CHANGELOG.md - arrow-experimental-rs-arrow2 - Git at Google

 For older versions, see [apache/arrow/CHANGELOG.md](https://github.com/apache/arrow/blob/master/CHANGELOG.md)

 # Changelog

 ## [4.0.1](https://github.com/apache/arrow-rs/tree/4.0.1) (2021-05-16)

 [Full Changelog](https://github.com/apache/arrow-rs/compare/8707fd2b2d17b17bd3e79be0255a18ffaea6914a...4.0.1)

 **Implemented enhancements:**

 - Improve performance of bound checking option [\#280](https://github.com/apache/arrow-rs/issues/280) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
 - extend compute kernel arity to include nullary functions [\#276](https://github.com/apache/arrow-rs/issues/276)
 - Add support for pretty-printing Decimal numbers [\#230](https://github.com/apache/arrow-rs/issues/230) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
 - CSV Reader String Dictionary Support [\#228](https://github.com/apache/arrow-rs/issues/228) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
 - Add Builder interface for adding Arrays to record batches [\#210](https://github.com/apache/arrow-rs/issues/210) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
 - Support auto-vectorization for min/max [\#209](https://github.com/apache/arrow-rs/issues/209) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
 - Support LargeUtf8 in sort kernel [\#25](https://github.com/apache/arrow-rs/issues/25) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]

 **Fixed bugs:**

 - Rust 1.52 Clippy error [\#266](https://github.com/apache/arrow-rs/issues/266)
 - NaNs can break parquet statistics [\#255](https://github.com/apache/arrow-rs/issues/255) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]
 - u64::MAX does not roundtrip through parquet [\#254](https://github.com/apache/arrow-rs/issues/254) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]
 - Integration tests failing to compile \(flatbuffer\) [\#249](https://github.com/apache/arrow-rs/issues/249) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
 - Fix compatibility quirks between arrow and parquet structs [\#245](https://github.com/apache/arrow-rs/issues/245) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]
 - Unable to write non-null Arrow structs to Parquet [\#244](https://github.com/apache/arrow-rs/issues/244) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]
 - Dev PR / Process \(pull\_request\) Failing on PRs [\#242](https://github.com/apache/arrow-rs/issues/242)
 - schema: missing field `metadata` when deserialize [\#241](https://github.com/apache/arrow-rs/issues/241) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
 - Arrow does not compile due to flatbuffers upgrade [\#238](https://github.com/apache/arrow-rs/issues/238) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
 - Sort with limit panics for the limit includes some but not all nulls, for large arrays [\#235](https://github.com/apache/arrow-rs/issues/235) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
 - Read list field correctly in \<struct\<list\>\> [\#167](https://github.com/apache/arrow-rs/issues/167) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]

 **Documentation updates:**

 - Comment out the instructions in the PR template [\#277](https://github.com/apache/arrow-rs/issues/277)
 - Update links to datafusion and ballista in README.md [\#19](https://github.com/apache/arrow-rs/issues/19)
 - Update "repository" in Cargo.toml [\#12](https://github.com/apache/arrow-rs/issues/12)
 - Improve docs for NullArray, new\_null\_array and new\_empty\_array [\#240](https://github.com/apache/arrow-rs/pull/240) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([alamb](https://github.com/alamb))

