presto-main/src/main/java/io/prestosql/operator/ValuesOperator.java/ValuesOperatorFactory/ValuesOperatorFactory
class ValuesOperatorFactory:        public ValuesOperatorFactory(int operatorId, PlanNodeId planNodeId, List<Page> pages)
        {
            this.operatorId = operatorId;
            this.planNodeId = requireNonNull(planNodeId, "planNodeId is null");
            this.pages = ImmutableList.copyOf(requireNonNull(pages, "pages is null"));
        }