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Posted to jira@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2020/11/23 13:21:00 UTC

[jira] [Created] (ARROW-10698) [C++] Optimize union equality comparison

Antoine Pitrou created ARROW-10698:
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             Summary: [C++] Optimize union equality comparison
                 Key: ARROW-10698
                 URL: https://issues.apache.org/jira/browse/ARROW-10698
             Project: Apache Arrow
          Issue Type: Wish
          Components: C++
            Reporter: Antoine Pitrou


Currently, union array comparison in {{ArrayRangeEqual}} computes child equality over single union elements. This adds a large per-element comparison overhead. At least for sparse unions, it may be beneficial to detect contiguous runs of child ids and run child comparisons on entire runs.



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