Github user nchammas commented on the issue:
https://github.com/apache/spark/pull/14579
None of our options seems great, but if I had to rank them I would say:
1. Add new `Persisted...` classes.
2. Make no changes.
3. Add separate `persisted()` or `cached()` utility method.
4. Modify base RDD and DataFrame classes.
Adding new internal classes for this use-case honestly seems a bit
heavy-handed to me, so if we are against that then I would lean towards not
doing anything.
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