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https://issues.apache.org/jira/browse/ARROW-554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-554.
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Resolution: Fixed
Fix Version/s: (was: 0.13.0)
0.12.0
Issue resolved by pull request 3165
[https://github.com/apache/arrow/pull/3165]
> [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: 4h 50m
> 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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