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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