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BUG: <code>ValueError: ndarray is not C-contiguous</code> for <code>cummax</code> on nullable dtypes

Bug

Groupby

NA - MaskedArraysRelated to pd.NA and nullable extension arraysRelated to pd.NA and nullable extension arrays

Transformationse.g. cumsum, diff, ranke.g. cumsum, diff, rank

Status: Open.

#61031 In pandas-dev/pandas;

· MarcoGorelli opened on Mar 2, 2025

BUG: groupby(group_keys=False).apply(func=transform_function) with duplicate index does not preserve original dataframe order

ApplyApply, Aggregate, Transform, MapApply, Aggregate, Transform, Map

Bug

Groupby

Status: Open.

#57906 In pandas-dev/pandas;

· sfc-gh-mvashishtha opened on Mar 18, 2024

ENH: Better documentation or default behavior for GroupBy for columns with non-sortable values

Enhancement

Groupby

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

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

Status: Open.

#57525 In pandas-dev/pandas;

· gabuzi opened on Feb 20, 2024

BUG: groupby().groups and .indices always treat as_index as True

Bug

Groupby

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

Status: Open.

#56965 In pandas-dev/pandas;

· mvashishtha opened on Jan 19, 2024

PERF: <code>agg</code> is an order of magnitude slower with <code>pyarrow</code> dtypes

Arrowpyarrow functionalitypyarrow functionality

Groupby

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#54065 In pandas-dev/pandas;

· vkhodygo opened on Jul 10, 2023

BUG: Incorrect output in groupby(...).resample(...).ohlc()

Bug

Groupby

Resampleresample methodresample method

Status: Open.

#53804 In pandas-dev/pandas;

· btodac opened on Jun 22, 2023

API: Should groupby.rolling be treated as a transform

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

Groupby

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

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#51751 In pandas-dev/pandas;

· rhshadrach opened on Mar 3, 2023

BUG: Multiples of QuarterOffset not respected by Grouper.

Bug

FrequencyDateOffsetsDateOffsets

Groupby

Status: Open.

#51563 In pandas-dev/pandas;

· aulemahal opened on Feb 22, 2023

ENH: pd.cut closed intervals

cutcut, qcutcut, qcut

Enhancement

Groupby

IntervalInterval data typeInterval data type

Status: Open.

#51534 In pandas-dev/pandas;

· Gabriel-Kissin opened on Feb 21, 2023

API: Consolidate groupby as_index and group_keys

API Design

Groupby

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

Status: Open.

#49543 In pandas-dev/pandas;

· rhshadrach opened on Nov 5, 2022

DEPR: Allowing grouping by an index label when there are duplicates

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

Groupby

Status: Open.

#49434 In pandas-dev/pandas;

· rhshadrach opened on Nov 1, 2022

API/PERF: Don't reorder categoricals when grouping by an unordered categorical and <code>sort=False</code>

CategoricalCategorical Data TypeCategorical Data Type

Groupby

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#48749 In pandas-dev/pandas;

· mroeschke opened on Sep 23, 2022