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Closed Mar 31, 2026
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•Closed on-merge: backport to 3.0.x
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BUG: DataFrame.sum() crashes on empty DataFrame with string + numeric columns
RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas versionStringsString extension data type and string dataString extension data type and string dataStatus: Closed (completed).#64657 In pandas-dev/pandas;BUG: Different result from str.find depending on dtype
Arrowpyarrow functionalitypyarrow functionalityStringsString extension data type and string dataString extension data type and string dataStatus: Closed (completed).#64123 In pandas-dev/pandas;Not needed RuntimeWarning in to_datetime from dataframe with missing values
DatetimeDatetime data dtypeDatetime data dtypeWarningsWarnings that appear or should be added to pandasWarnings that appear or should be added to pandasStatus: Closed (completed).#64141 In pandas-dev/pandas;BUG: to_hdf on dataframe with string column failing with compression
IO HDF5read_hdf, HDFStoreread_hdf, HDFStoreStringsString extension data type and string dataString extension data type and string dataStatus: Closed (completed).#64180 In pandas-dev/pandas;BUG: normalize_json no longer supports top-level missing entries
IO JSONread_json, to_json, json_normalizeread_json, to_json, json_normalizeStatus: Closed (completed).#64188 In pandas-dev/pandas;REGR: groupby.transform with a UDF performance
Closing CandidateMay be closeable, needs more eyeballsMay be closeable, needs more eyeballsPerformanceMemory or execution speed performanceMemory or execution speed performanceRegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas versionTransformationse.g. cumsum, diff, ranke.g. cumsum, diff, rankStatus: Closed (completed).#55256 In pandas-dev/pandas;BUG: str.find returns byte offset instead of character offset with str dtype
Arrowpyarrow functionalitypyarrow functionalityStringsString extension data type and string dataString extension data type and string dataStatus: Merged (completed).pandas-dev/pandasnumber 64133#64133 In pandas-dev/pandas;CI: Fix regex in docbuild-and-upload.yml
CIContinuous IntegrationContinuous IntegrationStatus: Merged (completed).pandas-dev/pandasnumber 64211#64211 In pandas-dev/pandas;Backport PR #64211 on branch 3.0.x (CI: Fix regex in docbuild-and-upload.yml)
CIContinuous IntegrationContinuous IntegrationStatus: Merged (completed).pandas-dev/pandasnumber 64216#64216 In pandas-dev/pandas;- Status: Merged (completed).pandas-dev/pandasnumber 64220#64220 In pandas-dev/pandas;
- Status: Merged (completed).pandas-dev/pandasnumber 64222#64222 In pandas-dev/pandas;
CI: Use scientific-python/upload-nightly-action for nightly wheels
BuildLibrary building on various platformsLibrary building on various platformsCIContinuous IntegrationContinuous IntegrationStatus: Merged (completed).pandas-dev/pandasnumber 64218#64218 In pandas-dev/pandas;Backport PR #64218 on branch 3.0.x (CI: Use scientific-python/upload-nightly-action for nightly wheels)
BuildLibrary building on various platformsLibrary building on various platformsCIContinuous IntegrationContinuous IntegrationStatus: Merged (completed).pandas-dev/pandasnumber 64243#64243 In pandas-dev/pandas;- Status: Closed (completed).#64223 In pandas-dev/pandas;
BUG: Error message when using pd.col() and power operator ** in new expression syntax
expressionspd.eval, query, pd.colpd.eval, query, pd.colStatus: Closed (completed).#64267 In pandas-dev/pandas;BUG: Support for Expressions with dunders
expressionspd.eval, query, pd.colpd.eval, query, pd.colStatus: Merged (completed).pandas-dev/pandasnumber 64270#64270 In pandas-dev/pandas;Backport PR #64270 on branch 3.0.x (BUG: Support for Expressions with dunders)
expressionspd.eval, query, pd.colpd.eval, query, pd.colStatus: Merged (completed).pandas-dev/pandasnumber 64287#64287 In pandas-dev/pandas;BUG: Assigning pd.NA to StringDtype column causes "Unknown error: Wrapping .. failed" after pd.concat with PyArrow
Arrowpyarrow functionalitypyarrow functionalityStringsString extension data type and string dataString extension data type and string dataStatus: Closed (completed).#64320 In pandas-dev/pandas;BUG: Regression with interpolate: "ValueError: window shape cannot be larger than input array shape"
Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolateRegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas versionStatus: Closed (completed).#64322 In pandas-dev/pandas;BUG: Regression with interpolate: "ValueError: window shape cannot be larger than input array shape"
Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolateRegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas versionStatus: Merged (completed).BUG: HDFStore.select(where=...) silently returns empty DataFrame with datetime64[us] index
IO HDF5read_hdf, HDFStoreread_hdf, HDFStoreNon-Nanodatetime64/timedelta64 with non-nanosecond resolutiondatetime64/timedelta64 with non-nanosecond resolutionRegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas versionStatus: Closed (completed).#64310 In pandas-dev/pandas;BUG: HDFStore.select(where=...) silently returns empty DataFrame with datetime64[us] index
IO HDF5read_hdf, HDFStoreread_hdf, HDFStoreNon-Nanodatetime64/timedelta64 with non-nanosecond resolutiondatetime64/timedelta64 with non-nanosecond resolutionRegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas versionStatus: Merged (completed).Backport PR #64318 on branch 3.0.x (BUG: HDFStore.select(where=...) silently returns empty DataFrame with datetime64[us] index)
IO HDF5read_hdf, HDFStoreread_hdf, HDFStoreNon-Nanodatetime64/timedelta64 with non-nanosecond resolutiondatetime64/timedelta64 with non-nanosecond resolutionRegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas versionStatus: Merged (completed).pandas-dev/pandasnumber 64338#64338 In pandas-dev/pandas;Bump actions/download-artifact from 7 to 8
BuildLibrary building on various platformsLibrary building on various platformsCIContinuous IntegrationContinuous IntegrationDependenciesRequired and optional dependenciesRequired and optional dependenciesStatus: Merged (completed).Bump actions/upload-artifact from 6 to 7
BuildLibrary building on various platformsLibrary building on various platformsCIContinuous IntegrationContinuous IntegrationDependenciesRequired and optional dependenciesRequired and optional dependenciesStatus: Merged (completed).