Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/4354#issuecomment-72792534
Do you mind adding more inline comment? My worry is just complexity. If
nobody uses this, it's going to be a bunch of code there that for the sake of
supporting a thing in Hive.
Do any other database systems support this unique join syntax? (Or
something similar)
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