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REGR: groupby.count on string[pyarrow] returns column with string dtype instead of integer #54751

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phofl opened this issue Aug 25, 2023 · 0 comments · Fixed by #54752
Closed
3 tasks done

REGR: groupby.count on string[pyarrow] returns column with string dtype instead of integer #54751

phofl opened this issue Aug 25, 2023 · 0 comments · Fixed by #54752
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Blocker Blocking issue or pull request for an upcoming release Bug Groupby Regression Functionality that used to work in a prior pandas version
Milestone
2.1

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phofl commented Aug 25, 2023

Pandas version checks

  • I have checked that this issue has not already been reported.

  • I have confirmed this bug exists on the latest version of pandas.

  • I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

pdf = pd.DataFrame({"a": [1, 2, 3], "b": pd.Series(["a", "b", "a"], dtype="string[pyarrow]")})
pdf.groupby("a").count().dtypes

Issue Description

b    string[pyarrow]
dtype: object

this is a regression on main

Expected Behavior

b    int64
dtype: object

Installed Versions

Replace this line with the output of pd.show_versions()
@phofl phofl added Bug Groupby Regression Functionality that used to work in a prior pandas version Blocker Blocking issue or pull request for an upcoming release labels Aug 25, 2023
@phofl phofl added this to the 2.1 milestone Aug 25, 2023
@phofl phofl mentioned this issue Aug 25, 2023
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Blocker Blocking issue or pull request for an upcoming release Bug Groupby Regression Functionality that used to work in a prior pandas version
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REGR: groupby.count returning string dtype instead of numeric for string input phofl/pandas
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