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[jira] [Created] (ARROW-4096) [C++] Preserve "ordered" metadata in some special cases in dictionary unification


Wes McKinney created ARROW-4096:
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             Summary: [C++] Preserve "ordered" metadata in some special cases in dictionary unification
                 Key: ARROW-4096
                 URL: https://issues.apache.org/jira/browse/ARROW-4096
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney


In the event that all dictionaries are prefixes of a common dictionary, and all have ordered=true (note: this is not the same thing as being sorted), the resulting unified dictionary can also have ordered=true



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