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[jira] [Created] (ARROW-4097) [C++] Add function to "conform" a dictionary array to a target new dictionary


Wes McKinney created ARROW-4097:
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             Summary: [C++] Add function to "conform" a dictionary array to a target new dictionary
                 Key: ARROW-4097
                 URL: https://issues.apache.org/jira/browse/ARROW-4097
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.13.0


Follow up work to ARROW-554. 

Unifying multiple dictionary-encoded arrays is one use case. Another is rewriting a DictionaryArray to be based on another dictionary. For example, this would be used to implement Cast from one dictionary type to another.

This will need to be able to insert nulls where there are values that are not found in the target dictionary

see also discussion at https://github.com/apache/arrow/pull/3165#discussion_r243025730



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