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https://issues.apache.org/jira/browse/ARROW-3735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16789684#comment-16789684
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Uwe L. Korn commented on ARROW-3735:
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This is fixed in master but I add an explicit test for it.
> [Python] Proper error handling in _ensure_type
> ----------------------------------------------
>
> Key: ARROW-3735
> URL: https://issues.apache.org/jira/browse/ARROW-3735
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Krisztian Szucs
> Assignee: Krisztian Szucs
> Priority: Major
> Fix For: 0.13.0
>
>
> We have multiple _ensure_type like functions, the in defined in array.pxi
> bypasses None which causes segfault in the following example:
> {code}
> pa.array([1, 2, 3]).cast(None)
> {code}
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