@SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "Expose internal rep for efficiency")
  public Timestamp asScratchTimestamp(int elementNum) {
    scratchTimestamp.setTime(time[elementNum]);
    scratchTimestamp.setNanos(nanos[elementNum]);
    return scratchTimestamp;
  }
Return the scratch Timestamp object set from a row.
We assume the entry has already been NULL checked and isRepeated adjusted.
@param elementNum
@return
storage-api/src/java/org/apache/hadoop/hive/ql/exec/vector/TimestampColumnVector.java