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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