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PERF: Improve performance of named aggregations with no relabling

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#63742 In pandas-dev/pandas;

· alonme opened on Jan 18, 2026

BUG: str methods fail with regex backreferences on PyArrow dtype

Bug

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

Status: Open.

#63739 In pandas-dev/pandas;

· sanrishi opened on Jan 18, 2026

BUG: sort_values fails on columns with more than 2^18 entries

Bug

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

Upstream issueIssue related to pandas dependencyIssue related to pandas dependency

Status: Open.

#63735 In pandas-dev/pandas;

· FeAx7 opened on Jan 18, 2026

·  

3.0

BUG: Inconsistent NaN detection based on Series dtype, to_numeric dtype_backend, None vs np.nan, strings in orig list

Bug

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

Status: Open.

#63732 In pandas-dev/pandas;

· B-D-T opened on Jan 18, 2026

ENH: Add high-level "themes" or "presets" to Styler API

Enhancement

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

Stylerconditional formatting using DataFrame.styleconditional formatting using DataFrame.style

Status: Open.

#63712 In pandas-dev/pandas;

· sanrishi opened on Jan 16, 2026

BLD: fix all compile warnings and re-enable -Werror on CI

BuildLibrary building on various platformsLibrary building on various platforms

Status: Open.

#63701 In pandas-dev/pandas;

· jorisvandenbossche opened on Jan 15, 2026

ENH: <code>Timestamp.round</code>: officially accept <code>Timedelta</code> arguments

Enhancement

Timestamppd.Timestamp and associated methodspd.Timestamp and associated methods

Status: Open.

#63687 In pandas-dev/pandas;

· randolf-scholz opened on Jan 14, 2026

BUG: data races when simultaneously reading data frames in multiple threads

Bug

Free Threading

Status: Open.

#63685 In pandas-dev/pandas;

· ngoldbaum opened on Jan 14, 2026

String dtype: differences in regex operations because of engine (Python vs RE2)

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

StringsString extension data type and string dataString extension data type and string data

Status: Open.

#63683 In pandas-dev/pandas;

· jorisvandenbossche opened on Jan 14, 2026

·  

3.0

DOC: Documentation unclear on how to use read_xml() with xpath parameter and a default namespace

Docs

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

Status: Open.

#63668 In pandas-dev/pandas;

· capelastegui opened on Jan 13, 2026

BUG: pd.to_numeric Segmentation fault

Bug

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

Status: Open.

#63650 In pandas-dev/pandas;

· everything411 opened on Jan 12, 2026

BUG: Missing explicit libm dependency in meson.build causes undefined symbol errors

Bug

BuildLibrary building on various platformsLibrary building on various platforms

Status: Open.

#63640 In pandas-dev/pandas;

· BwL1289 opened on Jan 11, 2026