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 20h
Merged PRs (30d): 94

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

[Python] test_get_include failing in conda builds on unix Open

Component: Continuous Integration Component: Python Priority: Medium Status: needs champion Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

apache/arrow#15016 · 4 comments · Opened Dec 18, 2022
[Dev] Comment bot embeds closes comment on code block Open

Component: Developer Tools Status: needs champion Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

apache/arrow#14979 · Opened Dec 15, 2022
[C++] Rename "struct_field" kernel, or add new kernel for generic FieldRef selection in projections? Open

Component: C++

Difficulty 5/5 Over a week Newbie friendliness 30/100

apache/arrow#14971 · 2 comments · Opened Dec 15, 2022
[Python] Change StructArray.field(..) to return "flattened" field? Open

Component: Python

Difficulty 5/5 Over a week Newbie friendliness 30/100

apache/arrow#14970 · Opened Dec 15, 2022
[C++] Enable Substrait ReadRel Projection in Acero Open

Component: C++ Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow#14965 · 3 comments · Opened Dec 15, 2022
[C++][Python] Unifying differing dictionaries in Arrow compute Open

Component: Python Type: bug

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

apache/arrow#14955 · 5 comments · 1 reaction · Opened Dec 14, 2022
[C++][CMake] Use cpp/src/arrow/util/config.h.cmake instead of add_defintions() for ARROW_WITH_${COMPRESESION} Open

Component: C++ Type: enhancement

apache/arrow#14906 · 1 comment · 1 assignee · Opened Dec 9, 2022
Acero's Execution Plan never finishes. Open

Component: C++ Type: bug

apache/arrow#33593 · 3 comments · 1 assignee · Opened Dec 9, 2022
[Python] Add pyarrow.TableGroupBy.groups method Open

Component: Python Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

apache/arrow#14898 · 2 comments · Opened Dec 9, 2022
[Python] Add a pyarrow.Table.aggregate function to compute aggregates against the whole table Open

Component: Python Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

apache/arrow#14896 · 3 comments · Opened Dec 9, 2022
[Python] Is there a way to call a custom compute function on a table.group_by aggregation? Open

Component: Python Type: usage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow#14860 · 3 comments · 2 reactions · Opened Dec 6, 2022
[Python] write_dataset how to add and update data Open

Component: Parquet Component: Python Type: usage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/arrow#14834 · 5 comments · 1 reaction · Opened Dec 5, 2022
Arrow Flight Stream Writing vector Schema Root from Batches Open

Component: FlightRPC Type: usage

Difficulty 4/5 3-5 days Newbie friendliness 30/100

apache/arrow#14812 · 10 comments · Opened Dec 1, 2022
[C++] CSVBufferIterator potentially used incorrectly Open

Component: C++ Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow#14792 · 5 comments · Opened Nov 30, 2022
[Python] Fix PytestUnraisableExceptionWarning in substrait test Open

Component: Python Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

apache/arrow#14766 · 9 comments · Opened Nov 29, 2022
[Python] Mismatching schema when writing dataset Open

Component: Python Type: usage

Difficulty 3/5 1-2 days Newbie friendliness 35/100

apache/arrow#14763 · 2 comments · Opened Nov 29, 2022
[C++] "struct_field" kernel crashing when selecting a Union field and parent StructArray has a validity bitmap Open

Component: C++ good-second-issue

apache/arrow#14736 · 6 comments · 1 assignee · Opened Nov 25, 2022
[R] Filter operations not shown when called before summarise Open

Component: R Priority: Medium Status: needs champion Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

apache/arrow#14732 · 7 comments · Opened Nov 25, 2022
[Python] [Docs] Mention the C Data/Stream Interface in PyArrow Extending Open

Component: Documentation Type: task

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

apache/arrow#33567 · 1 comment · Opened Nov 24, 2022
[C++] Sporadic error in StressSourceGroupedSumStop Open

Component: C++ Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/arrow#33562 · 1 comment · Opened Nov 23, 2022
[C++] Decide on duplicate column handling in scanner, add more tests Open

Component: C++ Status: needs champion Type: task

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

apache/arrow#33552 · Opened Nov 22, 2022
[C++] Create many-column scanner microbenchmarks Open

Component: C++ Type: task

Difficulty 3/5 1-2 days Newbie friendliness 35/100

apache/arrow#33551 · Opened Nov 22, 2022
[C++] Add support for filename, file index, and batch index columns to exec plan based scanner Open

Component: C++ Type: task

apache/arrow#20509 · 1 assignee · Opened Nov 22, 2022
CompressedOutputStream can't correctly compress/write files bigger than 16 GB Open

