Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/6968#discussion_r33739769
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -194,7 +194,7 @@ abstract class RDD[T: ClassTag](
@transient private var partitions_ : Array[Partition] = null
/** An Option holding our checkpoint RDD, if we are checkpointed */
- private def checkpointRDD: Option[RDD[T]] =
checkpointData.flatMap(_.checkpointRDD)
+ private def checkpointRDD: Option[CheckpointRDD[T]] =
checkpointData.flatMap(_.checkpointRDD)
--- End diff --
how is this hardcoding? Semantically we want the type of this to always be
`CheckpointRDD`. This is just enforcing it in code.
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