can lead to panics #10117 [arrow]
• parquet_derive: cannot read or write columns whose name is a Rust keyword (raw identifiers like r#type become column "r#type") #10112
• parquet: fix OffsetBuffer panic on corrupt input #10107 [parquet]
• Parquet geospatial conversion uses metadata key "algorithm" instead of "edges" in geoarrow metadata #9929 [parquet]

... (truncated)

Sourced from arrow-schema's changelog.

59.1.0 (2026-07-03)

Full Changelog

Implemented enhancements:

• Fast path for nested DictionaryArray casting #10247 [arrow]
• parquet/arrow: reading multiple nested columns fails with "Not all children array length are the same!" when a list continues across DataPageV2 page boundary #10243 [parquet]
• Add product aggregate kernel to arrow-rs #10150 [arrow]
• Stricter DataType parsing #10146 [arrow]
• Support validating CSV headers against Schema #10143 [arrow]
• arrow-ipc: Supports compression level configuration for arrow-ipc writer #10132 [arrow]
• [Variant] VariantArray field API naming #10093
• Add StructArray::field_ APIs symmetric to StructArray::column_ ones #10092 [arrow]
• arrow-buffer: implement Saturating, CheckedShl, Not num-traits for i256 #10087 [arrow]
• feat: native concat for MapArray #10047 [arrow]
• [Variant] Add variant_to_arrow Dictionary/REE type support #10013

Fixed bugs:

• arrow-row on fixed size binary/list with size 0 and no nulls return wrong length #10270
• casting list to 0-size fixedsizelist can cause incorrect output length #10227 [arrow]
• Buffer count mismatched with metadata when encoding records with dictionary of dictionaries #10213 [arrow]
• Buffer::into_mutable is not consistent regarding sliced data and can lead to panics #10117 [arrow]
• parquet_derive: cannot read or write columns whose name is a Rust keyword (raw identifiers like r#type become column "r#type") #10112
• parquet: fix OffsetBuffer panic on corrupt input #10107 [parquet]
• Parquet geospatial conversion uses metadata key "algorithm" instead of "edges" in geoarrow metadata #9929 [parquet]

Documentation updates:

• doc: More comments to concat_batches #10178 (2010YOUY01)
• Minor: improve PageStore docs with a temp-file spilling example #10074 [parquet] (alamb)

Performance improvements:

• perf: interleave_list for List<Primitive> could be optimized? #10022 [arrow]
• perf(arrow-ord): Avoid full index materialization for small-limit lexsorts #9990 [arrow]
• Replace conversion of binary->string in arrow-row from arraydata to direct construction #10261 [arrow] (Jefffrey)
• [arrow-flight encode path]re-use flatbufferbuilder #10220 [arrow] (Rich-T-kid)
• [10125] arrow-flight decode path optimizations (add skip_validation to arrow-flight) #10206 [arrow] [arrow-flight] (Rich-T-kid)
• Improve performance of concat_elements ByteViewArray concatenation #10161 [arrow] (pepijnve)
• [arrow-flight] Optimize flight, remove some allocations, add dictionary focused benchmarks #10126 [arrow] [arrow-flight] (Rich-T-kid)
• optimize(concat): concat map implementation #10048 [arrow] (mapleFU)
• Reduce copies in Arrow IPC writer #10044 [arrow] (Rich-T-kid)
• perf(interleave): Optimize list interleave_list when child is primitive #10025 [arrow] (mapleFU)

Closed issues:

• Soundness: Unsound alignment contract in public FromBytes trait and BitReader::get_batch #10164 [parquet]
• ParquetPushDecoder: expose the next row-group index that try_next_reader will yield #10148 [parquet]

... (truncated)

• b1de629 Prepare for 59.1.0 release (#10274)
• c36e926 feat: Add support for MapArray in arrow_row (#9486)
• d2519a1 fix(arrow-row): allow to convert non empty fixed size binary/list array with ...
• ddef6cf chore: Fix audit CI run by ignore quick-xml audit advisories (#10267)
• d969025 fix main: parquet test compilation failure (#10266)
• c7dc6b8 Add validated row decode benchmark (#10259)
• 7307740 fix: write error for dbg output of out of range timestamps (#10130)
• af1c24a minor: drive-by refactors for dicts in substring & filter (#10264)
• 7095ce4 Replace conversion of binary->string in arrow-row from arraydata to direct co...
• 8c7df18 reduce noise in flight benchmarks [tokio-threads] [# of columns in benchmarks...
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