private void iterateNoSelectionHasNulls(
        Aggregation myagg,
        int batchSize,
        boolean[] isNull) {

      for (int i=0; i< batchSize; ++i) {
        if (!isNull[i]) {
          myagg.count += 1;
        }
      }
    }
class for storing the current aggregate value.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/aggregates/VectorUDAFCount.java