Suspicious limitation for RANGE frames

MariaDB [test]> create table t (i int, j int);

Query OK, 0 rows affected (0.36 sec)

MariaDB [test]> select i, nth_value(i,2) over (partition by i order by i, j range unbounded preceding) from t;

ERROR 4019 (HY000): RANGE-type frame requires ORDER BY clause with single sort key

MariaDB [test]> select i, nth_value(i,2) over (partition by i order by i, j rows unbounded preceding) from t;

Empty set (0.00 sec)

postgres=# create table t (i int, j int);

CREATE TABLE

postgres=# select i, nth_value(i,2) over (partition by i order by i, j range unbounded preceding) from t;

 i | nth_value 

---+-----------

(0 rows)