Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9748#issuecomment-157340460
Lacking background knowledge to sign off this one. Referenced discussions
in #9243, https://github.com/metamx/spark/pull/1, SPARK-5949, and SPARK-11016.
If understand it correctly, currently `RoaringBitmap` isn't a direct dependency
of Spark, instead it's just a transitive dependency, and Kryo needs it to work
properly?
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