Tom Lane
3104a92866
Another go at making pred_test() handle all reasonable combinations
of AND and OR clauses. The key point here is that an OR on the predicate side has to be treated gingerly: we may be able to prove that the OR is implied even when no one of its components is implied. For example (x OR y) implies (x OR y OR z) even though no one of x, y, or z can be individually proven. This code handles both the example shown recently by Sergey Koshcheyev and the one shown last October by Dawid Kuroczko.
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