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https://issues.apache.org/jira/browse/ARROW-4095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Kornfield resolved ARROW-4095.
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Resolution: Fixed
Issue resolved by pull request 5230
[https://github.com/apache/arrow/pull/5230]
> [C++] Implement optimizations for dictionary unification where dictionaries
> are prefixes of the unified dictionary
> ------------------------------------------------------------------------------------------------------------------
>
> Key: ARROW-4095
> URL: https://issues.apache.org/jira/browse/ARROW-4095
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Assignee: Antoine Pitrou
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.15.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> In the event that the unified dictionary contains other dictionaries as
> prefixes (e.g. as the result of delta dictionaries), we can avoid memory
> allocation and index transposition.
> See discussion at
> https://github.com/apache/arrow/pull/3165#discussion_r243020982
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