Github user jkbradley commented on the issue: https://github.com/apache/spark/pull/16495 The key point @vlad17 made was that an operation which should be O(N) is taking O(N^2) in the current implementation. Let's fix that, regardless of whether or not we add a stress test. Also, we can't add such a long test for this. Unit tests should take seconds at most, and ideally sub-second times. Offline stress testing is great, though. Thanks!
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