David Li created ARROW-14042:
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Summary: [C++] Improve performance on dictionaries for 'case_when'
kernel
Key: ARROW-14042
URL: https://issues.apache.org/jira/browse/ARROW-14042
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: David Li
[https://github.com/apache/arrow/pull/11022#discussion_r712162040]
If we change the dictionary builders to allow separately encoding a new value
(and getting back and index) and appending a dictionary item index, we could
avoid re-encoding the same values over and over.
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