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label: label:Regression
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#49275 ·
noatamir
opened
on Oct 24, 2022
9
Issues
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label
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label
:
Regression
label: label:Regression
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Open
Closed
REGR: fix string contains/match methods with compiled regex with flags
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Strings
String extension data type and string data
String extension data type and string data
Status: Merged (completed).
pandas-dev/pandas
number 62251
#62251
In pandas-dev/pandas;
·
by
jorisvandenbossche
was closed
on Sep 5, 2025
·
2.3.3
BUG: Behavior change in pandas 3.x with <code>Series.resample</code> and <code>closed="right", how="right"</code>
Bug
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Resample
resample method
resample method
Status: Open.
#62200
In pandas-dev/pandas;
·
TomAugspurger
opened
on Aug 26, 2025
·
3.0
BUG: round on object columns no longer raises a TypeError
Bug
Numeric Operations
Arithmetic, Comparison, and Logical operations
Arithmetic, Comparison, and Logical operations
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Status: Merged (completed).
pandas-dev/pandas
number 61399
#61399
In pandas-dev/pandas;
·
by
KevsterAmp
was closed
on May 21, 2025
·
2.3
Potential regression induced by "BUG: Use large_string in string array consistently"
Arrow
pyarrow functionality
pyarrow functionality
Needs Triage
Issue that has not been reviewed by a pandas team member
Issue that has not been reviewed by a pandas team member
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Strings
String extension data type and string data
String extension data type and string data
Status: Open.
#58651
In pandas-dev/pandas;
·
DeaMariaLeon
opened
on May 9, 2024
REGR: DataFrame.transpose resulting in not contiguous data on nullable EAs
Bug
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Reshaping
Concat, Merge/Join, Stack/Unstack, Explode
Concat, Merge/Join, Stack/Unstack, Explode
Status: Merged (completed).
pandas-dev/pandas
number 57474
#57474
In pandas-dev/pandas;
·
by
rhshadrach
was closed
on Feb 18, 2024
·
2.2.1
Potential perf regressions introduced by Copy-on-Write
Copy / view semantics
Performance
Memory or execution speed performance
Memory or execution speed performance
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Status: Open.
#57431
In pandas-dev/pandas;
·
rhshadrach
opened
on Feb 15, 2024
REGR: merge with 3rd party EA's can sometimes raise ValueError
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Reshaping
Concat, Merge/Join, Stack/Unstack, Explode
Concat, Merge/Join, Stack/Unstack, Explode
Status: Merged (completed).
pandas-dev/pandas
number 57333
#57333
In pandas-dev/pandas;
·
by
lukemanley
was closed
on Feb 10, 2024
·
2.2.1
BUG: pandas 2.2.0 <code>DataFrame.groupby</code> regression when group labels of type <code>pd.Timestamp</code>
Bug
Index
Related to the Index class or subclasses
Related to the Index class or subclasses
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Timezones
Timezone data dtype
Timezone data dtype
Status: Open.
#57192
In pandas-dev/pandas;
·
maread99
opened
on Feb 1, 2024
BUG: unexpected results for <code>idxmax</code> groupby aggregation on uint column
Bug
Groupby
Reduction Operations
sum, mean, min, max, etc.
sum, mean, min, max, etc.
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Status: Closed (completed).
#57040
In pandas-dev/pandas;
·
by
stress-tess
was closed
on Jan 26, 2024
·
2.2.1
REGR/DOC: pd.concat(axis=1) should special case DatetimeIndex to sort even when sort=False
Datetime
Datetime data dtype
Datetime data dtype
Index
Related to the Index class or subclasses
Related to the Index class or subclasses
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Reshaping
Concat, Merge/Join, Stack/Unstack, Explode
Concat, Merge/Join, Stack/Unstack, Explode
Status: Closed (completed).
#57006
In pandas-dev/pandas;
·
by
torext
was closed
on Feb 9, 2024
·
2.2.1
REGR: fix roundtripping datetimes with sqlite type detection
IO SQL
to_sql, read_sql, read_sql_query
to_sql, read_sql, read_sql_query
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Status: Merged (completed).
pandas-dev/pandas
number 55690
#55690
In pandas-dev/pandas;
·
by
jorisvandenbossche
was closed
on Oct 26, 2023
·
2.1.2
TST: sort index with sliced MultiIndex
MultiIndex
Regression
Functionality that used to work in a prior pandas version
Functionality that used to work in a prior pandas version
Status: Merged (completed).
pandas-dev/pandas
number 55473
#55473
In pandas-dev/pandas;
·
by
lukemanley
was closed
on Oct 10, 2023
·
2.1.2
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