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https://issues.apache.org/jira/browse/ARROW-772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16900296#comment-16900296
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Benjamin Kietzman commented on ARROW-772:
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Take against UnionArrays has been resolved:
https://issues.apache.org/jira/browse/ARROW-5594
> [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
> Priority: Major
> Labels: Analytics, columnar-format-1.0
> Fix For: 1.0.0
>
>
> 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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