Github user jkbradley commented on the issue:
https://github.com/apache/spark/pull/15415
I agree that, if the set of rules is small (1-2 GB max), then collecting
and broadcasting it is best. But for larger sets of rules, we'd have to keep
it distributed.
I'm very surprised by the time difference in your comparison. I'll
experiment a little myself and get back soon.
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