code: static <T1, T2> Flowable<Notification<CallableResultSet2<T1, T2>>> createWithTwoResultSets(
              Single<Connection> connection, String sql, Flowable<List<Object>> parameterGroups,
              List<ParameterPlaceholder> parameterPlaceholders, Function<? super ResultSet, ? extends T1> f1,
              Function<? super ResultSet, ? extends T2> f2, int fetchSize) {
          return connection.toFlowable().flatMap(
                  con -> createWithTwoResultSets(con, sql, parameterGroups, parameterPlaceholders, f1, f2, fetchSize));
      }
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