presto-main/src/main/java/io/prestosql/execution/SqlTaskExecution.java/DriverSplitRunnerFactory/closeDriverFactoryIfFullyCreated
class DriverSplitRunnerFactory:        public void closeDriverFactoryIfFullyCreated()
        {
            if (closed) {
                return;
            }
            for (Lifespan lifespan : status.getAndAcknowledgeLifespansWithNoMoreDrivers(pipelineContext.getPipelineId())) {
                driverFactory.noMoreDrivers(lifespan);
            }
            if (!isNoMoreDriverRunner() || status.getPendingCreation(pipelineContext.getPipelineId()) != 0) {
                return;
            }
            driverFactory.noMoreDrivers();
            closed = true;
        }