Github user IceMan81 commented on the issue:
https://github.com/apache/spark/pull/7379
@zzeekk Okay, I get the idea. But, what would you do for timestamp ranges;
how would you get additional equi-join conditions. The idea of
`floor($"df1.position"/10)===floor($"df2a.position_from"/10)` (or in the case
of timestamps `"df1.timestamp" - interval === $"df21.timestamp" - interval` )
wouldn't apply as you may have not have timestamps that match that condition.
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