zhengruifeng opened a new pull request #28206: [SPARK-31436][ML] MinHash keyDistance optimization URL: https://github.com/apache/spark/pull/28206 ### What changes were proposed in this pull request? re-impl `keyDistance` ### Why are the changes needed? current implementation based on set operations is inefficient ### Does this PR introduce any user-facing change? No ### How was this patch tested? existing testsuites
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