presto-main/src/main/java/io/prestosql/execution/MemoryTrackingRemoteTaskFactory.java/MemoryTrackingRemoteTaskFactory/MemoryTrackingRemoteTaskFactory
class MemoryTrackingRemoteTaskFactory:    public MemoryTrackingRemoteTaskFactory(RemoteTaskFactory remoteTaskFactory, QueryStateMachine stateMachine)
    {
        this.remoteTaskFactory = requireNonNull(remoteTaskFactory, "remoteTaskFactory is null");
        this.stateMachine = requireNonNull(stateMachine, "stateMachine is null");
    }