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Potential perf regressions introduced by Copy-on-Write

Copy / view semantics

PerformanceMemory or execution speed performanceMemory or execution speed performance

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Status: Open.

#57431 In pandas-dev/pandas;

· rhshadrach opened on Feb 15, 2024

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

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

BUG: DataFrame.at allows adding new rows to a DataFrame

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

setitem-with-expansion

Status: Open.

#48323 In pandas-dev/pandas;

· rhshadrach opened on Aug 31, 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: Error raised accessing tuple value in Series when index contains duplicates

Bug

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

SeriesSeries data structureSeries data structure

Status: Open.

#37800 In pandas-dev/pandas;

· rhshadrach opened on Nov 12, 2020

ENH: groupby(...).agg should only accept reducers

API Design

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

Enhancement

Groupby

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

Status: Open.

#35725 In pandas-dev/pandas;

· rhshadrach opened on Aug 14, 2020