*
   * <p>Example usage:
   *
   * {@snippet :
   * ClosingFuture<QueryResult> queryFuture =
   *     queryFuture.catching(
   *         QueryException.class, (closer, x) -> Query.emptyQueryResult(), executor);
   * }
   *
   * <p>When selecting an executor, note that {@code directExecutor} is dangerous in some cases. See