public void setFromScratchIntervalDayTime(int elementNum) {
    this.totalSeconds[elementNum] = scratchIntervalDayTime.getTotalSeconds();
    this.nanos[elementNum] = scratchIntervalDayTime.getNanos();
  }
Set a field from the current value in the scratch interval day time.

This is a FAST version that assumes the caller has checked to make sure the scratch interval
day time is valid and elementNum is correctly adjusted for isRepeating.  And, that the isNull
entry has been set.  Only the output entry fields will be set by this method.

@param elementNum
storage-api/src/java/org/apache/hadoop/hive/ql/exec/vector/IntervalDayTimeColumnVector.java