Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/4055#discussion_r23589337
--- Diff: core/src/main/scala/org/apache/spark/scheduler/ResultTask.scala
---
@@ -65,4 +65,6 @@ private[spark] class ResultTask[T, U](
override def preferredLocations: Seq[TaskLocation] = preferredLocs
override def toString = "ResultTask(" + stageId + ", " + partitionId +
")"
+
+ override def canEqual(other: Any): Boolean =
other.isInstanceOf[ResultTask[T, U]]
--- End diff --
You can try `Seq[Int](1).isInstanceOf[Seq[String]]` in REPL, it will return
true.
`isInstanceOf` can't work on generic type because of JVM type erasure.
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