Github user davies commented on the issue:
https://github.com/apache/spark/pull/16121
It's pretty tricky to make the chained CartesianDeserializer work, maybe
it's easier to have a workaround in the RDD.cartesian() to add an
_reserialize() between chained cartesian (or zipped), it will be less
performant, but will be easy to reason about.
The current patch may still be wrong in case of chained
DartesianDeserializer and PairSerializer, for example, a.cartesian(b.zip(c))
(have not verified yet)
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