Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7334#issuecomment-180527530
Alright, just pushed an update which I think should fix the laziness
problems with `.rdd` and `.cache`. The key idea is to move the `ReturnAnswer`
injection into `DataFrame.collect()` rather than always putting it at the root
of the logical plan before invoking the planner.
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