ALTER Column varchar | Not Supported

CREATE TABLE `t1` (

  `id` int(11) DEFAULT NULL,

  `name1` char(10) DEFAULT NULL COMMENT 'test name',

  `name2` varchar(100) DEFAULT NULL COMMENT 'test name'

) ENGINE=Columnstore DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_general_ci;

# Works

ALTER TABLE t1 CHANGE COLUMN id id1 INT;

ALTER TABLE t1 CHANGE COLUMN id1 id INT COMMENT 'new comment';

# Fails

ALTER TABLE t1 CHANGE COLUMN name1 firstname char(10);

ALTER TABLE t1 CHANGE COLUMN firstname firstname char(10) COMMENT 'new comment';

# Fails

ALTER TABLE t1 CHANGE COLUMN name2 lastname char(10);

ALTER TABLE t1 CHANGE COLUMN lastname lastname  char(10) COMMENT 'new comment';

ERROR 1815 (HY000): Internal error: CAL0001: Alter table Failed:  Changing the datatype of a column is not supported