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https://issues.apache.org/jira/browse/ARROW-971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16250018#comment-16250018
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Wes McKinney commented on ARROW-971:
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The desired scope for this JIRA was to be like {{pandas.isnull}} or
{{pandas.notnull}}, so returning a {{pyarrow.BooleanArray}} result
> [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
> 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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