Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/14579
@nchammas a utility method (e.g. `cached`) - actually it will be a context
manager class implemented in the same way as `closing` - will work because it
only needs to return the context manager, not the RDD instance. So there is no
chaining requirement, and it will only work in a `with` statement.
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