MariaDB [test]> create table t1 (a int);
Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> set @a:=-1;
Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> insert into t1 select @a:=@a+1 from information_schema.session_variables;
Query OK, 404 rows affected (0.03 sec)
Records: 404  Duplicates: 0  Warnings: 0

MariaDB [test]> set histogram_size=10;
Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> set histogram_type='single_prec_hb';
Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> analyze table t1 persistent for all;
+---------+---------+----------+----------+
| Table   | Op      | Msg_type | Msg_text |
+---------+---------+----------+----------+
| test.t1 | analyze | status   | OK       |
+---------+---------+----------+----------+
1 row in set (0.01 sec)

MariaDB [test]> select *, hex(histogram) from mysql.column_stats\G
*************************** 1. row ***************************
       db_name: test
    table_name: t1
   column_name: a
     min_value: 0
     max_value: 403
   nulls_ratio: 0.0000
    avg_length: 4.0000
 avg_frequency: 1.0000
     hist_size: 10
     hist_type: 
     histogram: .E\s����
hex(histogram): 162E455C738BA2B9D0E8
1 row in set (0.00 sec)


MariaDB [test]> set histogram_size=20;
Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> analyze table t1 persistent for all;
+---------+---------+----------+-----------------------------+
| Table   | Op      | Msg_type | Msg_text                    |
+---------+---------+----------+-----------------------------+
| test.t1 | analyze | status   | Table is already up to date |
+---------+---------+----------+-----------------------------+
1 row in set (0.01 sec)

MariaDB [test]> select *, hex(histogram) from mysql.column_stats\G
*************************** 1. row ***************************
       db_name: test
    table_name: t1
   column_name: a
     min_value: 0
     max_value: 403
   nulls_ratio: 0.0000
    avg_length: 4.0000
 avg_frequency: 1.0000
     hist_size: 20
     hist_type: 
     histogram: 
                $0<HT`my���������
hex(histogram): 0C1824303C4854606D7985919EAAB6C2CEDAE6F2
1 row in set (0.00 sec)