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https://issues.apache.org/jira/browse/ARROW-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116054#comment-17116054
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Wes McKinney commented on ARROW-1574:
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This would be a useful expansion of the functions in vector_hash.cc. We must
introduce a {{HashOptions}} to be able to supply the known dictionary when
invoking the functions
> [C++] Implement kernel function that converts a dense array to dictionary
> given known dictionary
> ------------------------------------------------------------------------------------------------
>
> Key: ARROW-1574
> URL: https://issues.apache.org/jira/browse/ARROW-1574
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Labels: Analytics
>
> This may simply be a special case of cast using a dictionary type
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