*     queryFuture.transformAsync(withoutCloser(Result::getRowsFuture), executor);
   * }
   *
   * @param function transforms the value of a {@code ClosingFuture} step to a {@link
   *     ListenableFuture} with the value of a derived step
   */
  public static <V extends @Nullable Object, U extends @Nullable Object>
      AsyncClosingFunction<V, U> withoutCloser(AsyncFunction<V, U> function) {
    checkNotNull(function);