Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/11911#issuecomment-201542265
LGTM. It looks like the eager evaluation was accidentally introduced in
6600786dddc89cb16779ee56b9173f63a3af3f27; prior to that patch it used to be
lazy. I'm going to merge this into master. Thanks!
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