Issues

• [Python] Process aborts at interpreter exit: ~PyReadableFile takes the GIL on a ThreadPool worker during finalization (pd.read_parquet on a local path)

  Component: Python
  apache/arrow#54536 · Filter by author yo-han opened on Oct 18, 2026

• [C++][Python] CSV writer writes a null of a one-column table as an empty line, which read_csv skips by default, so null rows are lost on a round trip

  Type: bug
  apache/arrow#54535 · Filter by author hanke580 opened on Oct 18, 2026

• [C++] Casting a zoned timestamp to string (and the CSV writer) truncates UTC offsets that have seconds, so the written instant is wrong

  Type: bug
  apache/arrow#54534 · Filter by author hanke580 opened on Oct 18, 2026

• [C++][Parquet] Writer emits an empty first data page for a repeated column when data_page_size is small, and the reader then drops the row group's rows

  Type: bug
  apache/arrow#54533 · Filter by author hanke580 opened on Oct 18, 2026

• [CI][Integration] conda-integration fails to install jpype1 with Python 3.15

  Component: Continuous IntegrationComponent: IntegrationType: bug
  apache/arrow#54489 · Filter by author CurtHagenlocher opened on Oct 18, 2026
  

• [C++] Out-of-range decimal scales index the powers-of-ten tables out of bounds in truncating casts, product and Decimal::ToReal/FromReal

  Component: C++
  apache/arrow#54307 · Filter by author mardgez13 opened on Oct 18, 2026
  

• [C++][Parquet] StreamReader and StreamWriter do not check that the schema is flat

  Component: C++Component: Parquet
  apache/arrow#54305 · Filter by author mardgez13 opened on Oct 18, 2026
  

• [C++] Incorrect comparison logic for sliced DictionaryArrays

  Component: C++Type: bug
  apache/arrow#54026 · Filter by author andishgar opened on Oct 17, 2026
  3

• [C++][Engine] Out-of-bounds read on invalid Substrait emit output_mapping index

  Component: C++
  apache/arrow#54025 · Filter by author Nayana-Naik73 opened on Oct 17, 2026
  

• [C++] Building Arrow via FetchContent can fail with versions older than CMake 3.30

  Component: C++Type: bug
  apache/arrow#53995 · Filter by author raulcd opened on Oct 16, 2026
  2

• [Python][Parquet] Expose low-level page reader in pyarrow.parquet

  Component: ParquetComponent: PythonType: enhancement
  apache/arrow#53993 · Filter by author JigaoLuo opened on Oct 16, 2026

• [Python] Numpy constraint is present in the build but not in the runtime constraints

  Component: PythonType: bug
  apache/arrow#53954 · Filter by author oliversheridanmethven opened on Oct 16, 2026
  1

• [R] ExtensionType$new() crashes on non-R extension types such as arrow.opaque

  Component: R
  apache/arrow#53951 · Filter by author pedrobtz opened on Oct 16, 2026
  1

  

• [C++] std::bit_width in ALP compression fails to compile with CRAN's macOS 11.3 SDK

  Component: C++Type: bug
  apache/arrow#53945 · Filter by author thisisnic opened on Oct 15, 2026
  

• [Format][FlightSQL] Advertise supported Substrait dialect via SqlInfo / GetInfo

  Component: FormatType: enhancement
  apache/arrow#53872 · Filter by author tokoko opened on Oct 15, 2026
  

• [C++][Gandiva] Modernize AES functions: add CBC and authenticated GCM modes via ENCRYPT/DECRYPT

  Type: enhancement
  apache/arrow#53776 · Filter by author dmitry-chirkov-dremio opened on Oct 14, 2026
  1

  

• [C++] Remove an unnecessary null pointer check

  Component: C++Type: enhancement
  apache/arrow#53730 · Filter by author elfring opened on Oct 14, 2026

• [Python][Parquet] Writing a sparse union column raises ArrowNotImplementedError

  Component: ParquetComponent: Python
  apache/arrow#53595 · Filter by author willfrey opened on Oct 13, 2026

• [Python] String array buffer factories reject valid 64-bit counters

  Component: Python
  apache/arrow#53519 · Filter by author Mola-maker opened on Oct 13, 2026
  

• [Python][Parquet] Comparing metadata or schemas with None can crash Python

  Component: ParquetComponent: Python
  apache/arrow#53500 · Filter by author Mola-maker opened on Oct 13, 2026
  

• [C++][Python] CSV: option to pad short rows with nulls instead of failing

  Component: C++Component: PythonType: enhancement
  apache/arrow#53290 · Filter by author djouallah opened on Oct 12, 2026
  2

• [C++][Python] Safe decimal narrowing to Decimal32 drops coefficient bits before checking

  Component: C++Type: bug
  apache/arrow#53288 · Filter by author vera-rubin opened on Oct 11, 2026
  1

  

• [C++][Compute] Cache substring and regex matchers across invocations in scalar string kernels

  Component: C++Type: enhancement
  apache/arrow#53159 · Filter by author ishaaaan17 opened on Oct 11, 2026
  

• [R][Parquet] ParquetReaderProperties does not expose page_checksum_verification, so a corrupt page CRC reads silently

  Component: Rgood-first-issueType: enhancement
  apache/arrow#53138 · Filter by author scttfrdmn opened on Oct 10, 2026
  2

• [Parquet][Python][Dataset] Mixed FileInfo and path sources can crash Python in dataset()

  Component: ParquetComponent: PythonType: bug
  apache/arrow#53033 · Filter by author Mohit-25-tech opened on Oct 10, 2026
  1