public void initializeLocalWork(Configuration hconf) throws HiveException {
    if (CollectionUtils.isNotEmpty(childOperators)) {
      for (Operator<? extends OperatorDesc> childOp : childOperators) {
        childOp.initializeLocalWork(hconf);
      }
    }
  }
This method can be used to retrieve the results from async operations
started at init time - before the operator pipeline is started.

@param os
@throws HiveException
ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java