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https://issues.apache.org/jira/browse/ARROW-4095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661118#comment-17661118
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Rok Mihevc commented on ARROW-4095:
-----------------------------------
This issue has been migrated to [issue
#20688|https://github.com/apache/arrow/issues/20688] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [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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