Estimation for filtered rows is far off with JSON_HB histogram

drop table if exists t1;

create table t1 (c char(8)) engine=MyISAM;

insert into t1 values ('1x');

insert into t1 values ('1x');

insert into t1 values ('1xx');

insert into t1 values ('0xx');

insert into t1 select * from t1;

insert into t1 select * from t1;

set histogram_type= SINGLE_PREC_HB;

analyze table t1 persistent for all;

analyze

select c from t1 where c > '1';

set histogram_type= DOUBLE_PREC_HB;

analyze table t1 persistent for all;

analyze

select c from t1 where c > '1';

set histogram_type= JSON_HB;

analyze table t1 persistent for all;

analyze

select c from t1 where c > '1';

# Cleanup

drop table t1;

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

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

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

|    1 | SIMPLE      | t1    | ALL  | NULL          | NULL | NULL    | NULL | 16   | 16.00  |    74.90 |      75.00 | Using where |

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

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

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

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

|    1 | SIMPLE      | t1    | ALL  | NULL          | NULL | NULL    | NULL | 16   | 16.00  |    75.00 |      75.00 | Using where |

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

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

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

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

|    1 | SIMPLE      | t1    | ALL  | NULL          | NULL | NULL    | NULL | 16   | 16.00  |    33.33 |      75.00 | Using where |

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