Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12719#issuecomment-215620606
the scope of `NullPropagation` is one operator, but we need a
`FoldablePropagation` whose scope is the whole plan tree. Think about `Sort(a,
Filter(true, Project(1 AS a)))`, we should be able to propagate the foldable
information up.
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