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Issues list

BUG: pd.concat() cannot concatenate more than 3 mixed-frequency dataframes with multi-index series Bug Needs Discussion Requires discussion from core team before further action Period Period data type Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#59775 opened Sep 11, 2024 by sakaiando
3 tasks done
1
BUG: DataFrame.stack does not work when columns includes tuple level Bug Closing Candidate May be closeable, needs more eyeballs Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#59697 opened Sep 3, 2024 by or-jether
2 of 3 tasks
1
PERF: Melt 2x slower when future.infer_string option enabled Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode Strings String extension data type and string data
#59657 opened Aug 30, 2024 by maver1ck
3 tasks done
3
ENH: Support for semi-join on index (subsetting a multi-index dataframe with a subset of the multi-index) Closing Candidate May be closeable, needs more eyeballs Enhancement Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#58873 opened May 31, 2024 by gwerbin
1 of 3 tasks
6
BUG: pd.concat fails with large index values when using ArrowDtype Arrow pyarrow functionality Bug Dtype Conversions Unexpected or buggy dtype conversions Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#58819 opened May 24, 2024 by hombit
3 tasks done
1
PERF: future_stack=True with non-MulitIndex columns Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
#58817 opened May 24, 2024 by rhshadrach • Draft
4 of 5 tasks
3.0
1
4
BUG: pd.merge fail with numpy.uintc on Windows Bug Reshaping Concat, Merge/Join, Stack/Unstack, Explode Windows Windows OS
#58713 opened May 14, 2024 by Noname37486
2 of 3 tasks
1
2
BUG: .max() raises exception on Series with object dtype and mixture of Timestamp and NaT: TypeError: '>=' not supported between instances of 'Timestamp' and 'float' Bug Dtype Conversions Unexpected or buggy dtype conversions Reshaping Concat, Merge/Join, Stack/Unstack, Explode Timezones Timezone data dtype
#58707 opened May 13, 2024 by kerrickstaley
2 of 3 tasks
@li00-lab
3
PERF: df.unstack() is 500 times slower since pandas>=2.1 Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#58391 opened Apr 23, 2024 by sbonz
2 of 3 tasks
1
@rhshadrach
10
Fix stubname equal suffix in wide to long function Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#57868 opened Mar 16, 2024 by tqa236 Loading…
2 of 5 tasks
1
1
Deprecate accepting None in pd.concat Deprecate Functionality to remove in pandas Needs Discussion Requires discussion from core team before further action Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#57846 opened Mar 14, 2024 by twoertwein
1
3
BUG: melt no longer supports id_vars and value_vars collapsing levels accross MultiIndex Bug Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#57663 opened Feb 28, 2024 by mark-thm
3 tasks done
2.3
1
Potential regression induced by PR #57302 Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#57620 opened Feb 25, 2024 by rhshadrach 3.0
@rhshadrach
PERF: Improve merge performance Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
#57559 opened Feb 21, 2024 by phofl Loading…
5 tasks
12
DEPR: pd.concat special cases DatetimeIndex to sort even when sort=False Deprecate Functionality to remove in pandas Needs Discussion Requires discussion from core team before further action Reshaping Concat, Merge/Join, Stack/Unstack, Explode Sorting e.g. sort_index, sort_values
#57335 opened Feb 10, 2024 by lukemanley 3.0
8
BUG: pd.merge has unexpected behaviour when joining on index / column Bug Needs Triage Issue that has not been reviewed by a pandas team member Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#57291 opened Feb 7, 2024 by sledtester
2 of 3 tasks
1
@rob-sil
2
BUG: df.stack() returns wrong data when NaT is in index (regression since 2.1.0, ok in <= 2.0.3) Bug Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#57152 opened Jan 30, 2024 by behrenhoff
3 tasks done
2.3
3
BUG: Index.join preserving names incorrectly from pandas-2.x Bug Index Related to the Index class or subclasses Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#57065 opened Jan 25, 2024 by galipremsagar
2 of 3 tasks
1
2
PERF: pd.merge(on=index) is faster than pd.merge(left_index=True, right_index=True) if index is duplicated Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#56564 opened Dec 19, 2023 by starhel
3 tasks done
3
ENH: Allow to set axis name in pd.concat Enhancement Needs Discussion Requires discussion from core team before further action Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#56553 opened Dec 18, 2023 by mullimanko
1 of 3 tasks
1
BUG: left merge where right frame has different dtype key column has mismatching result dtypes compared to a "reversed" right merge Bug Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#56454 opened Dec 11, 2023 by wence-
3 tasks done
BUG: Infinite recursion with outer merge on categorical key column if left and right dtypes are mismatching non-nullable numeric kinds Bug Categorical Categorical Data Type Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#56376 opened Dec 7, 2023 by wence-
3 tasks done
1
@rob-sil
2
BUG: Merges erroneously match integer join keys between int64 and uint64 when using values >= 2**53 Bug Dtype Conversions Unexpected or buggy dtype conversions Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#56367 opened Dec 6, 2023 by wence-
3 tasks done
1
@YKim0172
2
BUG: .unstack() malfunctions for triple Indices??? Bug Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#55840 opened Nov 6, 2023 by kwhkim
3 tasks done
@kwhkim
5
BUG: pivot_table with EA dtype that cannot hold NA Bug NA - MaskedArrays Related to pd.NA and nullable extension arrays Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#55484 opened Oct 11, 2023 by jbrockmendel
ProTip! What’s not been updated in a month: updated:<2024-09-21.