Github user hvanhovell commented on a diff in the pull request: https://github.com/apache/spark/pull/16252#discussion_r92399999 --- Diff: core/src/main/scala/org/apache/spark/storage/memory/MemoryStore.scala --- @@ -694,7 +694,7 @@ private[storage] class PartiallyUnrolledIterator[T]( } override def next(): T = { - if (unrolled == null) { + if (unrolled == null || !unrolled.hasNext) { --- End diff -- > The returned result of `next` is only defined if `hasNext` is true. That does not mean a `next` has to be preceded by a `hasNext` call right?
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