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BUG(pandas 3.0 regression): <code>drop(index=...)</code> doesn't accept NA values when using arrow dtype in index

Arrowpyarrow functionalitypyarrow functionality

Bug

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Status: Open.

#63304 In pandas-dev/pandas;

· tswast opened on Dec 8, 2025

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3.0

BUG: Adding pyarrow column to missing column changes to NaN in DataFrame addition

Arrowpyarrow functionalitypyarrow functionality

Bug

Numeric OperationsArithmetic, Comparison, and Logical operationsArithmetic, Comparison, and Logical operations

Status: Open.

#63288 In pandas-dev/pandas;

· mattharrison opened on Dec 6, 2025

BUG: <code>.dt.seconds</code> Discrepancy Between NumPy and PyArrow Timedelta Dtypes

Arrowpyarrow functionalitypyarrow functionality

Bug

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

TimedeltaTimedelta data typeTimedelta data type

Status: Open.

#63283 In pandas-dev/pandas;

· mattharrison opened on Dec 6, 2025

·  

3.0

BUG: PyArrow string: list indexing and negative indices fail after str.split()

Arrowpyarrow functionalitypyarrow functionality

Bug

Nested DataData where the values are collections (lists, sets, dicts, objects, etc.).Data where the values are collections (lists, sets, dicts, objects, etc.).

Status: Open.

#63221 In pandas-dev/pandas;

· Elliottt-Chen opened on Nov 27, 2025

BUG: Arrow duration reduction consistency

Arrowpyarrow functionalitypyarrow functionality

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Status: Open.

#63170 In pandas-dev/pandas;

· rhshadrach opened on Nov 21, 2025

BUG: pd.read_parquet raises exception filtering on Period type columns

Arrowpyarrow functionalitypyarrow functionality

Bug

IO Parquetparquet, featherparquet, feather

Status: Open.

#62769 In pandas-dev/pandas;

· spillz opened on Oct 20, 2025

BUG: read_csv with pyarrow engine cannot handle single-line CSV files

Arrowpyarrow functionalitypyarrow functionality

Bug

IO CSVread_csv, to_csvread_csv, to_csv

Status: Open.

#62635 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 9, 2025

BUG: <code>np.isnan</code> raises on pyarrow dtypes

Arrowpyarrow functionalitypyarrow functionality

Bug

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#62506 In pandas-dev/pandas;

· MarcoGorelli opened on Sep 29, 2025

BUG: _get_common_dtype with date32[pyarrow] and null[pyarrow]

Arrowpyarrow functionalitypyarrow functionality

Bug

datetime.datestdlib datetime.date supportstdlib datetime.date support

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

Status: Open.

#62343 In pandas-dev/pandas;

· jbrockmendel opened on Sep 15, 2025

ENH: Add arrow engine to to_csv

Arrowpyarrow functionalitypyarrow functionality

Enhancement

IO CSVread_csv, to_csvread_csv, to_csv

PerformanceMemory or execution speed performanceMemory or execution speed performance

Stale

Status: Open (in progress).

pandas-dev/pandasnumber 62267

#62267 In pandas-dev/pandas;

· swt2c opened on Sep 5, 2025

PARTIAL FIX: Improve leading zeros preservation with dtype=str for dict-based dtypes

Arrowpyarrow functionalitypyarrow functionality

Bug

IO CSVread_csv, to_csvread_csv, to_csv

Stale

Status: Open (in progress).

pandas-dev/pandasnumber 62242

#62242 In pandas-dev/pandas;

· dxdc opened on Sep 2, 2025

BUG: ArrowEA.astype to categorical returning all-NaT

Arrowpyarrow functionalitypyarrow functionality

Bug

CategoricalCategorical Data TypeCategorical Data Type

datetime.datestdlib datetime.date supportstdlib datetime.date support

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Status: Open.

#62051 In pandas-dev/pandas;

· jbrockmendel opened on Aug 5, 2025