Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/13221#issuecomment-221745872
I think its unfortunate that you have to actually start the query before
you can see what the physical plan looks like, that seems counter to the goal
of explain.
How hard would it be to insert stubs for the sources so we could run the
actual planner (we would want to avoid anything with side effects like actually
instantiating a source).
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