presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/TransformCorrelatedInPredicateToJoin.java/DecorrelatingVisitor/decorrelate
class DecorrelatingVisitor:        public Optional<Decorrelated> decorrelate(PlanNode reference)
        {
            return lookup.resolve(reference).accept(this, reference);
        }