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https://issues.apache.org/jira/browse/ARROW-17018?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kouhei Sutou resolved ARROW-17018.
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Resolution: Fixed
Issue resolved by pull request 13553
[https://github.com/apache/arrow/pull/13553]
> [C++][Python] Timedelta dtype metadata base unit is globally mutated by the
> Table.to_pandas() method
> ----------------------------------------------------------------------------------------------------
>
> Key: ARROW-17018
> URL: https://issues.apache.org/jira/browse/ARROW-17018
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Python
> Affects Versions: 8.0.0
> Reporter: Phillip Cloud
> Assignee: Phillip Cloud
> Priority: Major
> Labels: pull-request-available
> Fix For: 9.0.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Here's a failing test case to demonstrate the issue:
> {code}
> def test_mutates_dtype():
> import pyarrow as pa
> expected = np.dtype('<m8')
> assert np.dtype(np.timedelta64) == expected
> df = pd.DataFrame({"a": [np.timedelta64()]})
> t = pa.Table.from_pandas(df)
> t.to_pandas()
> assert np.dtype(np.timedelta64) == expected
> {code}
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