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

["Wes McKinney (JIRA)" <ji...@apache.org>]

Wes McKinney created ARROW-554:
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             Summary: [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


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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