Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/10163#issuecomment-162397946
This is a great feature! Can we implement it in individual expressions
instead of centralizing them in `LogicalPlan.samResult`? A lof of commutative
operators need it like `And`, `Multiply`, `Max`, etc. Maybe we can improve
`Expression.semanticEquals`?
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