Github user viirya commented on the issue: https://github.com/apache/spark/pull/14912 The CNF exponential expansion issue is an important concern in previous works. Actually you can find that this patch doesn't produce a real CNF for predicate. I use `splitDisjunctivePredicates` to obtain disjunctive predicates and convert them to conjunctive form. The conversion here is not recursive. I think this should prevent exponential explosion. Of course it is a compromise and can't benefit for all predicates. But I would suspect how often a complex predicate need complete conversion of CNF is used.
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