public TimestampColumnVector setUsingProlepticCalendar(boolean usingProlepticCalendar) {
    this.usingProlepticCalendar = usingProlepticCalendar;
    return this;
  }
Change the calendar to or from proleptic. If the new and old values of the flag are the
same, nothing is done.
useProleptic - set the flag for the proleptic calendar
updateData - change the data to match the new value of the flag.
storage-api/src/java/org/apache/hadoop/hive/ql/exec/vector/TimestampColumnVector.java