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https://issues.apache.org/jira/browse/ARROW-4097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney updated ARROW-4097:
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Fix Version/s: (was: 0.16.0)
> [C++] Add function to "conform" a dictionary array to a target new dictionary
> -----------------------------------------------------------------------------
>
> Key: ARROW-4097
> URL: https://issues.apache.org/jira/browse/ARROW-4097
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
>
> Follow up work to ARROW-554.
> Unifying multiple dictionary-encoded arrays is one use case. Another is
> rewriting a DictionaryArray to be based on another dictionary. For example,
> this would be used to implement Cast from one dictionary type to another.
> This will need to be able to insert nulls where there are values that are not
> found in the target dictionary
> see also discussion at
> https://github.com/apache/arrow/pull/3165#discussion_r243025730
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