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

[Python] Consider splitting _lib module into several parts Open

Component: Python Status: needs champion Type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 45/100

apache/arrow#40166 · 11 comments · Opened Feb 20, 2024
[Python] Casting an empty dictionary array loses category information Open

Component: C++ Component: Python good-second-issue Type: bug

apache/arrow#40128 · 13 comments · 1 assignee · Opened Feb 19, 2024
[Python] Incorrect conversion from datetime.datetime and datetime.time objects with non-UTC timezones Open

Component: Python Type: bug

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

apache/arrow#40122 · 3 comments · Opened Feb 19, 2024
[CI][FS][Azure] Azurite tests are flaking on `main` Open

Component: C++ Component: Continuous Integration Type: bug

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

apache/arrow#40121 · 2 comments · Opened Feb 18, 2024
[R] Initializing an Arrow array from an R difftime or hms::hms rounds down to the nearest time unit Open

Component: R Type: bug

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

apache/arrow#40109 · 7 comments · Opened Feb 17, 2024
[Python] JSON Type Inference + datasets: `null` doesn't fallback to other type between dataset files Open

Component: Python Type: bug

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

apache/arrow#40107 · 2 comments · Opened Feb 17, 2024
[C++][Parquet] Expand ParquetVersion enum values Open

Component: C++ Component: Parquet good-first-issue Type: enhancement

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

apache/arrow#40096 · 8 comments · Opened Feb 15, 2024
[Python] mutex lock failed: Invalid argument when importing after tink (M1, macOS 14.2.1) Open

Component: Python Type: bug

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

apache/arrow#40088 · 29 comments · 9 reactions · Opened Feb 15, 2024
[Python] Segmentation fault when calling parquet.FileMetaData().row_group(0) Open

Component: Parquet Component: Python Type: bug

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

apache/arrow#40081 · 5 comments · Opened Feb 14, 2024
[R][Python] Unable to load pyarrow package through reticulate in R on windows Open

Component: Python Component: R Type: bug

apache/arrow#40073 · 8 comments · 3 reactions · 1 assignee · Opened Feb 14, 2024
[C++][Python] Conversion of RecordBatch and Table to 2D array / Tensor Open

Component: C++ Component: Python Type: enhancement

apache/arrow#40058 · 1 comment · 2 reactions · 1 assignee · Opened Feb 13, 2024
[R] write_parquet() a large data.table with index will make the parquet file unreadable Open

Component: Parquet Component: R Type: bug

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

apache/arrow#40050 · 6 comments · Opened Feb 12, 2024
[C++][FS][Azure] Expose parallel transfer config options available in the Azure SDK Open

Component: C++ Type: enhancement

apache/arrow#40035 · 14 comments · 1 assignee · Opened Feb 11, 2024
[Python] to_table() call on dataset gets stuck and ignores timeout threshold Open

Component: Python Type: bug

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

apache/arrow#40019 · 1 reaction · Opened Feb 9, 2024
[CI][Archery] Archery linking should also check for undefined symbols Open

Component: Archery Component: Continuous Integration Type: bug

apache/arrow#40018 · 14 comments · 1 assignee · Opened Feb 9, 2024
[C++][FS] AzureFileSystem::GetFileInfo(FileSelection) doesn't always handled allow_not_found correctly Open

Component: C++ Type: bug

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

apache/arrow#40014 · Opened Feb 9, 2024
[Docs] Add a doc section for tensor arrays Open

Component: Documentation Status: needs champion Type: enhancement

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

apache/arrow#39998 · 1 comment · 1 reaction · Opened Feb 8, 2024
[Python] Consider renaming FixedShapeTensorArray.to_numpy_ndarray to FixedShapeTensorArray.to_numpy Open

Component: Python Type: enhancement

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

apache/arrow#39991 · 8 comments · Opened Feb 8, 2024
[C++][Parquet] Strange behavior when null is partition value in parquet datasets with filename and directory partitioning Open

Component: C++ Component: Parquet Component: Python Type: bug

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

apache/arrow#39938 · Opened Feb 4, 2024
[Python] Implement unification of null dictionaries Open

Component: Python Status: needs champion Type: enhancement

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

apache/arrow#39927 · 10 comments · Opened Feb 2, 2024
[Python][dataset] Add support for python generator Open

Component: Python Type: enhancement

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

apache/arrow#39923 · 2 comments · 3 reactions · Opened Feb 2, 2024
[R][C++] "negative buffer resize" error with arrow and dplyr in R Open

Component: C++ Component: R Type: bug

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

apache/arrow#39912 · 22 comments · 2 reactions · Opened Feb 2, 2024
[Packaging] apt install with explicit version fails due to dependency version mismatch Open

Component: Packaging Type: bug

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

apache/arrow#39907 · 3 comments · 1 reaction · Opened Feb 2, 2024
[C++][Parquet] Thread crash at exit in Arrow-15.0.0 dataset scan Open

Component: C++ Component: Parquet Type: bug

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

apache/arrow#39862 · 4 comments · Opened Jan 31, 2024
[Python] cannot allocate memory in static TLS block exception raised when pyarrow is imported before _mysql Open

