presto-main/src/main/java/io/prestosql/operator/NestedLoopJoinOperator.java/NestedLoopJoinOperator/NestedLoopJoinOperatorFactory
class NestedLoopJoinOperator:        private NestedLoopJoinOperatorFactory(NestedLoopJoinOperatorFactory other)
        {
            requireNonNull(other, "other is null");
            this.operatorId = other.operatorId;
            this.planNodeId = other.planNodeId;

            this.joinBridgeManager = other.joinBridgeManager;

            // closed is intentionally not copied
            closed = false;

            joinBridgeManager.incrementProbeFactoryCount();
        }