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Pull requests: pandas-dev/pandas
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BUG: Fix sorting behavior of DataFrame.join on list arguments Bug Reshaping Concat, Merge/Join, Stack/Unstack, Explode Sorting e.g. sort_index, sort_values
PERF: Avoid deep copies when casting dtypes in merge Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
BUG: concat([ints, bools]) incorrect casting Dtype Conversions Unexpected or buggy dtype conversions Reshaping Concat, Merge/Join, Stack/Unstack, Explode
DEPR/BUG: Do not ignore sort in concat for DatetimeIndex Bug Deprecate Functionality to remove in pandas Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#62843 by rhshadrach was merged Nov 5, 2025 Loading…
1 of 5 tasks
Improve error reporting when merge validation fails Error Reporting Incorrect or improved errors from pandas Reshaping Concat, Merge/Join, Stack/Unstack, Explode
TST: Add test DataFrame.join with CategoricalIndex Needs Tests Unit test(s) needed to prevent regressions Reshaping Concat, Merge/Join, Stack/Unstack, Explode
DOC: Additional "merge_asof" Docs Explaination Docs Reshaping Concat, Merge/Join, Stack/Unstack, Explode
BUG: Do not ignore sort in concat for DatetimeIndex Datetime Datetime data dtype Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#62752 by rhshadrach was closed Oct 25, 2025 • Draft
1 of 5 tasks
BUG: fix error when unstacking with Concat, Merge/Join, Stack/Unstack, Explode
sort=False when indexes contains NA Reshaping BUG: merge with CategoricalDtype RecursionError Categorical Categorical Data Type Reshaping Concat, Merge/Join, Stack/Unstack, Explode
BUG: Fix concat dtype preservation through concat Bug Categorical Categorical Data Type Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#61893 by adrienpacifico was closed Jul 22, 2025 Loading…
2 of 5 tasks
Raise MergeError on mismatched signed/unsigned int merge keys Bug Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
#61694 by RITAMIT2023 was closed Oct 5, 2025 Loading…
ENH #61033: Add coalesce_keys option to DataFrame.join for preserving join keys Enhancement Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
#61678 by rit4rosa was closed Jul 28, 2025 Loading…
BUG: DataFrame.explode fails with str dtype Bug Reshaping Concat, Merge/Join, Stack/Unstack, Explode Strings String extension data type and string data
BUG: Fix pivot_table margins to include NaN groups when dropna=False Bug Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Reshaping Concat, Merge/Join, Stack/Unstack, Explode
BUG: Raise clear error for duplicate id_vars in melt (GH61475) Error Reporting Incorrect or improved errors from pandas Reshaping Concat, Merge/Join, Stack/Unstack, Explode
BUG: Raise TypeError when joining with non-DataFrame using 'on=' (GH#61434) Error Reporting Incorrect or improved errors from pandas Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
#61454 by iabhi4 was closed Oct 5, 2025 Loading…
4 tasks done
BUG: Raise MergeError when suffixes result in duplicate column names … Bug Reshaping Concat, Merge/Join, Stack/Unstack, Explode
BUG: Fix pyarrow categoricals not working for pivot and multiindex Arrow pyarrow functionality Reshaping Concat, Merge/Join, Stack/Unstack, Explode
DOC: Add details of dropna in DataFrame.pivot_table Docs Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Reshaping Concat, Merge/Join, Stack/Unstack, Explode
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