Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7334#issuecomment-123126683
There's one problem with the planner changes here: during logical +
physical planning we don't know in advance whether `executeTake()` is going to
be called. If I was to call `.rdd` on a query plan with a limit as the final
operator then I would get an error.
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