Github user Yunni commented on the issue:
https://github.com/apache/spark/pull/15800
@jkbradley Averaging indicators make more sense for an AND-amplified
MinHash function. The hash distance is 0 when all hash values are equal, and
grows as the more hash values differ.
As we are moving to `Array[Vector]` as our output type, I think the
averaging indicators are good for comparing the `Vector`(AND-amplification),
but we still need binary distance for `Array`(OR-amplification).
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