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https://issues.apache.org/jira/browse/ARROW-2240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16385794#comment-16385794
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ASF GitHub Bot commented on ARROW-2240:
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xhochy commented on issue #1686: ARROW-2240: [Python] Array initialization with
leading numpy nan fails with exception
URL: https://github.com/apache/arrow/pull/1686#issuecomment-370346637
Although `np.nan` is actually a float value, it is used at various places to
represent null entries in arrays that don't have a nullability mask.
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> [Python] Array initialization with leading numpy nan fails with exception
> -------------------------------------------------------------------------
>
> Key: ARROW-2240
> URL: https://issues.apache.org/jira/browse/ARROW-2240
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.8.0
> Reporter: Florian Jetter
> Priority: Minor
> Labels: pull-request-available
>
>
> Arrow initialization fails for string arrays with leading numpy NAN
> {code:java}
> import pyarrow as pa
> import numpy as np
> pa.array([np.nan, 'str'])
> # Py3: ArrowException: Unknown error: must be real number, not str
> # Py2: ArrowException: Unknown error: a float is required{code}
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