public void setNullValue(int elementNum) {
    totalSeconds[elementNum] = 0;
    nanos[elementNum] = 1;
  }
Set row to standard null value(s).
We assume the entry has already been isRepeated adjusted.
@param elementNum
storage-api/src/java/org/apache/hadoop/hive/ql/exec/vector/IntervalDayTimeColumnVector.java