code: public <T,H,R> DynamoDBTableMapper<T,H,R> newTableMapper(Class<T> clazz) {
          DynamoDBMapperConfig config = mergeConfig(null);
          return new DynamoDBTableMapper<T,H,R>(this.db, this, config, getTableModel(clazz, config));
      }
docs: Creates a new table mapper using this mapper to perform operations.
  @param <T> The object type which this mapper operates.
  @param <H> The hash key value type.
  @param <R> The range key value type; use <code>?</code> if no range key.
  @param clazz The object class.
  @return The table mapper.