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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