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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