Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21111
Thanks for doing this as a follow-up. I had one minor comment, but
otherwise I'm +1. I see what you mean about using `PhysicalOperation` now. It
is slightly cleaner and I guess `PhysicalOperation` is the right way to
accumulate the filters and projection from a sub-tree.
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