Issues

• to_script(script_type="model") silently drops notin, str_endswith and str_startswith checks

  unionai-oss/pandera#2663 · Filter by author Krushil-Dhankecha opened on Nov 11, 2026

• parse_checks writes into the live Check.statistics, so to_script() and get_dataframe_schema_statistics() change the schema they read

  unionai-oss/pandera#2661 · Filter by author Krushil-Dhankecha opened on Nov 11, 2026

• to_script emits bare inf/nan, so a schema inferred from a column with infinities writes a file that fails to import

  unionai-oss/pandera#2659 · Filter by author Krushil-Dhankecha opened on Nov 11, 2026

• Pandas Category dtypes lose their categories and ordering in to_yaml/to_json/to_script, so the reloaded schema accepts any categorical column

  unionai-oss/pandera#2657 · Filter by author DG47 opened on Nov 10, 2026

• BUG: polars backend raises InvalidOperationError for mixed int/float dtypes in Check.isin on polars 2.x

  unionai-oss/pandera#2653 · Filter by author lss680455-create opened on Nov 7, 2026

• [BUG] Polars backend: absent column with a default raises ColumnNotFoundError

  unionai-oss/pandera#2651 · Filter by author lss680455-create opened on Nov 7, 2026

• polars add_missing_columns raises AttributeError for a column with a default and no dtype

  unionai-oss/pandera#2640 · Filter by author shashank11yadav opened on Nov 3, 2026
  1

• Tuple Index name comes back as a list from from_json, so the reloaded schema rejects valid data

  unionai-oss/pandera#2639 · Filter by author shashank11yadav opened on Nov 3, 2026

• Dataframe-wide integer coercion still silently wraps overflowing values

  unionai-oss/pandera#2602 · Filter by author Kayvan-Zahiri opened on Oct 23, 2026

• Polars backend: NaN fails lt/le/in_range/isin checks even with nullable=True (pandas ignores it)

  unionai-oss/pandera#2598 · Filter by author amruthasatishkumar opened on Oct 21, 2026

• Feature request: built-in is_sorted and max_gap checks for time-ordered data

  enhancement
  unionai-oss/pandera#2575 · Filter by author yang00333 opened on Oct 16, 2026
  4

• Check.str_startswith / str_endswith strategies treat the string as a regex, so schema.example() generates invalid data

  unionai-oss/pandera#2566 · Filter by author JoeyTan21 opened on Oct 15, 2026

• Affect not just integer targets

  bug
  unionai-oss/pandera#2555 · Filter by author iMalcolmS opened on Oct 8, 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

• 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

• 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

• Drop typing_inspect in favor of typing-inspection

  enhancement
  unionai-oss/pandera#2475 · Filter by author sk- opened on Sep 7, 2026
  2

• 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

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

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