@Override
    public void close(boolean aborted) throws HiveException {
      super.close(aborted);
      if (!aborted && null != streamingKey) {
        writeSingleRow(streamingKey, aggregationBufferSet);
      }
    }
A pool of VectorAggregationBufferRow to avoid repeated allocations
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/VectorGroupByOperator.java