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BUG: category index levels casted to non-category dtype in merge

Bug

CategoricalCategorical Data TypeCategorical Data Type

Needs TestsUnit test(s) needed to prevent regressionsUnit test(s) needed to prevent regressions

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

Status: Open.

#37480 In pandas-dev/pandas;

· hliatrussellinvestments opened on Oct 29, 2020

BUG: ValueError: The name None occurs multiple times, use a level number

Bug

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

Status: Open.

#37246 In pandas-dev/pandas;

· jcunhafonte opened on Oct 19, 2020

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

QST: Subclassing and concat

Enhancement

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

SubclassingSubclassing pandas objectsSubclassing pandas objects

Status: Open.

#35415 In pandas-dev/pandas;

· EmilianoJordan opened on Jul 26, 2020

BUG: concat along the index (axis=0) of two dataframes with duplicate column name fails

Bug

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

Status: Open.

#35240 In pandas-dev/pandas;

· ghost opened on Jul 11, 2020

Infer dtype when using <code>df.explode()</code>ENH:

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

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Enhancement

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

Status: Open.

#34923 In pandas-dev/pandas;

· hamzahiqb opened on Jun 21, 2020

BUG: pd.concat(..., copy=False) still causes copy on block consolidation.

Bug

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

Status: Open.

#34825 In pandas-dev/pandas;

· DamianBarabonkovQC opened on Jun 16, 2020

ENH: Allow join based on conditional statement

Enhancement

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

Status: Open.

#34543 In pandas-dev/pandas;

· wpdonders opened on Jun 3, 2020

API: expected result of concat of SparseArray with Categorical?

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

CategoricalCategorical Data TypeCategorical Data Type

Enhancement

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

SparseSparse Data TypeSparse Data Type

Status: Open.

#34459 In pandas-dev/pandas;

· jorisvandenbossche opened on May 29, 2020

DOC:/USAGE: Resulting Index when merging over indices

Docs

MultiIndex

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

Status: Open.

#34412 In pandas-dev/pandas;

· phofl opened on May 27, 2020

BUG: merge drops index components sometimes, when join is empty

Bug

MultiIndex

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

Status: Open.

#34357 In pandas-dev/pandas;

· phofl opened on May 24, 2020

DEPR: pd.wide_to_long

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.

#34314 In pandas-dev/pandas;

· simonjayhawkins opened on May 22, 2020