Github user sameeragarwal commented on the pull request:
https://github.com/apache/spark/pull/11618#issuecomment-195254941
@gatorsmile instead of having a special rule for join, we can probably
infer all possible filters based on constraints (... something along the lines
of
https://github.com/sameeragarwal/spark/commit/ce4c9441f32ab39eaebd7fe2081cf1c789a1ef4a).
This should now subsume the predicate transitivity optimization right?
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