 **Merged pull requests:**

 - Remove old release scripts [\#293](https://github.com/apache/arrow-rs/pull/293) ([alamb](https://github.com/alamb))
 - manually bump development version [\#288](https://github.com/apache/arrow-rs/pull/288) ([nevi-me](https://github.com/nevi-me))
 - Fix subtraction underflow when sorting string arrays with many nulls [\#285](https://github.com/apache/arrow-rs/pull/285) ([medwards](https://github.com/medwards))
 - Speed up bound checking in `take` [\#281](https://github.com/apache/arrow-rs/pull/281) ([Dandandan](https://github.com/Dandandan))
 - Update PR template by commenting out instructions [\#278](https://github.com/apache/arrow-rs/pull/278) ([nevi-me](https://github.com/nevi-me))
 - Added Decimal support to pretty-print display utility \(\#230\) [\#273](https://github.com/apache/arrow-rs/pull/273) ([mgill25](https://github.com/mgill25))
 - Fix null struct and list roundtrip [\#270](https://github.com/apache/arrow-rs/pull/270) ([nevi-me](https://github.com/nevi-me))
 - 1.52 clippy fixes [\#267](https://github.com/apache/arrow-rs/pull/267) ([nevi-me](https://github.com/nevi-me))
 - Fix typo in csv/reader.rs [\#265](https://github.com/apache/arrow-rs/pull/265) ([domoritz](https://github.com/domoritz))
 - Fix empty Schema::metadata deserialization error [\#260](https://github.com/apache/arrow-rs/pull/260) ([hulunbier](https://github.com/hulunbier))
 - update datafusion and ballista doc links [\#259](https://github.com/apache/arrow-rs/pull/259) ([Jimexist](https://github.com/Jimexist))
 - support full u32 and u64 roundtrip through parquet [\#258](https://github.com/apache/arrow-rs/pull/258) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)] ([crepererum](https://github.com/crepererum))
 - fix NaN handling in parquet statistics [\#256](https://github.com/apache/arrow-rs/pull/256) ([crepererum](https://github.com/crepererum))
 - \[MINOR\] Added env to run rust in integration. [\#253](https://github.com/apache/arrow-rs/pull/253) ([jorgecarleitao](https://github.com/jorgecarleitao))
 - \[Minor\] Made integration tests always run. [\#248](https://github.com/apache/arrow-rs/pull/248) ([jorgecarleitao](https://github.com/jorgecarleitao))
 - fix parquet max\_definition for non-null structs [\#246](https://github.com/apache/arrow-rs/pull/246) ([nevi-me](https://github.com/nevi-me))
 - Disabled rebase needed until demonstrate working. [\#243](https://github.com/apache/arrow-rs/pull/243) ([jorgecarleitao](https://github.com/jorgecarleitao))
 - pin flatbuffers to 0.8.4 [\#239](https://github.com/apache/arrow-rs/pull/239) ([ritchie46](https://github.com/ritchie46))
 - sort\_primitive result is capped to the min of limit or values.len [\#236](https://github.com/apache/arrow-rs/pull/236) ([medwards](https://github.com/medwards))
 - Read list field correctly [\#234](https://github.com/apache/arrow-rs/pull/234) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)] ([nevi-me](https://github.com/nevi-me))
 - Fix code examples for RecordBatch::try\_from\_iter [\#231](https://github.com/apache/arrow-rs/pull/231) ([alamb](https://github.com/alamb))
 - Support string dictionaries in csv reader \(\#228\) [\#229](https://github.com/apache/arrow-rs/pull/229) ([tustvold](https://github.com/tustvold))
 - support LargeUtf8 in sort kernel [\#26](https://github.com/apache/arrow-rs/pull/26) ([ritchie46](https://github.com/ritchie46))
 - Removed unused files [\#22](https://github.com/apache/arrow-rs/pull/22) ([jorgecarleitao](https://github.com/jorgecarleitao))
 - ARROW-12504: Buffer::from\_slice\_ref set correct capacity [\#18](https://github.com/apache/arrow-rs/pull/18) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([tustvold](https://github.com/tustvold))
 - Add GitHub templates [\#17](https://github.com/apache/arrow-rs/pull/17) ([andygrove](https://github.com/andygrove))
 - ARROW-12493: Add support for writing dictionary arrays to CSV and JSON [\#16](https://github.com/apache/arrow-rs/pull/16) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([tustvold](https://github.com/tustvold))
 - ARROW-12426: \[Rust\] Fix concatentation of arrow dictionaries [\#15](https://github.com/apache/arrow-rs/pull/15) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([tustvold](https://github.com/tustvold))
 - Update repository and homepage urls [\#14](https://github.com/apache/arrow-rs/pull/14) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] [[arrow-flight](https://github.com/apache/arrow-rs/labels/arrow-flight)] [[parquet](https://github.com/apache/arrow-rs/labels/parquet)] ([Dandandan](https://github.com/Dandandan))
 - Added rebase-needed bot [\#13](https://github.com/apache/arrow-rs/pull/13) ([jorgecarleitao](https://github.com/jorgecarleitao))
 - Added Integration tests against arrow [\#10](https://github.com/apache/arrow-rs/pull/10) ([jorgecarleitao](https://github.com/jorgecarleitao))
 - ARROW-12343: \[Rust\] Support auto-vectorization for min/max [\#9](https://github.com/apache/arrow-rs/pull/9) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([Dandandan](https://github.com/Dandandan))
 - ARROW-12411: \[Rust\] Create RecordBatches from Iterators [\#7](https://github.com/apache/arrow-rs/pull/7) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([alamb](https://github.com/alamb))


 \* *This Changelog was automatically generated by [github_changelog_generator](https://github.com/github-changelog-generator/github-changelog-generator)*
	For older versions, see [apache/arrow/CHANGELOG.md](https://github.com/apache/arrow/blob/master/CHANGELOG.md)

