presto-main/src/main/java/io/prestosql/execution/SqlTaskExecution.java/Status/checkLifespanCompletion
class Status:        private void checkLifespanCompletion(Lifespan lifespan)
        {
            if (lifespan.isTaskWide()) {
                return; // not a driver group
            }
            if (!isNoMoreDriverRunners(lifespan)) {
                return;
            }
            if (getRemainingDriver(lifespan) != 0) {
                return;
            }
            taskContext.addCompletedDriverGroup(lifespan);
        }