Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/1069#issuecomment-48281479
@rxin It looks like Scala is requiring developers to be more explicit about
intention to use these features; these warnings become errors in Scala 2.11
actually. So my opinion is that use of the feature should not be enabled
globally with a compiler flag, but enabled per compilation unit with an import.
The latter is the currently how the codebase works.
Since this PR just swaps the latter for former, I personally would argue
that this not be merged. Actually, an earlier PR *also* add the compiler flag
though. I think it should be removed and any extra warnings fixed. If there is
any support for that, and no objections, I can raise a PR for that.
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