Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/16252#discussion_r92224929
--- 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 --
Ideally, only the null check should be there - with the !hasNext enforced
as unrolled = null if false.
This is part of a tight loop, and would be better if the footprint is kept
as small as possible.
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