	# Changelog

	## [4.0.1](https://github.com/apache/arrow-rs/tree/4.0.1) (2021-05-16)

	[Full Changelog](https://github.com/apache/arrow-rs/compare/8707fd2b2d17b17bd3e79be0255a18ffaea6914a...4.0.1)

	Implemented enhancements:

	- Improve performance of bound checking option [\#280](https://github.com/apache/arrow-rs/issues/280) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
	- extend compute kernel arity to include nullary functions [\#276](https://github.com/apache/arrow-rs/issues/276)
	- Add support for pretty-printing Decimal numbers [\#230](https://github.com/apache/arrow-rs/issues/230) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
	- CSV Reader String Dictionary Support [\#228](https://github.com/apache/arrow-rs/issues/228) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
	- Add Builder interface for adding Arrays to record batches [\#210](https://github.com/apache/arrow-rs/issues/210) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
	- Support auto-vectorization for min/max [\#209](https://github.com/apache/arrow-rs/issues/209) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
	- Support LargeUtf8 in sort kernel [\#25](https://github.com/apache/arrow-rs/issues/25) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]

	Fixed bugs:

	- Rust 1.52 Clippy error [\#266](https://github.com/apache/arrow-rs/issues/266)
	- NaNs can break parquet statistics [\#255](https://github.com/apache/arrow-rs/issues/255) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]
	- u64::MAX does not roundtrip through parquet [\#254](https://github.com/apache/arrow-rs/issues/254) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]
	- Integration tests failing to compile \(flatbuffer\) [\#249](https://github.com/apache/arrow-rs/issues/249) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
	- Fix compatibility quirks between arrow and parquet structs [\#245](https://github.com/apache/arrow-rs/issues/245) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]
	- Unable to write non-null Arrow structs to Parquet [\#244](https://github.com/apache/arrow-rs/issues/244) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]
	- Dev PR / Process \(pull\_request\) Failing on PRs [\#242](https://github.com/apache/arrow-rs/issues/242)
	- schema: missing field `metadata` when deserialize [\#241](https://github.com/apache/arrow-rs/issues/241) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
	- Arrow does not compile due to flatbuffers upgrade [\#238](https://github.com/apache/arrow-rs/issues/238) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
	- Sort with limit panics for the limit includes some but not all nulls, for large arrays [\#235](https://github.com/apache/arrow-rs/issues/235) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)]
	- Read list field correctly in \<struct\<list\>\> [\#167](https://github.com/apache/arrow-rs/issues/167) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)]

	Documentation updates:

	- Comment out the instructions in the PR template [\#277](https://github.com/apache/arrow-rs/issues/277)
	- Update links to datafusion and ballista in README.md [\#19](https://github.com/apache/arrow-rs/issues/19)
	- Update "repository" in Cargo.toml [\#12](https://github.com/apache/arrow-rs/issues/12)
	- Improve docs for NullArray, new\_null\_array and new\_empty\_array [\#240](https://github.com/apache/arrow-rs/pull/240) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([alamb](https://github.com/alamb))

	Merged pull requests:

