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https://issues.apache.org/jira/browse/ARROW-1891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16281309#comment-16281309
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ASF GitHub Bot commented on ARROW-1891:
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wesm opened a new pull request #1399: ARROW-1891: [Python] Always use NumPy NaT
sentinels to mark nulls when converting to array
URL: https://github.com/apache/arrow/pull/1399
This code path could benefit from some refactoring, but this is enough to
get things working properly, and we can refactor later.
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> [Python] NaT date32 values are only converted to nulls if from_pandas is used
> -----------------------------------------------------------------------------
>
> Key: ARROW-1891
> URL: https://issues.apache.org/jira/browse/ARROW-1891
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Reporter: Uwe L. Korn
> Assignee: Wes McKinney
> Labels: pull-request-available
> Fix For: 0.8.0
>
>
> {code}
> np.array([None, date(2017, 4, 4)], dtype='datetime64[D]')
> pa.array(expected, from_pandas=True) -> [null, 2017-4-4]
> pa.array(expected, from_pandas=True) -> [1970-1-1, 2017-4-4]
> {code}
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