Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11765#issuecomment-198591713
@davies, changing `InferFiltersFromConstraints` is unable to fix all the
issues. `InferFiltersFromConstraints` is to infer the filter conditions based
on the Constraints of a specific node. Fixing `InferFiltersFromConstraints` is
needed but it does not cover all the cases. If you checking the Constraint
generation, it will not pop up all the conditions to their parents. It depends
on the operator type. This is the fundamental reason why we should use the
Constraints to avoid filter condition pushdown.
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