apache/arrow

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Apache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics

Stars: 17.1k
Forks: 4.3k
Open beginner issues: 0
Indexed issues: 2.2k
Avg merge: 3d 23h
Merged PRs (30d): 100

Dominant language: C++
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

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2,130 open issues indexed

[C++] Make `float16` part of `FloatingPointTypes()` Open

Component: C++ Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 68/100

apache/arrow#51311 · 1 comment · Opened Sep 11, 2026
[C++] GZipCodec::Init does deflateInit and immediately throws it away Open

Component: C++ Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

apache/arrow#51308 · Opened Sep 11, 2026
[Python][JSON] Leading null list elements produce invalid list offsets during type inference Open

Difficulty 4/5 3-5 days Newbie friendliness 56/100

apache/arrow#51305 · 1 reaction · Opened Sep 11, 2026
[Python] Update pandas->pyarrow conversion for the .values deprecation in pandas Open

Component: Python

apache/arrow#51302 · 1 assignee · Opened Sep 11, 2026
[Python] Fix deprecation warnings in the tests with numpy/pandas nightly Open

Component: Continuous Integration Component: Python

Difficulty 3/5 1-2 days Newbie friendliness 72/100

apache/arrow#51301 · Opened Sep 11, 2026
[Python] Fix deprecation warnings for RankOptions null_placement in our own tests Open

Component: Python

apache/arrow#51300 · 5 comments · 1 assignee · Opened Sep 11, 2026
[Python] get_partition_keys segfaults when the partition expression is None Open

Component: Python

apache/arrow#51293 · 1 assignee · Opened Sep 10, 2026
[C++] Add iterator-based variants of bit-run visitors Open

Component: C++ good-second-issue Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 58/100

apache/arrow#51289 · Opened Sep 10, 2026
[C++] Allow the CSV Reader to accept multi-character delimiters Open

Component: C++ Type: enhancement

apache/arrow#51275 · 1 assignee · Opened Sep 10, 2026
[Ruby] Add `ArrowFormat::FixedSizeListArray.new(type, values)` Open

Component: Ruby

apache/arrow#51273 · 1 comment · 1 assignee · Opened Sep 10, 2026
[C++][Parquet] Speed up DELTA_BINARY_PACKED decoding Open

Component: C++ Type: enhancement

apache/arrow#51268 · 1 assignee · Opened Sep 9, 2026
[C++] Remove the vendored datetime fallback when toolchain support permits Open

Component: C++ Type: enhancement

apache/arrow#51267 · 2 comments · 1 assignee · Opened Sep 9, 2026
[Python][Parquet] Reorganize Parquet reader docstrings Open

Component: Parquet Component: Python good-first-issue Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 65/100

apache/arrow#51265 · 1 comment · Opened Sep 9, 2026
[Python][Docs][CI] Disabled numpydoc PR02 check may skip PR03 Open

Component: Continuous Integration Component: Documentation Component: Python Type: bug

apache/arrow#51260 · 1 comment · 1 assignee · Opened Sep 9, 2026
[CI][Dev][Archery] Default ARCHERY_DEBUG to True on archery docker commands Open

Component: Archery Component: Continuous Integration Component: Developer Tools Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

apache/arrow#51256 · 5 comments · Opened Sep 9, 2026
[C++][Gandiva] Add support for LLVM 23.1 Open

Component: C++ Component: Gandiva Type: enhancement

apache/arrow#51245 · 2 comments · 1 assignee · Opened Sep 8, 2026
[C++][Substrait] RelCommon.emit indices are not bounds-checked before they index the schema Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

apache/arrow#51243 · 1 comment · Opened Sep 8, 2026
[C++][Substrait] Modern extension URNs fall back to function-name matching Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

apache/arrow#51234 · 1 comment · Opened Sep 8, 2026
[C++][Acero] Preserve input nullability in direct field projections Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

apache/arrow#51231 · Opened Sep 8, 2026
[Python] `flight` wrappers and `ParquetReader` segfault when used without initialized native state Open

Component: Python Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

apache/arrow#51230 · 2 comments · Opened Sep 8, 2026
[Python] `MemoryMappedFile().resize()` segfaults when no file has been opened Open

Component: Python Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 70/100

apache/arrow#51229 · Opened Sep 8, 2026
[Python] `call_tabular_function()` segfaults for some wrong typed `func_registry` values Open

Component: Python Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

apache/arrow#51228 · Opened Sep 8, 2026
[C++] winsorize on a sliced array ignores the offset: wrong rows come out null Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

apache/arrow#51224 · Opened Sep 8, 2026
[C++] fill_null_forward, fill_null_backward and replace_with_mask read the wrong bits on a sliced boolean array Open

apache/arrow#51223 · 1 comment · 1 assignee · Opened Sep 8, 2026
[C++] binary_slice with its default `stop` raises "Negative buffer resize" Open