Component: Python Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow#14699 · 1 comment · Opened Nov 22, 2022
[python] connect hdfs,got ClassNotFoundException Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

apache/arrow#14694 · Opened Nov 22, 2022
[Python] OSError: Unable to load libjvm: /usr/java/latest//lib/amd64/server/libjvm.so Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow#14686 · 10 comments · Opened Nov 21, 2022
[C++] Expose Arrow's *FromJson, Assertion and Random generator helper functions Open

Component: C++ Type: enhancement

apache/arrow#33538 · 15 comments · 1 assignee · Opened Nov 21, 2022
[Python] `ds.write_dataset` doesn't allow feather compression Open

Component: Python Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

apache/arrow#33537 · 1 reaction · Opened Nov 21, 2022
Parquet REL decoding w/IAA(Intel® In-Memory Analytics Accelerator) Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

apache/arrow#14684 · Opened Nov 21, 2022
[Python] Expose grouping segment keys to PyArrow Open

Component: Python Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/arrow#33535 · 1 comment · Opened Nov 20, 2022
[C++][Parquet] Optimize DELTA_BINARY_PACKED encoding and decoding Open

Component: C++ Component: Parquet Type: enhancement

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

apache/arrow#20505 · 1 comment · Opened Nov 18, 2022
[Go] What is the best way to handle dictionary overflow? Open

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

apache/arrow#14670 · 4 comments · Opened Nov 18, 2022
[R] Better document the CSV read/parse/convert options we can use with open_dataset() Open

Component: R Type: task

Difficulty 3/5 1-2 days Newbie friendliness 42/100

apache/arrow#33522 · Opened Nov 17, 2022
MIGRATION: Handle issues exceeding size limits Open

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

apache/arrow#14648 · 2 comments · Opened Nov 15, 2022
[C++] Remove legacy scanner code where possible Open

Component: C++ Type: enhancement

apache/arrow#33498 · 1 comment · 1 assignee · Opened Nov 15, 2022
`binary_replace_slice` should not work with `string` types Open

Component: C++ Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

apache/arrow#33490 · 1 comment · Opened Nov 14, 2022
[pyarrow] Regarding performance issue of filter operation Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow#14629 · 1 reaction · Opened Nov 14, 2022
MIGRATION: Handle Jira auto-numbered ordered list syntax Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

apache/arrow#14628 · 3 comments · Opened Nov 13, 2022
[R] "open_dataset(f) %>% filter(id %in% myvec) %>% collect" causes CPP11::unwind_execption, crashed R Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 28/100

apache/arrow#33487 · 3 comments · Opened Nov 11, 2022
[R] Issues with open_dataset() Open

Component: R Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/arrow#33486 · 4 comments · Opened Nov 11, 2022
[C++] Read list/array data from ChunkedArray with multiple chunks Open

Component: C++ Type: test

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/arrow#33481 · Opened Nov 10, 2022
[R] Test quarter-year parser with trailing zeroes in the year when values are numeric Open

Component: R Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 25/100

apache/arrow#33479 · 2 comments · Opened Nov 10, 2022
arrow dataset: how to use date.year and date.month as partitioning Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/arrow#14619 · 10 comments · 1 reaction · Opened Nov 10, 2022
[C++] Proxy memory pool crashes with Dataset scanning Open

Component: C++ Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow#33470 · Opened Nov 9, 2022
[R] Troubles with using augmented columns Open

Component: C++ Component: R Priority: Critical Priority: Medium Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

apache/arrow#33464 · 2 comments · Opened Nov 8, 2022
[C++][Python] Implement HashAggregate UDF Open

Component: C++ Component: Python Type: task

Difficulty 5/5 Over a week Newbie friendliness 20/100

apache/arrow#33457 · Opened Nov 8, 2022
[Python] Reading from hdfs using pyarrow 10.0.0 throws OSError: [Errno 22] Opening HDFS file Open

Component: Python Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

apache/arrow#33455 · 1 comment · Opened Nov 7, 2022
[R] Error when trying to write POSIXlt data to CSV Open

Component: R Priority: Critical Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

apache/arrow#33443 · 2 comments · Opened Nov 7, 2022
[C++] Add cast option to return null for values that can't convert Open

Component: C++ Component: Python Component: R Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

apache/arrow#20486 · 4 comments · 2 reactions · Opened Nov 3, 2022
[Python] pyarrow.lib.ArrowInvalid: Not a Feather V1 or Arrow IPC file Open

Component: Python Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/arrow#33412 · 8 comments · Opened Nov 2, 2022

apache/arrow

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