COLUMNSTORE_COLUMNS.IS_NULLABLE always reports false

MariaDB [db]> create table t1 (a int null, b int not null) engine=Columnstore;

Query OK, 0 rows affected (0.457 sec)

MariaDB [db]> insert into t1 values (null,1);

Query OK, 1 row affected (0.182 sec)

MariaDB [db]> select table_schema, table_name, is_nullable from information_schema.columnstore_columns;

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

| table_schema | table_name | is_nullable |

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

| db           | t1         |           0 |

| db           | t1         |           0 |

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

2 rows in set (0.038 sec)