Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/spark/pull/11438#issuecomment-190483710
Hi, @srowen .
I've test more, but found that `-Ywarn-unused-import` option is not
reliable yet in Scala 2.11.7.
Please refer https://issues.scala-lang.org/browse/SI-9616 .
I think I can not handle Scala part in this PR.
Sorry about that.
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