	- Remove old release scripts [\#293](https://github.com/apache/arrow-rs/pull/293) ([alamb](https://github.com/alamb))
	- manually bump development version [\#288](https://github.com/apache/arrow-rs/pull/288) ([nevi-me](https://github.com/nevi-me))
	- Fix subtraction underflow when sorting string arrays with many nulls [\#285](https://github.com/apache/arrow-rs/pull/285) ([medwards](https://github.com/medwards))
	- Speed up bound checking in `take` [\#281](https://github.com/apache/arrow-rs/pull/281) ([Dandandan](https://github.com/Dandandan))
	- Update PR template by commenting out instructions [\#278](https://github.com/apache/arrow-rs/pull/278) ([nevi-me](https://github.com/nevi-me))
	- Added Decimal support to pretty-print display utility \(\#230\) [\#273](https://github.com/apache/arrow-rs/pull/273) ([mgill25](https://github.com/mgill25))
	- Fix null struct and list roundtrip [\#270](https://github.com/apache/arrow-rs/pull/270) ([nevi-me](https://github.com/nevi-me))
	- 1.52 clippy fixes [\#267](https://github.com/apache/arrow-rs/pull/267) ([nevi-me](https://github.com/nevi-me))
	- Fix typo in csv/reader.rs [\#265](https://github.com/apache/arrow-rs/pull/265) ([domoritz](https://github.com/domoritz))
	- Fix empty Schema::metadata deserialization error [\#260](https://github.com/apache/arrow-rs/pull/260) ([hulunbier](https://github.com/hulunbier))
	- update datafusion and ballista doc links [\#259](https://github.com/apache/arrow-rs/pull/259) ([Jimexist](https://github.com/Jimexist))
	- support full u32 and u64 roundtrip through parquet [\#258](https://github.com/apache/arrow-rs/pull/258) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)] ([crepererum](https://github.com/crepererum))
	- fix NaN handling in parquet statistics [\#256](https://github.com/apache/arrow-rs/pull/256) ([crepererum](https://github.com/crepererum))
	- \[MINOR\] Added env to run rust in integration. [\#253](https://github.com/apache/arrow-rs/pull/253) ([jorgecarleitao](https://github.com/jorgecarleitao))
	- \[Minor\] Made integration tests always run. [\#248](https://github.com/apache/arrow-rs/pull/248) ([jorgecarleitao](https://github.com/jorgecarleitao))
	- fix parquet max\_definition for non-null structs [\#246](https://github.com/apache/arrow-rs/pull/246) ([nevi-me](https://github.com/nevi-me))
	- Disabled rebase needed until demonstrate working. [\#243](https://github.com/apache/arrow-rs/pull/243) ([jorgecarleitao](https://github.com/jorgecarleitao))
	- pin flatbuffers to 0.8.4 [\#239](https://github.com/apache/arrow-rs/pull/239) ([ritchie46](https://github.com/ritchie46))
	- sort\_primitive result is capped to the min of limit or values.len [\#236](https://github.com/apache/arrow-rs/pull/236) ([medwards](https://github.com/medwards))
	- Read list field correctly [\#234](https://github.com/apache/arrow-rs/pull/234) [[parquet](https://github.com/apache/arrow-rs/labels/parquet)] ([nevi-me](https://github.com/nevi-me))
	- Fix code examples for RecordBatch::try\_from\_iter [\#231](https://github.com/apache/arrow-rs/pull/231) ([alamb](https://github.com/alamb))
	- Support string dictionaries in csv reader \(\#228\) [\#229](https://github.com/apache/arrow-rs/pull/229) ([tustvold](https://github.com/tustvold))
	- support LargeUtf8 in sort kernel [\#26](https://github.com/apache/arrow-rs/pull/26) ([ritchie46](https://github.com/ritchie46))
	- Removed unused files [\#22](https://github.com/apache/arrow-rs/pull/22) ([jorgecarleitao](https://github.com/jorgecarleitao))
	- ARROW-12504: Buffer::from\_slice\_ref set correct capacity [\#18](https://github.com/apache/arrow-rs/pull/18) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([tustvold](https://github.com/tustvold))
	- Add GitHub templates [\#17](https://github.com/apache/arrow-rs/pull/17) ([andygrove](https://github.com/andygrove))
	- ARROW-12493: Add support for writing dictionary arrays to CSV and JSON [\#16](https://github.com/apache/arrow-rs/pull/16) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([tustvold](https://github.com/tustvold))
	- ARROW-12426: \[Rust\] Fix concatentation of arrow dictionaries [\#15](https://github.com/apache/arrow-rs/pull/15) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([tustvold](https://github.com/tustvold))
	- Update repository and homepage urls [\#14](https://github.com/apache/arrow-rs/pull/14) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] [[arrow-flight](https://github.com/apache/arrow-rs/labels/arrow-flight)] [[parquet](https://github.com/apache/arrow-rs/labels/parquet)] ([Dandandan](https://github.com/Dandandan))
	- Added rebase-needed bot [\#13](https://github.com/apache/arrow-rs/pull/13) ([jorgecarleitao](https://github.com/jorgecarleitao))
	- Added Integration tests against arrow [\#10](https://github.com/apache/arrow-rs/pull/10) ([jorgecarleitao](https://github.com/jorgecarleitao))
	- ARROW-12343: \[Rust\] Support auto-vectorization for min/max [\#9](https://github.com/apache/arrow-rs/pull/9) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([Dandandan](https://github.com/Dandandan))
	- ARROW-12411: \[Rust\] Create RecordBatches from Iterators [\#7](https://github.com/apache/arrow-rs/pull/7) [[arrow](https://github.com/apache/arrow-rs/labels/arrow)] ([alamb](https://github.com/alamb))



	\* This Changelog was automatically generated by [github_changelog_generator](https://github.com/github-changelog-generator/github-changelog-generator)