Issues

• [C++][FlightRPC] ipc::Message::Open reads unaligned Flatbuffers metadata in place

  Component: C++Component: FlightRPCType: bug
  apache/arrow#54916 · Filter by author Spikhalskiy opened on Oct 21, 2026
  

• [C++] ValidateFull() crashes on a union array whose type ids or offsets buffer is missing

  Component: C++
  apache/arrow#54908 · Filter by author oversk7 opened on Oct 21, 2026
  1

  

• [C++] SparseUnionArray::Make cannot build a valid array from a sliced type_ids array

  Component: C++
  apache/arrow#54907 · Filter by author oversk7 opened on Oct 21, 2026

• [C++][Compute] ascii_upper / ascii_lower / ascii_swapcase return an invalid array when the first offset is not 0

  Component: C++
  apache/arrow#54906 · Filter by author oversk7 opened on Oct 21, 2026
  1

  

• [Other] Adding more OSS-Fuzz fuzzers for the arrow project

  Component: OtherType: enhancement
  apache/arrow#54903 · Filter by author arthurscchan opened on Oct 21, 2026
  

• [C++] Move GCS and google-cloud-cpp to its own libarrow_gcs.so

  Component: C++Type: enhancement
  Feature

  apache/arrow#54902 · Filter by author raulcd opened on Oct 21, 2026
  1

  

• [C++][Python] pyarrow.Table.join() fatal crash for large_string keys near 2gb

  Component: C++Component: PythonType: bug
  apache/arrow#54885 · Filter by author stephen-a-stc opened on Oct 21, 2026
  1

• [Python][Packaging] PyArrow 26.0.0 bundled runtime DLL blocked by Smart App Control

  Component: PythonType: bug
  apache/arrow#54781 · Filter by author jameswilkinson7777 opened on Oct 20, 2026

• [CI][Docs] Pull requests closed by the PR limit workflow cannot be reopened by their authors

  Component: Continuous IntegrationComponent: Documentation
  apache/arrow#54696 · Filter by author pearu opened on Oct 20, 2026
  2

• [Ruby] Exported Arrow::TableBatchReader crashes after GC when its table is not referenced

  Component: RubyType: bug
  apache/arrow#54689 · Filter by author himotoyoshi opened on Oct 20, 2026

• [Ruby] Memory passed to Arrow::Buffer.new is freed by GC while an array still refers to it

  Component: RubyType: bug
  apache/arrow#54688 · Filter by author himotoyoshi opened on Oct 20, 2026

• [R] Attributes not preserved for list columns

  Component: RType: bug
  apache/arrow#54682 · Filter by author marberts opened on Oct 20, 2026
  1

• [C++] Implement equality comparison between Utf8View and other string types

  Component: C++Type: enhancement
  apache/arrow#54668 · Filter by author adamreeve opened on Oct 19, 2026

• [C++][Python] Use timestamp_parsers as a fallback for CSV time columns

  Component: C++Component: Python
  apache/arrow#54651 · Filter by author pearu opened on Oct 19, 2026
  

• [C++][Python] Use timestamp_parsers as a fallback for CSV date columns

  Component: C++Component: Python
  apache/arrow#54650 · Filter by author pearu opened on Oct 19, 2026
  

• [C++][FlightRPC][ODBC] Driver fails when an endpoint location is arrow-flight-reuse-connection://?

  Component: C++Component: FlightRPC
  apache/arrow#54649 · Filter by author AbhishekPathania opened on Oct 19, 2026
  

• [C++] strptime timestamp parser wraps leap seconds into the next minute

  Component: C++
  apache/arrow#54647 · Filter by author pearu opened on Oct 19, 2026
  

• [C++] strptime timestamp parser wraps years that do not fit in 16 bits

  Component: C++
  apache/arrow#54646 · Filter by author pearu opened on Oct 19, 2026
  

• [FlightRPC][CI][C++][ODBC] ODBC tests are currently failing on main with a segfault

  Component: C++Component: Continuous IntegrationComponent: FlightRPCType: bug
  apache/arrow#54638 · Filter by author raulcd opened on Oct 19, 2026
  4

  

• [Parquet][Python] pq.read_table should allow passing MemoryPool

  Component: ParquetComponent: Pythongood-first-issueType: enhancement
  apache/arrow#54637 · Filter by author pitrou opened on Oct 19, 2026
  4

• [C++][Compute] Casting an all-null list array read from IPC to fixed_size_list segfaults (Take with out-of-bounds index on an empty child)

  Type: bug
  apache/arrow#54570 · Filter by author hanke580 opened on Oct 19, 2026

• [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
  1

• [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