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[jira] [Created] (ARROW-4095) [C++] Implement optimizations for dictionary unification where dictionaries are prefixes of the unified dictionary


Wes McKinney created ARROW-4095:
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             Summary: [C++] Implement optimizations for dictionary unification where dictionaries are prefixes of the unified dictionary
                 Key: ARROW-4095
                 URL: https://issues.apache.org/jira/browse/ARROW-4095
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.13.0


In the event that the unified dictionary contains other dictionaries as prefixes (e.g. as the result of delta dictionaries), we can avoid memory allocation and index transposition.

See discussion at 

https://github.com/apache/arrow/pull/3165#discussion_r243020982



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