Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/12309#issuecomment-216327912
Yeah I think it has to be something like `(a: String => Unit) =>
printPipeContext.call(new VoidFunction[String]() { override def call(s:
String): Unit = a(s) })` I'm happy to punt on this aspect since it's
non-trivial and not the intent of your change. If you can create any test code
to cover this path I think it's GTG.
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