Github user viirya commented on the issue:
https://github.com/apache/spark/pull/14912
To maintain the predicate sets may increase much complexity as I can think.
I don't know how big the set could be. But once you change one of the
predicates, you need to construct all equivalent predicates in the set too. I
think we can maintain CNF and simplification predicates. CNF should be enough
to push down predicates and simplification predicate can be used in Filter
execution.
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