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https://issues.apache.org/jira/browse/ARROW-772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351591#comment-16351591
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Wes McKinney commented on ARROW-772:
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{{UnaryKernel}} is a convenience for functions of one argument. I am not sure
what will be the right structure long term, but for the moment I believe it
should be to pass the arguments as a {{Datum}} with the {{COLLECTION}} type
(possibly to be renamed later to "SEQUENCE")
https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/kernel.h#L53
> [C++] Implement take kernel functions
> -------------------------------------
>
> Key: ARROW-772
> URL: https://issues.apache.org/jira/browse/ARROW-772
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Jingyuan Wang
> Priority: Major
> Labels: Analytics
> Fix For: 0.9.0
>
>
> Among other things, this can be used to convert from DictionaryArray back to
> dense array. This is equivalent to {{ndarray.take}} in NumPy
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