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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