@Deprecated
  public java.sql.Date add(HiveIntervalYearMonth interval, java.sql.Date dt) {
    if (dt == null || interval == null) {
      return null;
    }

    java.sql.Date dtResult = new java.sql.Date(0);
    add(interval, dt, dtResult);

    return dtResult;
  }
Perform date + int operation .
@param dt the date
@param interval the int (days)
@return the resulting date
ql/src/java/org/apache/hadoop/hive/ql/util/DateTimeMath.java