SELECT executed after EXPLAIN returns ER_INTERNAL_ERROR

drop table if exists t1;

create table t1 (a int) engine=Columnstore;

explain select * from t1;

select * from t1;

MariaDB [db]> drop table if exists t1;

Query OK, 0 rows affected (0.403 sec)

MariaDB [db]> create table t1 (a int) engine=Columnstore;

Query OK, 0 rows affected (0.443 sec)

MariaDB [db]> explain select * from t1;

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

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

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

|    1 | PUSHED SELECT | NULL  | NULL | NULL          | NULL | NULL    | NULL | NULL | NULL  |

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

1 row in set (0.045 sec)

MariaDB [db]> select * from t1;

ERROR 1815 (HY000): Internal error: Unknown error