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https://issues.apache.org/jira/browse/ARROW-971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276890#comment-16276890
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ASF GitHub Bot commented on ARROW-971:
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wesm commented on issue #1378: ARROW-971: [C++/Python] Implement
Array.IsValid/IsNull
URL: https://github.com/apache/arrow/pull/1378#issuecomment-348984723
Right, this computation might be a unit of work in some more general
computational pipeline, so it would be useful for this to be implemented with a
similar API to other array kernel functions
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> [C++/Python] Implement Array.isvalid/notnull/isnull
> ---------------------------------------------------
>
> Key: ARROW-971
> URL: https://issues.apache.org/jira/browse/ARROW-971
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Wes McKinney
> Assignee: Licht Takeuchi
> Labels: pull-request-available
> Fix For: 0.9.0
>
>
> For arrays with nulls, this amounts to returning the validity bitmap. Without
> nulls, an array of all 1 bits must be constructed. For isnull, the bits must
> be flipped (in this case, the un-set part of the new bitmap must stay 0,
> though).
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