Github user viirya commented on the issue:
https://github.com/apache/spark/pull/14452
Because the actual improvement of this de-duplication depends on the
complexity of disjunctive predicate pushdown and CTE subquery, if we can't have
general rule to decide whether de-duplicate or not, I think can we have a
config (default off) to enable/disable this subquery de-duplication.
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