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BUG: <code>.unstack(sort=False)</code> reorders columns labels without the column values

Bug

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

Status: Open.

#62816 In pandas-dev/pandas;

· aallahyar opened on Oct 24, 2025

BUG: when using id_vars in .melt(), the id_vars does not recognize the column name in a multiIndex dataframe

Bug

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

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

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

Status: Open.

#60018 In pandas-dev/pandas;

· ivan-marroquin opened on Oct 11, 2024

ENH: allow pd.merge() variables right_on and left_on to accept pd.Index() array_likes

Enhancement

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

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

Status: Open.

#58279 In pandas-dev/pandas;

· loewenm opened on Apr 16, 2024

DEPR: pd.concat special cases DatetimeIndex to sort even when sort=False

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

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

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

Sortinge.g. sort_index, sort_valuese.g. sort_index, sort_values

Status: Open.

#57335 In pandas-dev/pandas;

· lukemanley opened on Feb 10, 2024

· 

3.0

DEPR: NDFrame.drop index/columns

API - ConsistencyInternal Consistency of API/BehaviorInternal Consistency of API/Behavior

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

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

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

Status: Open.

#52467 In pandas-dev/pandas;

· jbrockmendel opened on Apr 5, 2023

BUG: column labels converted to string in merge

Bug

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

Status: Open.

#46885 In pandas-dev/pandas;

· ericman93 opened on Apr 27, 2022

DOC: Merge/join treats lists/tuples differently than other list-likes

Docs

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

Status: Open.

#44077 In pandas-dev/pandas;

· rhshadrach opened on Oct 18, 2021

BUG: cannot stack MultiIndex that contains duplicates

Bug

MultiIndex

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

Status: Open.

#43109 In pandas-dev/pandas;

· batterseapower opened on Aug 19, 2021

DOC: merge_asof accepts a vector for 'left_on' parameter (and this is great! :))

Docs

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

Status: Open.

#41628 In pandas-dev/pandas;

· yohplala opened on May 23, 2021

BUG: pivot broken on the latest version 1.1.0

Enhancement

Error ReportingIncorrect or improved errors from pandasIncorrect or improved errors from pandas

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

Status: Open.

#35785 In pandas-dev/pandas;

· WindSoilder opened on Aug 18, 2020

Joining an empty DataFrame with 'on' argument can result in an invalid DataFrame

Bug

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

Status: Open.

#26213 In pandas-dev/pandas;

· robertmollitor opened on Apr 26, 2019

wide_to_long orders the column corresponding to the j parameter inconsistently

Bug

MultiIndex

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

Status: Open.

#24831 In pandas-dev/pandas;

· timgeb opened on Jan 18, 2019