presto-main/src/main/java/io/prestosql/sql/planner/sanity/ValidateDependenciesChecker.java/ValidateDependenciesChecker/visitPlan
class ValidateDependenciesChecker:        @Override
        protected Void visitPlan(PlanNode node, Set<Symbol> boundSymbols)
        {
            throw new UnsupportedOperationException("not yet implemented: " + node.getClass().getName());
        }