presto-main/src/main/java/io/prestosql/operator/ValuesOperator.java/ValuesOperator/createOperator
class ValuesOperator:        @Override
        public Operator createOperator(DriverContext driverContext)
        {
            checkState(!closed, "Factory is already closed");
            OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, ValuesOperator.class.getSimpleName());
            return new ValuesOperator(operatorContext, pages);
        }