Github user lemire commented on a diff in the pull request:
https://github.com/apache/spark/pull/9661#discussion_r44664260
--- Diff:
core/src/main/scala/org/apache/spark/serializer/KryoSerializer.scala ---
@@ -362,6 +364,12 @@ private[serializer] object KryoSerializer {
classOf[StorageLevel],
classOf[CompressedMapStatus],
classOf[HighlyCompressedMapStatus],
+ classOf[RoaringBitmap],
+ classOf[RoaringArray],
+ classOf[RoaringArray.Element],
--- End diff --
Class RoaringArray.Element was protected or private and has been removed.
Moreover, it is unclear to me why you even need to declare ``RoaringArray``,
``ArrayContainer`` and ``BitmapContainer``. Roaring bitmaps use their own
serialization process that does not go through the standard Java serialization
process.
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