collation_server = utf8_general_ci

character_set_server = utf8

MariaDB [tpch1]> create table if not exists bug4594(c1 char(5))engine=columnstore;

Query OK, 0 rows affected (0.330 sec)

MariaDB [tpch1]> insert into bug4594 values ('abc'), ('def');

Query OK, 2 rows affected (0.313 sec)

Records: 2  Duplicates: 0  Warnings: 0

MariaDB [tpch1]> select * from bug4594;

+------+

| c1   |

+------+

| abc  |

| def  |

+------+

2 rows in set (0.044 sec)

MariaDB [tpch1]> select calshowpartitionsbyvalue('bug4594', 'c1', 'aa', 'zz') into @y;

ERROR 1815 (HY000): Internal error: MCS-1016: The column type CHAR(15) is currently  not supported in calShowPartitionsByValue function.