Component: Python Type: bug

Difficulty 5/5 Over a week Newbie friendliness 32/100

apache/arrow#39854 · 3 comments · 1 reaction · Opened Jan 30, 2024
[Python] Parsing timestamp with microsecond in CSV fails even with %f Open

Component: Python Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

apache/arrow#39839 · 1 comment · Opened Jan 29, 2024
[C++] Expression::SimplifyWithGuarantee does not work for different integral types Open

Component: C++ Type: bug

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

apache/arrow#39828 · Opened Jan 29, 2024
[Python] UTC Timezone Equality is case sensitive Open

Component: Python Type: bug

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

apache/arrow#39809 · 3 comments · Opened Jan 26, 2024
[Python] Dataset.to_batches accumulates memory usage and leaks Open

Component: Parquet Component: Python Type: bug

apache/arrow#39808 · 15 comments · 25 reactions · 1 assignee · Opened Jan 26, 2024
[R] Export functions for low-level pointer operations Open

Component: R Status: needs champion Type: enhancement

apache/arrow#39793 · 5 comments · 1 assignee · Opened Jan 25, 2024
[C++][Flight RPC] ServerMiddleware::SendingHeaders called before RPC handler, not "when sending headers" Open

Component: C++ Component: FlightRPC Type: bug

apache/arrow#39791 · 12 comments · 1 assignee · Opened Jan 25, 2024
[Python] Write_dataset() run time does not scale linearly with dataset size Open

Component: Python Type: bug

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

apache/arrow#39768 · Opened Jan 23, 2024
[Python] Float value keys written as `x` instead of `x.0` when `x` has no remainder during Hive partitioning Open

Component: Python Type: bug

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

apache/arrow#39763 · 1 comment · 1 reaction · Opened Jan 23, 2024
[Python] Conversion from numpy datetime64 array with multiple of unit (eg [10s]) gives wrong values Open

Component: Python Type: bug

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

apache/arrow#39756 · Opened Jan 23, 2024
[Python][S3] Segmentation fault when running multithreading in Docker Open

Component: Python Type: bug

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

apache/arrow#39703 · 5 comments · 3 reactions · Opened Jan 19, 2024
[Python][Gandiva] Could not create LLJIT instance: Symbols not found: [ llvm_orc_registerEHFrameSectionWrapper ] Open

Component: Gandiva Component: Python Type: bug

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

apache/arrow#39695 · 12 comments · Opened Jan 19, 2024
[Python] Arrow PyCapsule Protocol: standard way to get the schema of a "data" (array of stream) object? Open

Component: Python

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

apache/arrow#39689 · 9 comments · Opened Jan 18, 2024
[R] "Error: Filter expression not supported for Arrow Datasets" using "date" expression rigth hand side of a filter Open

Component: Parquet Component: R Priority: Critical Type: bug

apache/arrow#39688 · 2 comments · 1 assignee · Opened Jan 18, 2024
Dataset.to_arrow() can generate invalid tables Open

Component: C++ Component: Parquet Component: Python Type: bug

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

apache/arrow#39670 · Opened Jan 17, 2024
[R] Update the docs to show how to avoid situations like data loss with leading zero in partition column Open

Component: R good-first-issue Status: needs champion Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

apache/arrow#39660 · 6 comments · Opened Jan 17, 2024
[Release][Verification] Binary verification job verify-rc-binaries-wheels-macos-11-amd64 has been failing since 14.0.0 with a timeout Open

Component: Release Type: bug

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

apache/arrow#39659 · Opened Jan 17, 2024
C++ tests don't build due to googletest header conflict Open

Component: C++ Type: bug

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

apache/arrow#39646 · 5 comments · Opened Jan 16, 2024
[C++][Dataset] Selecting a StringView column ("project") of a Dataset crashes Open

Component: C++ Type: bug

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

apache/arrow#39639 · 1 comment · Opened Jan 16, 2024
[C++][Dataset] Filtering dataset that has column with StringView type gives empty table as result Open

Component: C++ Critical Fix Type: bug

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

apache/arrow#39637 · Opened Jan 16, 2024
[C++] Unique of StringView array incorrect with nulls Open

Component: C++ Type: bug

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

apache/arrow#39635 · Opened Jan 16, 2024
[C++] Implement basic functionality for new Binary/Utf8View types Open

Component: C++

apache/arrow#39634 · 10 comments · 1 assignee · Opened Jan 16, 2024
[C++] Segfault on `arrow::internal::SerialExecutor::RunTasksOnAllExecutors` Open

Component: C++ Type: bug

apache/arrow#39619 · 1 assignee · Opened Jan 15, 2024
[C++] CMAKE_PREFIX_PATH changes are not passed on to externalProjects Open

Component: C++ Type: bug

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

apache/arrow#39590 · 2 comments · Opened Jan 12, 2024
[R] Problem using `month()` binding on augmented column Open

Component: R Priority: Critical Type: bug

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

apache/arrow#39548 · Opened Jan 10, 2024
[C] Arrow schema checks should throw graceful errors instead of crashing from assertions Open

Component: C Type: enhancement

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

apache/arrow#39543 · 3 comments · Opened Jan 10, 2024

apache/arrow

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