Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/11673#issuecomment-196436520
After thinking about it more, I wonder if `missingInput` was really the
right way to handle this problem.
Another option (that is used in every other operator now) is to require
that an `Alias` is the only way to produce a new Attribute in a non-leaf node
of a query plan. Thoughts?
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