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 12, 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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2142 open issues indexed

[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

apache/arrow#39660 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Dataset.to_arrow() can generate invalid tables Open

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

apache/arrow#39670 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[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 · 0 reactions · 1 assignee · Indexed Sep 14, 2026
[Python] Arrow PyCapsule Protocol: standard way to get the schema of a "data" (array of stream) object? Open

Component: Python

apache/arrow#39689 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python][Gandiva] Could not create LLJIT instance: Symbols not found: [ llvm_orc_registerEHFrameSectionWrapper ] Open

Component: Gandiva Component: Python Type: bug

apache/arrow#39695 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python][S3] Segmentation fault when running multithreading in Docker Open

Component: Python Type: bug

apache/arrow#39703 · 5 comments · 3 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Conversion from numpy datetime64 array with multiple of unit (eg [10s]) gives wrong values Open

Component: Python Type: bug

apache/arrow#39756 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Float value keys written as `x` instead of `x.0` when `x` has no remainder during Hive partitioning Open

Component: Python Type: bug

apache/arrow#39763 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[Python] Write_dataset() run time does not scale linearly with dataset size Open

Component: Python Type: bug

apache/arrow#39768 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[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 · 0 reactions · 1 assignee · Indexed Sep 14, 2026
[R] Export functions for low-level pointer operations Open

Component: R Status: needs champion Type: enhancement

apache/arrow#39793 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
[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 · Indexed Sep 14, 2026
[Python] UTC Timezone Equality is case sensitive Open

Component: Python Type: bug

apache/arrow#39809 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] Expression::SimplifyWithGuarantee does not work for different integral types Open

Component: C++ Type: bug

apache/arrow#39828 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Parsing timestamp with microsecond in CSV fails even with %f Open

Component: Python Type: bug

apache/arrow#39839 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] cannot allocate memory in static TLS block exception raised when pyarrow is imported before _mysql Open

Component: Python Type: bug

apache/arrow#39854 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[C++][Parquet] Thread crash at exit in Arrow-15.0.0 dataset scan Open

Component: C++ Component: Parquet Type: bug

apache/arrow#39862 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Packaging] apt install with explicit version fails due to dependency version mismatch Open

Component: Packaging Type: bug

apache/arrow#39907 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[R][C++] "negative buffer resize" error with arrow and dplyr in R Open

Component: C++ Component: R Type: bug

apache/arrow#39912 · 22 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
[Python][dataset] Add support for python generator Open

Component: Python Type: enhancement

apache/arrow#39923 · 2 comments · 3 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Implement unification of null dictionaries Open

Component: Python Status: needs champion Type: enhancement

apache/arrow#39927 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[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

apache/arrow#39938 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Consider renaming FixedShapeTensorArray.to_numpy_ndarray to FixedShapeTensorArray.to_numpy Open

Component: Python Type: enhancement

apache/arrow#39991 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Docs] Add a doc section for tensor arrays Open

Component: Documentation Status: needs champion Type: enhancement

apache/arrow#39998 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[C++][FS] AzureFileSystem::GetFileInfo(FileSelection) doesn't always handled allow_not_found correctly Open

Component: C++ Type: bug

apache/arrow#40014 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[CI][Archery] Archery linking should also check for undefined symbols Open

Component: Archery Component: Continuous Integration Type: bug

apache/arrow#40018 · 14 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
[Python] to_table() call on dataset gets stuck and ignores timeout threshold Open

Component: Python Type: bug

apache/arrow#40019 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[C++][FS][Azure] Expose parallel transfer config options available in the Azure SDK Open

Component: C++ Type: enhancement

apache/arrow#40035 · 14 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
[R] write_parquet() a large data.table with index will make the parquet file unreadable Open

Component: Parquet Component: R Type: bug

apache/arrow#40050 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[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 · Indexed Sep 14, 2026
[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 · Indexed Sep 14, 2026
[Python] Segmentation fault when calling parquet.FileMetaData().row_group(0) Open

Component: Parquet Component: Python Type: bug

apache/arrow#40081 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] mutex lock failed: Invalid argument when importing after tink (M1, macOS 14.2.1) Open

Component: Python Type: bug

apache/arrow#40088 · 29 comments · 9 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Parquet] Expand ParquetVersion enum values Open

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

apache/arrow#40096 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] JSON Type Inference + datasets: `null` doesn't fallback to other type between dataset files Open

Component: Python Type: bug

apache/arrow#40107 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[R] Initializing an Arrow array from an R difftime or hms::hms rounds down to the nearest time unit Open

Component: R Type: bug

apache/arrow#40109 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[CI][FS][Azure] Azurite tests are flaking on `main` Open

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

apache/arrow#40121 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Incorrect conversion from datetime.datetime and datetime.time objects with non-UTC timezones Open

Component: Python Type: bug

apache/arrow#40122 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Casting an empty dictionary array loses category information Open

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

apache/arrow#40128 · 13 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
[Python] Consider splitting _lib module into several parts Open

Component: Python Status: needs champion Type: enhancement

apache/arrow#40166 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] string created by strftime can't be parsed by strptime Open

Component: C++ Component: Python Type: bug

apache/arrow#40170 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[R] Arrays containing -2147483648 are converted to NA in R Open

Component: R Type: bug

apache/arrow#40194 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Release][Ruby] Investigate why we require to install libffi manually on a new M2 to run verification Open

Component: Release Component: Ruby Type: bug

apache/arrow#40195 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[R] Caught segfault on benchmark run for TPCH query 21 (scale factor 10) Open

Component: R Type: bug

apache/arrow#40217 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] Avoid double initialisation / double finalize of Aws SDK Open

Component: C++ Type: usage

apache/arrow#40262 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Add `pyarrow.dataset.dataset` doesn't accept `RecordBatchReader` Open

Component: Python Type: bug

apache/arrow#40264 · 0 comments · 4 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] `pyarrow.fs.HadoopFileSystem` throws OSError: Unable to load libhdfs Open

Component: Python Type: bug

apache/arrow#40305 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[R] How to convert the timestamp without time zone type to the POSIXct type ideally? Open

Component: R Type: bug

apache/arrow#40309 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Creating an array from a null list scalar fails Open

Component: Python Type: bug

apache/arrow#40319 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[Python][Parquet] element_type is nullable despite being non-null Open

Component: Python Type: bug

apache/arrow#40324 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026

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