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REGR: DataFrame.update emits spurious warning about downcasting

Bug

ConditionalsE.g. where, mask, case_whenE.g. where, mask, case_when

DataFrameDataFrame data structureDataFrame data structure

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

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

WarningsWarnings that appear or should be added to pandasWarnings that appear or should be added to pandas

Status: Merged (completed).

pandas-dev/pandasnumber 57485

#57485 In pandas-dev/pandas;

· by rhshadrach was closed on Feb 18, 2024

· 

2.2.1

Backport PR #55473: TST: sort index with sliced MultiIndex

MultiIndex

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

Status: Merged (completed).

pandas-dev/pandasnumber 55482

#55482 In pandas-dev/pandas;

· by lukemanley was closed on Oct 19, 2023

· 

2.1.2

REGR: sort index with sliced MultiIndex

MultiIndex

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

Status: Merged (completed).

pandas-dev/pandasnumber 55474

#55474 In pandas-dev/pandas;

· by lukemanley was closed on Oct 18, 2023

· 

2.1.2

REGR: NumPy func warning when dropping nuisance in agg, apply, transform

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

Nuisance ColumnsIdentifying/Dropping nuisance columns in reductions, groupby.add, DataFrame.applyIdentifying/Dropping nuisance columns in reductions, groupby.add, DataFrame.apply

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

WarningsWarnings that appear or should be added to pandasWarnings that appear or should be added to pandas

Status: Merged (completed).

pandas-dev/pandasnumber 50627

#50627 In pandas-dev/pandas;

· by rhshadrach was closed on Jan 16, 2023

· 

1.5.3

Backport PR #47550 on branch 1.4.x (REGR: fix eval with inplace=True to correctly update column values inplace)

expressionspd.eval, querypd.eval, query

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

Status: Merged (completed).

pandas-dev/pandasnumber 48151

#48151 In pandas-dev/pandas;

· by phofl was closed on Aug 19, 2022

· 

1.4.4

Backport PR #47581 on branch 1.4.x (BUG: DataFrame.loc not aligning rhs df for single block case)

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

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

Status: Merged (completed).

pandas-dev/pandasnumber 47984

#47984 In pandas-dev/pandas;

· by phofl was closed on Aug 8, 2022

· 

1.4.4

BUG: Fix nanosecond timedeltas

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

TimedeltaTimedelta data typeTimedelta data type

Status: Merged (completed).

pandas-dev/pandasnumber 45108

#45108 In pandas-dev/pandas;

· by deponovo was closed on Dec 31, 2021

· 

1.4

Fixed regression in Series.duplicated for categorical dtype with bool categories

CategoricalCategorical Data TypeCategorical Data Type

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

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

Status: Merged (completed).

pandas-dev/pandasnumber 44356

#44356 In pandas-dev/pandas;

· by phofl was closed on Nov 12, 2021

· 

1.3.5

REGR: RollingGroupby.corr producing incorrect results

Bug

Groupby

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

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Merged (completed).

pandas-dev/pandasnumber 43854

#43854 In pandas-dev/pandas;

· by rhshadrach was closed on Oct 3, 2021

· 

1.3.4

BUG: REGR: read_csv with memory_map=True raises UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc4 in position 262143: unexpected end of data

IO CSVread_csv, to_csvread_csv, to_csv

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

Status: Merged (completed).

pandas-dev/pandasnumber 43647

#43647 In pandas-dev/pandas;

· by michal-gh was closed on Sep 21, 2021

· 

1.3.4

PERF: groupby with string dtype

Groupby

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

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

Status: Merged (completed).

pandas-dev/pandasnumber 43634

#43634 In pandas-dev/pandas;

· by debnathshoham was closed on Sep 23, 2021

· 

1.3.4

REGR: fillna on f32 column raising for f64

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

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

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

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

Status: Merged (completed).

pandas-dev/pandasnumber 43455

#43455 In pandas-dev/pandas;

· by mzeitlin11 was closed on Sep 9, 2021

· 

1.3.3