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

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