presto-main/src/main/java/io/prestosql/operator/exchange/LocalExchangeSourceOperator.java/LocalExchangeSourceOperator/LocalExchangeSourceOperatorFactory
class LocalExchangeSourceOperator:        public LocalExchangeSourceOperatorFactory(int operatorId, PlanNodeId planNodeId, LocalExchangeFactory localExchangeFactory)
        {
            this.operatorId = operatorId;
            this.planNodeId = requireNonNull(planNodeId, "planNodeId is null");
            this.localExchangeFactory = requireNonNull(localExchangeFactory, "localExchangeFactory is null");
        }