Issues

• Scanning a registered pyarrow.RecordBatchReader buffers most of the stream when the query consumes it slowly

  duckdb/duckdb-python#691 · Filter by author max-parke-scale opened on Oct 16, 2026

• max_temp_directory_size in connect config is reported but not enforced

  duckdb/duckdb-python#667 · Filter by author simtheodyssey opened on Oct 15, 2026
  1

• Filters on Arrow tables with run-end encoded columns get pushed down and fail (some invalidate the database)

  duckdb/duckdb-python#666 · Filter by author willfrey opened on Oct 14, 2026

• Join filters get pushed into Arrow scans that can't handle them (string_view / binary_view tables)

  duckdb/duckdb-python#665 · Filter by author willfrey opened on Oct 14, 2026

• Arrow filter pushdown: comparing a dictionary-encoded binary, decimal or TIMESTAMPTZ column raises an InternalException

  duckdb/duckdb-python#664 · Filter by author willfrey opened on Oct 14, 2026

• Arrow scan: filter on a dictionary column with string_view values is pushed down and fails

  duckdb/duckdb-python#663 · Filter by author willfrey opened on Oct 14, 2026

• Publish CPython 3.15 wheels

  duckdb/duckdb-python#659 · Filter by author eavanvalkenburg opened on Oct 14, 2026

• duckdb.experimental.spark fails to import without typing_extensions, which is not a runtime dependency

  duckdb/duckdb-python#653 · Filter by author joaquinhuigomez opened on Oct 12, 2026

• DuckDB temporary files are not encrypted by default

  needs triage
  duckdb/duckdb-python#645 · Filter by author chriskillpack-argus opened on Oct 1, 2026

• Type stubs omit the connection keyword on module-level read_json and write_csv

  duckdb/duckdb-python#627 · Filter by author joaquinhuigomez opened on Sep 21, 2026
  1

• duckdb.sql() on a piped CSV silently returns wrong results; con.execute() on the same input is correct

  needs triage
  duckdb/duckdb-python#622 · Filter by author vijayvaradan opened on Sep 16, 2026

• Streaming result buffers the entire result in memory when rows contain large VARCHAR values

  needs triage
  duckdb/duckdb-python#617 · Filter by author zzl221000 opened on Sep 11, 2026
  2

• Access violation (0xC0000005) in _duckdb.cp313-win_amd64.pyd during concurrent read-only queries; same defect on 1.4.4 and 1.5.5, two WER buckets; asking for symbolication of three offsets

  duckdb/duckdb-python#613 · Filter by author MiamiPavel opened on Sep 6, 2026
  1

• Translate unsupported fsspec modification times into a typed DuckDB error

  duckdb/duckdb-python#584 · Filter by author u70b3 opened on Aug 13, 2026
  2

• Failure to collect operations that join two lazily retrieved Polars lazyframes

  needs triage
  duckdb/duckdb-python#583 · Filter by author ak-gupta opened on Aug 12, 2026

• read_json accepts a list of paths at runtime but the type stub only allows a single path.

  needs triage
  duckdb/duckdb-python#576 · Filter by author Amir-R25 opened on Jul 31, 2026
  3

• TIMESTAMPTZ → Python conversion (fetchone/.df()/.arrow()) returns wrong DST offset for dates from 2038 onward (pytz Year 2038 bug)

  needs triage
  duckdb/duckdb-python#579 · Filter by author data-gym opened on Jul 28, 2026
  1

• UHUGEINT values>= 2^127 return negative w/ to_arrow_table

  needs triage
  duckdb/duckdb-python#568 · Filter by author paultiq opened on Jul 27, 2026

• surprising fetchall return value on some queries, since 1.5.2

  needs triage
  duckdb/duckdb-python#535 · Filter by author shahin opened on Jul 4, 2026

• Possible reference leak of the argument tuple in FunctionCall()

  needs triage
  duckdb/duckdb-python#534 · Filter by author K-ANOY opened on Jul 4, 2026

• Crash when terminating process if Py_Finalize isn't called

  needs triage
  duckdb/duckdb-python#531 · Filter by author tonyroberts opened on Jul 3, 2026
  1

• Lifecycle problem with UDF functions

  needs triage
  duckdb/duckdb-python#530 · Filter by author extremeCrazyCoder opened on Jul 3, 2026

• Surface engine WARNING-level log messages in the Python client (parity with the CLI)

  duckdb/duckdb-python#480 · Filter by author rustyconover opened on Jun 5, 2026

• read_csv from filehandle, when turned into a view, stops working with No files found that match the pattern "DUCKDB_INTERNAL_OBJECTSTORE://...

  needs triage
  duckdb/duckdb-python#477 · Filter by author nickzoic opened on Jun 1, 2026

• Pushdown Filter Type BLOOM_FILTER is not currently supported in PyArrow Scans

  needs more info
  duckdb/duckdb-python#463 · Filter by author jakkes opened on May 18, 2026
  3