Difficulty 3/5 1-2 days Newbie friendliness 75/100

apache/arrow#51222 · 1 comment · Opened Sep 8, 2026
[Python] Check `write_table` options are accepted by dataset writer Open

Component: Python Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 72/100

apache/arrow#51220 · 1 comment · Opened Sep 7, 2026
[C++][Gandiva] Reduce dependency on vendored date.h library Open

Component: C++ Component: Gandiva Type: enhancement

apache/arrow#51215 · 2 comments · 1 assignee · Opened Sep 7, 2026
[Python][GPU] numba-cuda dependency is maintenance mode only Open

Component: GPU Component: Python Type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

apache/arrow#51204 · 12 comments · Opened Sep 7, 2026
[R] ALTREP crash in base R due to use-after-free Open

Component: R Type: bug

apache/arrow#51198 · 5 comments · 1 assignee · Opened Sep 7, 2026
[Python][Parquet] Improve usability of ParquetDataset Open

Component: Parquet Component: Python

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/arrow#51155 · Opened Sep 3, 2026
[Python] `.slice` methods should accept Arrow scalar types Open

Component: Python Type: enhancement

apache/arrow#51145 · 2 comments · 1 assignee · Opened Sep 3, 2026
[Format] Define Canonical Extension Type for FILE type Open

Component: Format Type: enhancement

apache/arrow#51143 · 3 reactions · 1 assignee · Opened Sep 2, 2026
[C++][CI] Remove the macOS workaround for deprecated Abseil APIs in google-cloud-cpp Open

Component: C++ Component: Continuous Integration Type: enhancement

apache/arrow#51131 · 4 comments · 1 assignee · Opened Sep 2, 2026
[C++] is_null(nan_is_null=true) ignores NaN and null values in dictionary-encoded float arrays Open

Component: C++

apache/arrow#51127 · 1 assignee · Opened Sep 1, 2026
[FlightSQL][C++][ODBC] Add DML support to the ODBC driver Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/arrow#51115 · Opened Sep 1, 2026
[FlightSQL][C++] Expose is_update field of PreparedStatement Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

apache/arrow#51114 · Opened Sep 1, 2026
[Python][C++][Parquet] null_count statistics undercount for a fixed-width leaf under list<struct<...>> when lists are null or empty Open

Component: C++ Component: Parquet Component: Python

Difficulty 4/5 3-5 days Newbie friendliness 68/100

apache/arrow#51097 · 1 comment · Opened Aug 31, 2026
[C++][Acero] record_batch_reader_source doesn't seem to apply backpressure Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/arrow#51047 · 1 comment · Opened Aug 30, 2026
[Python][Interchange] from_dataframe drops the categorical ordered flag Open

Component: Python

apache/arrow#51046 · 1 assignee · Opened Aug 30, 2026
[Python] Several APIs segfault when required Arrow object arguments are `None` Open

Component: Python Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

apache/arrow#51043 · 1 comment · Opened Aug 30, 2026
[Python] Several APIs segfault instead of rejecting arguments of the wrong type Open

Component: Python Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 50/100

apache/arrow#51042 · 1 comment · Opened Aug 30, 2026
[C++] Replace RapidJSON with simdjson in JSON parser Open

Component: C++ Type: enhancement

apache/arrow#51037 · 1 assignee · Opened Aug 29, 2026
[Python] `KeyValueMetadata.key()` segfaults on an out-of-range index Open

Component: Python Type: bug

apache/arrow#51019 · 4 comments · 1 assignee · Opened Aug 28, 2026
[C++][Python] pyarrow.compute.indices_nonzero segfaults on a ChunkedArray with zero chunks Open

Component: C++ Component: Python

apache/arrow#51018 · 2 comments · 1 assignee · Opened Aug 27, 2026
[C++][CI] arrow-gcsfs-test reports "failed to listen" when the testbench is just slow to start Open

Component: C++ Type: bug

apache/arrow#51011 · 1 assignee · Opened Aug 26, 2026
[C++] Bump vendored utfcpp Open

Component: C++ Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

apache/arrow#51009 · 1 comment · Opened Aug 26, 2026
[C++] Remove vendored whereami Open

Component: C++ Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

apache/arrow#51008 · 3 comments · Opened Aug 26, 2026
[C++] Bump vendored uriparser Open

Component: C++ Type: bug

apache/arrow#51007 · 3 comments · 1 assignee · Opened Aug 26, 2026
[CI][Dev] Document how to maintain `CROSSBOW_GITHUB_TOKEN` Open

Component: Continuous Integration Component: Developer Tools Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 65/100

apache/arrow#51001 · 4 comments · Opened Aug 25, 2026
[CI][Python] CMakeLists detects ccache but not sccache Open

Component: Continuous Integration Component: Python Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

apache/arrow#50996 · 6 comments · Opened Aug 25, 2026

apache/arrow

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