Github user holdenk commented on the issue:
https://github.com/apache/spark/pull/14579
@nchammas to be clear - subclassing only breaks pipelining if the
persisted_rdd is later unpersisted (e.g. used with a `with` statement or
otherwise) - otherwise you can't pipeline on top of a persisted rdd anyways
(which is why I say its a corner case).
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