Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/14579
@nchammas I looked at the `@contextmanager` decorator. It is an easy way to
create a method that returns a context manager, but is is essentially _only_
usable in a `with` statement as it returns a
`contextlib.GeneratorContextManager`. For this use case it does not solve the
issue that we need to return the RDD/DF instance from `cache`.
As far as I can see for the `closing` helper function, it is just a
[context manager
itself](https://github.com/python/cpython/blob/master/Lib/contextlib.py#L163),
so the same as the final variant for option (a) mentioned above, i.e. `with
cached(rdd) as ...`
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