docs: public <T, K> List<T> getAll(ColumnFamily<K, String> columnFamily,
              Class<T> itemClass) throws Exception {
          Mapping<T> mapping = getMapping(itemClass);
          Rows<K, String> result = keyspace.prepareQuery(columnFamily)
                  .getAllRows().execute().getResult();
          return mapping.getAll(result);
      }