[jira] [Created] (ARROW-6628) [C++] Support dictionary unification on dictionaries having nulls

[Wes McKinney (Jira)]

Wes McKinney created ARROW-6628:
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             Summary: [C++] Support dictionary unification on dictionaries 
having nulls
                 Key: ARROW-6628
                 URL: https://issues.apache.org/jira/browse/ARROW-6628
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney


Follow up to ARROW-5343



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