Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/3505#issuecomment-66594423
I removed my changes of the `join` methods. Now it only adds new
`skewedJoin` methods, and users need to call them explicitly.
> Other DSLs on top of Spark core like Pig, Hive, and Scalding.
A great point I never thought.
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