Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/6205#issuecomment-115115181
> Is this something that we need to prevent from accidentally happening
again?
I encountered this issue. Scala compiler will try to pack all parameters
into a Tuple when it cannot find a match method. Maybe we should consider
adding the compiler flag `-Ywarn-adapted-args` to make the compiler output a
warning, or `-Yno-adapted-args` to disable this feature.
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