Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/6065#issuecomment-102216834
I'm closing this PR after discussing with @davies. `useMemo` is useful to
avoid repeatedly serializing class objects. However, other than this case, it
might bring overhead for Spark use cases. @davies is going to test a hybrid
version that only memorizes class instances.
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