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https://issues.apache.org/jira/browse/ARROW-5343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16913761#comment-16913761
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Wes McKinney commented on ARROW-5343:
-------------------------------------

I'm also interested in incremental unification so I'll have a look at this

> [C++] Consider using Buffer for transpose maps in DictionaryType::Unify 
> instead of std::vector
> ----------------------------------------------------------------------------------------------
>
>                 Key: ARROW-5343
>                 URL: https://issues.apache.org/jira/browse/ARROW-5343
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>             Fix For: 0.15.0
>
>
> In the spirit of "track all the allocations", if dictionaries have 
> non-trivial length, we may want to account for this memory more precisely. 



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