code: public List<Map> getValues() {
          if (values == null) {
              values = Reflection.toTypedList(getMap().get(BATCH_INSERTION_VALUES_KEY), Map.class);
          }
          return values;
      }
docs: Records to be inserted.
  A batch prepared insert sql is like:
  <p>
  <code>
  INSERT INTO table_name VALUES
  (?,?,?),
  (?,?,?),
  (?,?,?)
  </code>
  <p>
  values for the batch is a map list
  
  @return values