presto-main/src/main/java/io/prestosql/sql/planner/optimizations/AddExchanges.java/Rewriter/visitPlan
class Rewriter:        @Override
        protected PlanWithProperties visitPlan(PlanNode node, PreferredProperties preferredProperties)
        {
            return rebaseAndDeriveProperties(node, planChild(node, preferredProperties));
        }