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Pull requests: pandas-dev/pandas
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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…
Backport PR #60703 on branch 2.3.x (TST(string dtype): Resolve xfails in stack_unstack) Reshaping Concat, Merge/Join, Stack/Unstack, Explode Strings String extension data type and string data Testing pandas testing functions or related to the test suite
PERF: Use shallow copies/remove unnecessary copies in reshaping Copy / view semantics Reshaping Concat, Merge/Join, Stack/Unstack, Explode
Fix stubname equal suffix in wide to long function Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#57868 by tqa236 was closed May 26, 2025 Loading…
2 of 5 tasks
PERF: Improve merge performance Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
#57559 by phofl was closed Apr 15, 2025 Loading…
5 tasks
Backport PR #57474 on branch 2.2.x (REGR: DataFrame.transpose resulting in not contiguous data on nullable EAs) Bug Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
Backport PR #57333 on branch 2.2.x (REGR: merge with 3rd party EA's can sometimes raise ValueError) Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
Backport PR #57250 on branch 2.2.x (REGR/DOC: pd.concat should special case DatetimeIndex to sort even when sort=False) Docs Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
Backport PR #57101 on branch 2.2.x (REGR: Index.join raising TypeError when joining an empty index to a mixed type index) Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
Backport PR #57089 on branch 2.2.x (BUG: wide_to_long with string columns) Reshaping Concat, Merge/Join, Stack/Unstack, Explode Strings String extension data type and string data
Backport PR #57018 on branch 2.2.x (REGR: merge_ordered with fill_method="ffill" and how="left") Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
Backport PR #56613 on branch 2.2.x (BUG: Added raising when merging datetime columns with timedelta columns) Datetime Datetime data dtype Reshaping Concat, Merge/Join, Stack/Unstack, Explode Timedelta Timedelta data type
Backport PR #53641: BUG: datetime64/timedelta64 with non-nanosecond resolution Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
pd.concat dataframes with different dateti… Non-Nano BUG: outer join on equal indexes not sorting Bug Reshaping Concat, Merge/Join, Stack/Unstack, Explode
Backport PR #55670 on branch 2.1.x (REGR: merge_asof raising TypeError for "by" with datelike dtypes) Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
Backport PR #55348 on branch 2.1.x (REGR: join segfaulting for arrow string with nulls) Reshaping Concat, Merge/Join, Stack/Unstack, Explode Strings String extension data type and string data
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