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Posted to jira@arrow.apache.org by "David Li (Jira)" <ji...@apache.org> on 2021/09/20 15:16:00 UTC

[jira] [Created] (ARROW-14042) [C++] Improve performance on dictionaries for 'case_when' kernel

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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