Github user merlintang commented on the issue:
https://github.com/apache/spark/pull/16965
@Yunni I agree with you that the current NN search and Join are using the
AND-OR. We can discuss how to use the OR-AND for that two searching as well.
For the OR-AND option, it is used when the effective threshold is low.
please refer to the table in the page 31 and 33.
http://web.stanford.edu/class/cs345a/slides/05-LSH.pdf
You can notice, when the p is lower, the OR-AND can amplify the hash family
possibility from 0.0985 to 0.5440.
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