presto-main/src/main/java/io/prestosql/sql/planner/PlanFragmenter.java/PlanFragmenter/visitValues
class PlanFragmenter:        @Override
        public PlanNode visitValues(ValuesNode node, RewriteContext<FragmentProperties> context)
        {
            context.get().setSingleNodeDistribution();
            return context.defaultRewrite(node, context.get());
        }