ANALYZE TABLE shows wrong 'rows' value for ORDER BY query

create table t1 (

  a int, 

  filler1 char(128),

  filler2 char(128),

  key(a)

);

insert into t1 

select A.a+10*B.a+100*C.a, repeat('abc-',32), repeat('abc-',32)

from ten A, ten B, ten C;

explain select a from t1 order by a limit 10;

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

| id   | select_type | table | type  | possible_keys | key  | key_len | ref  | rows | Extra       |

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

|    1 | SIMPLE      | t1    | index | NULL          | a    | 5       | NULL |   10 | Using index |

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

analyze select a from t1 order by a limit 10;

MariaDB [j1]> analyze select a from t1 order by a limit 10;

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

| id   | select_type | table | type  | possible_keys | key  | key_len | ref  | rows | r_rows | filtered | r_filtered | Extra       |

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

|    1 | SIMPLE      | t1    | index | NULL          | a    | 5       | NULL |  978 |  10.00 |   100.00 |     100.00 | Using index |

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