Issues

• Add DataFusion support via the narwhals backend

  unionai-oss/pandera#2536 · Filter by author s5dsn-eqee opened on Sep 30, 2026
  1

• coerce=True parses ' 1' on the pandas backend but raises on polars (same schema, different verdicts)

  unionai-oss/pandera#2531 · Filter by author ptimizeroracle opened on Sep 28, 2026

• Column(drop_invalid_rows=True) nested in DataFrameSchema is ignored by 3 backends

  unionai-oss/pandera#2529 · Filter by author feiiiiii5 opened on Sep 26, 2026
  1

• Polars schemas with parametrized dtypes (Enum, List, Datetime, ...) can't be read back from yaml/json

  unionai-oss/pandera#2522 · Filter by author aminmiral opened on Sep 24, 2026

• Schema-level dtype cannot be serialized: to_yaml raises RepresenterError, to_json raises TypeError

  unionai-oss/pandera#2511 · Filter by author owgreen-dev opened on Sep 20, 2026

• Column default is dropped by to_yaml/to_json, so add_missing_columns stops accepting frames after a round trip

  unionai-oss/pandera#2510 · Filter by author owgreen-dev opened on Sep 20, 2026

• CI: the python-3.11 macos-latest pyspark job dies with OutOfMemoryError: unable to create native thread

  unionai-oss/pandera#2509 · Filter by author Rodrigo-Palma opened on Sep 19, 2026

• Check.unique_values_eq cannot be serialized: to_yaml raises RepresenterError, to_json raises TypeError (frozenset)

  unionai-oss/pandera#2505 · Filter by author owgreen-dev opened on Sep 19, 2026
  1

• MultiIndex options (strict, ordered, coerce, unique, name) are dropped by to_yaml/to_json/to_script, so a reloaded schema enforces different constraints

  unionai-oss/pandera#2503 · Filter by author owgreen-dev opened on Sep 19, 2026

• ShapeError on polars pre-release

  bug
  unionai-oss/pandera#2482 · Filter by author MariusMerkleQC opened on Sep 10, 2026
  1

• Drop typing_inspect in favor of typing-inspection

  enhancement
  unionai-oss/pandera#2475 · Filter by author sk- opened on Sep 7, 2026
  1

• User-declared parsers are silently ignored on the polars backend

  unionai-oss/pandera#2472 · Filter by author feiiiiii5 opened on Sep 6, 2026
  2

• Feature request: support Pydantic v2-style model_config: ConfigDict in addition to nested class Config

  enhancement
  unionai-oss/pandera#2419 · Filter by author Iberlauf opened on Jul 24, 2026
  1

• Document pandera with mkdocs

  enhancement
  unionai-oss/pandera#2388 · Filter by author brynpickering opened on Jun 23, 2026

• Piggy bag snowpark dataframes

  enhancement
  unionai-oss/pandera#2386 · Filter by author RalfKow opened on Jun 22, 2026
  1

• The pyspark extra should only require pyspark, document optional support for pyspark[connect]

  enhancement
  unionai-oss/pandera#2361 · Filter by author cosmicbboy opened on Jun 7, 2026
  1

• SPARK_LOCAL_IP environment variable permanently set to 127.0.0.1 after import (regression in v0.27.0)

  bug
  unionai-oss/pandera#2344 · Filter by author mabunassar opened on May 21, 2026
  1

• Make alias selector in Field mutually exclusive with the non-alias fields.

  enhancement
  unionai-oss/pandera#2343 · Filter by author boukepostma opened on May 21, 2026
  4

• Improvements for Pandera documentation (Polars support, examples, and structure)

  docs
  unionai-oss/pandera#2337 · Filter by author Kadermiyanyedi opened on May 12, 2026
  6

• Type hint warning for Polars List/Array in Column dtype

  bug
  unionai-oss/pandera#2172 · Filter by author chapmacl opened on Nov 20, 2025
  4

• Parsers (pre-processing) do not run if validation is disabled

  question
  unionai-oss/pandera#2161 · Filter by author libklein opened on Oct 26, 2025

• Data type checks only generate failure cases when nullable is set to false (pyspark.pandas)

  bug
  unionai-oss/pandera#2150 · Filter by author kukuhsetiawan-ec opened on Oct 9, 2025
  2

• Numpy monkey patches

  bug
  unionai-oss/pandera#2134 · Filter by author StephenJamesCashen opened on Sep 10, 2025
  3

• Why is unique not stored as property in FieldInfo?

  question
  unionai-oss/pandera#2128 · Filter by author jCabala opened on Sep 1, 2025

• Regression between Pandera 0.25.0 and 0.26.0 in MultiIndex validation

  bug
  unionai-oss/pandera#2115 · Filter by author Owen-OptiGrid opened on Aug 15, 2025
  2