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https://issues.apache.org/jira/browse/ARROW-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17657588#comment-17657588
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Rok Mihevc commented on ARROW-554:
----------------------------------
This issue has been migrated to [issue
#16191|https://github.com/apache/arrow/issues/16191] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [C++] Implement functions to conform unequal dictionaries amongst multiple
> Arrow arrays
> ---------------------------------------------------------------------------------------
>
> Key: ARROW-554
> URL: https://issues.apache.org/jira/browse/ARROW-554
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Antoine Pitrou
> Priority: Major
> Labels: Analytics, pull-request-available
> Fix For: 0.12.0
>
> Time Spent: 8.5h
> Remaining Estimate: 0h
>
> We may wish to either
> * Conform the dictionary indices to reference a common dictionary
> * Concatenate indices into a new array with a common dictionary
> This is related to in-memory dictionary encoding, as you start with a
> partially-built dictionary and then add entries as you observe new ones in
> other dictionaries, all the while "rebasing" indices to consistently
> reference the same dictionary at the end
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