presto-main/src/main/java/io/prestosql/operator/NestedLoopJoinOperator.java/NestedLoopJoinOperatorFactory/createOperator
class NestedLoopJoinOperatorFactory:        @Override
        public Operator createOperator(DriverContext driverContext)
        {
            checkState(!closed, "Factory is already closed");
            NestedLoopJoinBridge nestedLoopJoinBridge = joinBridgeManager.getJoinBridge(driverContext.getLifespan());

            OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, NestedLoopJoinOperator.class.getSimpleName());

            joinBridgeManager.probeOperatorCreated(driverContext.getLifespan());
            return new NestedLoopJoinOperator(
                    operatorContext,
                    nestedLoopJoinBridge,
                    () -> joinBridgeManager.probeOperatorClosed(driverContext.getLifespan()));
        }