Cross-engine join fails: fatal error running mysql_real_connect() in libmysql_client lib (1698) (Access denied for user 'root'@'localhost')

drop table if exists t2;

drop table if exists t3;

create table t2 (a int) engine=Columnstore;

insert into t2 values (1),(2);

create table t3 (a int) engine=InnoDB;

insert into t3 values (1),(2);

select * from t2 join t3 on (t2.a = t3.a);

MariaDB [db]> select * from t2 join t3 on (t2.a = t3.a);

ERROR 1815 (HY000): Internal error: fatal error running mysql_real_connect() in libmysql_client lib (1698) (Access denied for user 'root'@'localhost')

MariaDB [db]> select * from t2;

+------+

| a    |

+------+

|    1 |

|    2 |

+------+

2 rows in set (0.040 sec)

MariaDB [db]> select * from t3;

+------+

| b    |

+------+

|    1 |

|    2 |

+------+

2 rows in set (0.001 sec)