Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/20002#discussion_r158592810
--- Diff: core/src/main/scala/org/apache/spark/Partitioner.scala ---
@@ -21,6 +21,8 @@ import java.io.{IOException, ObjectInputStream,
ObjectOutputStream}
import scala.collection.mutable
import scala.collection.mutable.ArrayBuffer
+import scala.language.existentials
--- End diff --
If we explicitly set the type, is it still required ? For example, with
`val hasMaxPartitioner: Option[RDD[_]] = ...` ?
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