Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11565#issuecomment-193616509
We still can prune the child even if we do not have `projectList`. See the
following code:
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala#L400-L406
However, this does not cover all the cases. Let me submit a PR for
improving it. Thanks!
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