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https://issues.apache.org/jira/browse/ARROW-6704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ARROW-6704:
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Labels: pull-request-available (was: )
> [C++] Cast from timestamp to higher resolution does not check out of bounds
> timestamps
> --------------------------------------------------------------------------------------
>
> Key: ARROW-6704
> URL: https://issues.apache.org/jira/browse/ARROW-6704
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Joris Van den Bossche
> Priority: Major
> Labels: pull-request-available
>
> When casting eg {{timestamp('s')}} to {{timestamp('ns')}}, we do not check
> for out of bounds timestamps, giving "garbage" timestamps in the result:
> {code}
> In [74]: a_np = np.array(["2012-01-01", "2412-01-01"], dtype="datetime64[s]")
>
>
> In [75]: arr = pa.array(a_np)
>
>
> In [76]: arr
>
>
> Out[76]:
> <pyarrow.lib.TimestampArray object at 0x7f3d1f07cb88>
> [
> 2012-01-01 00:00:00,
> 2412-01-01 00:00:00
> ]
> In [77]: arr.cast(pa.timestamp('ns'))
>
>
> Out[77]:
> <pyarrow.lib.TimestampArray object at 0x7f3d1f07cfa8>
> [
> 2012-01-01 00:00:00.000000000,
> 1827-06-13 00:25:26.290448384
> ]
> {code}
> Now, this is the same behaviour as numpy, so not sure we should do this.
> However, since we have a {{safe=True/False}}, I would expect that for
> {{safe=True}} we check this and for {{safe=False}} we do not check this.
> (numpy has a similiar {{casting='safe'}} but also does not raise an error in
> that case).
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