Github user Yunni commented on the issue:
https://github.com/apache/spark/pull/15874
Hi @sethah, grouping to a number of buckets does not really affect the
independence since p is a mach larger prime. For example, in
http://people.csail.mit.edu/mip/papers/kwise-lb/kwise-lb.pdf, they use "mod b".
Since we don't care about the hash universe here, I am OK with changing to
`(ax + b mod p)` if you think that makes more sense?
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