def local_index_non_key_attributes(local_sec_index)
        attributes = {}
        if !local_sec_index["projection"]["non_key_attributes"].nil?
          hashcode = local_index_hashcode(local_sec_index)
          attributes = {"local_secondary_index.#{hashcode}.non_key_attributes.#" => local_sec_index["projection"]["non_key_attributes"].length.to_s}