Github user nchammas commented on the issue:
https://github.com/apache/spark/pull/14579
> So there is no chaining requirement, and it will only work in a with
statement.
@MLnick - Couldn't we also create a scenario (like @holdenk did earlier)
where a user does something like this?
```python
persisted_rdd = persisted(rdd)
persisted_rdd.map(...).filter(...).count()
```
This would break pipelining too, no?
And I think the expectation would be for it not to break pipelining,
because existing common context managers in Python don't have a requirement
that they _must_ be used in a `with` block.
For example, `f = open(file)` works fine, as does `s = requests.Session()`,
and the resulting objects have the same behavior as they would inside a `with`
block.
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