Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/14579
@nchammas @holdenk @davies @rxin how about the approach of @MechCoder in
https://github.com/apache/spark/pull/14579#discussion_r74813935?
I think this will work well, so we could raise an error to prevent (almost
all I think) usages outside of the intended pattern of `with some_rdd.cache()
as x:` or `with some_rdd_already_cached as x:`
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