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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2154 open issues indexed

[R] Update function examples to show how to open CSV dataset with partitioning and a schema Open

Component: C++ Component: R Type: task

apache/arrow#32938 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Improve error message when all values in a column are null in a parquet partition Open

Component: Python Type: enhancement

apache/arrow#32955 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Gandiva] Add token and grammar rules for literals and fields Open

Component: Gandiva Type: task

apache/arrow#32958 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Parquet] Improve parquet reading performance for String/Binary type based on Buffer operations instead of BinaryArrayBuilder Open

Component: C++ Component: Parquet Type: enhancement

apache/arrow#32970 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] write_to_parquet with s3fs will fails on no permissions for CreateBucket even when bucket exists (regression in 8.0.0) Open

Component: Python Type: bug

apache/arrow#32974 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Gandiva] Add token and grammar rules for functions Open

Component: Gandiva Type: task

apache/arrow#20413 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Gandiva] Add token and grammar rules for if and bool Open

Component: Gandiva Type: task

apache/arrow#32978 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Gandiva] Add token and grammar rules for in expression Open

Component: Gandiva Type: task

apache/arrow#32979 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Gandiva] Allow searching function signatures by name Open

Type: task

apache/arrow#20414 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Gandiva] Add type inference to Gandiva parser Open

Component: Gandiva Type: task

apache/arrow#32980 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
can't export to csv when arrow have array or json Open

apache/arrow#14152 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[C++] Add Substrait Function Tests for Filter and Join Open

Component: C++ Type: task

apache/arrow#20416 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] Switch bindings-scanner to the new scan node, remove the old scan node Open

Type: task

apache/arrow#32987 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] Support type promotion in basic evolution strategy Open

Component: C++ Type: task

apache/arrow#32988 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] Add OT spans / events to new scan node Open

Component: C++ Type: task

apache/arrow#32989 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[R] Implement dplyr::slice_sample() Open

Component: R Type: task

apache/arrow#20417 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[R] read_parquet shows misleading message about url scheme when reading from s3 failed Open

Component: R Type: task

apache/arrow#20418 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[C++] Add ordering information to exec batches Open

Component: C++ Type: enhancement

apache/arrow#32991 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
[C++] Aggregate kernel should not mandate alignment Open

Component: C++ Type: bug

apache/arrow#33010 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] Opening a dataset where partitioning variable is already in the dataset should error differently Open

Component: C++ Type: bug

apache/arrow#33011 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Reading NetCDF files using arrow in R Open

apache/arrow#14180 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] Adding Union Relation ToProto Open

Type: task

apache/arrow#33019 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Using cbind when merging multi datasets using open_dataset on a directory. Open

Type: task

apache/arrow#33021 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] pyarrow fails to write and read a dataframe with MultiIndex containing a RangeIndex with Pandas 1.5.0 Open

Component: Parquet Component: Python Type: bug

apache/arrow#33030 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
[C++] Regenerate Flatbuffers files for C++17 Open

Component: C++ Type: task

apache/arrow#33031 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Allow calling UDF kernels with field/scalar expressions Open

Component: Python Type: task

apache/arrow#33048 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Python] Large strings cause ArrowInvalid: offset overflow while concatenating arrays Open

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

apache/arrow#33049 · 24 comments · 1 reaction · 1 assignee · Indexed Sep 14, 2026
pyarrow.json.read_json ignores nullable=True on fields with non-nullable subfields in explicit_schema parse_options Open

Component: Python Type: bug

apache/arrow#33055 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] OSError: List index overflow. Open

apache/arrow#14229 · 25 comments · 4 reactions · 0 assignees · Indexed Sep 14, 2026
[python] `dtype` of `Categorical` category columns are not preserved Open

Component: Python Type: bug

apache/arrow#33070 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[Archery] C++ linting with --clang-format or archery lint --clang-tidy fails on M1 Open

Component: Archery Type: bug

apache/arrow#33089 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] Not able to build the project with the latest commit of the master branch Open

Component: C++ Type: bug

apache/arrow#33096 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[pyarrow] significant increase in memory when connect hdfs and upload files to hdfs Open

apache/arrow#14268 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++][Python] Allow an ExtensionType to register or implement custom casts Open

Component: C++ Component: Python Status: needs champion Type: enhancement

apache/arrow#33103 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
[Go][Parquet] panic: fatal error: found bad pointer in Go heap on ByteArrayColumnChunkReader.Skip Open

Type: bug

apache/arrow#33108 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
pyarrow.parquet.read_table fs (filesystem) argument does not work with fsspec.implementations.arrow.ArrowFSWrapper objects Open

Component: Parquet Component: Python Type: bug

apache/arrow#33110 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] combine_chunks on DictionaryArray appears to be broken Open

Component: C++ Component: Python Type: bug

apache/arrow#33112 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
feather.read_table 150x slower when reading columns in newer versions Open

Type: bug

apache/arrow#33123 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Allow disabling more components Open

Component: Python Type: enhancement

apache/arrow#33126 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
What purpose does ArrowRecordBatch solve? Open

apache/arrow#14303 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Use ExtensionScalar.as_py() as fallback in ExtensionArray to_pandas? Open

Component: Python Type: enhancement

apache/arrow#33134 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
SparseCOOTensor raises error when created with zero elements Open

Component: Python Type: bug

apache/arrow#33141 · 6 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
[C++] Building of Arrow C++ (dataset) errors on Windows Open

Component: C++ Type: bug

apache/arrow#33145 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Python] Coredump when joining big large_strings Open

Component: C++ Component: Python Type: bug

apache/arrow#33151 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] RandomArrayGenerator does not properly generate ListArrays with Nulls Open

Component: C++ Type: bug

apache/arrow#33164 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
NativeFile.download throws seekable error Open

Type: bug

apache/arrow#33165 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] Arrow failed to run arrow-array-test and arrow-ipc-read-write-test on release and debug configuration with MSVC on windows Open

Component: C++ Type: bug

apache/arrow#33176 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Undefined reference Open

apache/arrow#14354 · 13 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[C++] random function can't actually be used Open

Component: C++ Type: bug

apache/arrow#33181 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[Parquet][C++][Python] "List index overflow" when read parquet file Open

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

apache/arrow#33188 · 14 comments · 4 reactions · 0 assignees · Indexed Sep 14, 2026

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