@Override
    public void setNextVectorBatchGroupStatus(boolean isLastGroupBatch) throws HiveException {
      // Ignore it.
    }
The VectorAggregationBufferRow instance. This field can be shared with ProcessingMode
subclasses, where is only 1 VectorAggregationBufferRow instance needed at the same time. This
is the case for ProcessingModeGlobalAggregate, ProcessingModeReduceMergePartial,
ProcessingModeStreaming, but not for ProcessingModeHashAggregate where this field is not
used.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/VectorGroupByOperator.java