DriverContext driverCxt = new DriverContext();
MergeFileTask taskExec = new MergeFileTask();
taskExec.initialize(db.getConf(), null, driverCxt);
taskExec.setWork(mergeWork);
taskExec.setQueryPlan(this.getQueryPlan());
int ret = taskExec.execute(driverCxt);
return ret;
}
private HiveAuthorizer getSessionAuthorizer() {