Github user Yunni commented on the issue:
https://github.com/apache/spark/pull/15800
@sethah Not exactly. Based on the logic in `approxNearestNeighbor`, if
there aren't enough candidates where the distance is zero, we'll scan the the
whole dataset.
I don't think multi-probing works well on MinHash. Multi-probing mostly
benefits LSH family like hyperplane projection and bits sampling.
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