class StringColumn extends AbstractStringColumn<StringColumn> {

  public double[] asDoubleArray() {
    return Arrays.stream(lookupTable.asIntArray()).asDoubleStream().toArray();
  }

  private  StringColumn(String name, Collection<String> strings);
  private  StringColumn(String name, DictionaryMap map);
  private  StringColumn(String name);
  private  StringColumn(String name, String[] strings);

}