Github user vidma commented on the pull request:
https://github.com/apache/spark/pull/9451#issuecomment-204493340
@marmbrus pinging you to tag Catalyst plan rewriting guru.
For current inner join PR, there's a flanky test in python, couldn't track
it down yet.
For more generic case (next PR), It doesn't seem to be easy not to loose
table aliases, and add a randomized spraying column as extra left join key.
P.S. I'm in SF bay until Fri 8 Apr (better before Thu 9), so I could come
over to chat to you guys live.
Cheers.
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