code: public List<String> asList() {
          List<String> strings = new ArrayList<>();
          for (String category : this) {
              strings.add(category);
          }
          return strings;
      }
docs: Returns a List&lt;String&gt; representation of all the values in this column
  <p>
  NOTE: Unless you really need a string consider using the column itself for large datasets as it uses much less memory
  
  @return values as a list of String.