Github user tdas commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
    @@ -1589,7 +1589,8 @@ abstract class RDD[T: ClassTag](
        * This is introduced as an alias for `isCheckpointed` to clarify the 
semantics of the
        * return value. Exposed for testing.
    -  private[spark] def isCheckpointedAndMaterialized: Boolean = 
    +  private[spark] def isCheckpointedAndMaterialized: Boolean =
    +    checkpointData.exists(_.isCheckpointed)
    --- End diff --
    what do you mean. if isCheckpointedAndMaterialized = isCheckpointed, and 
you override isCheckpointed, then that would change the behavior of 
isCheckpointedAndMaterialized as well. 

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