[jira] [Updated] (ARROW-554) [C++] Implement functions to conform unequal dictionaries amongst multiple Arrow arrays

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-554:
---------------------------------
    Labels: Analytics pull-request-available  (was: Analytics)

> [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: 0.13.0
>
>
> 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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