Unsupported auto_increment error is coming from Innodb engine

Columnstore doesn't support CREATE TABLE with auto_increment. But when someone executes it the error msg seems to come from Innodb engine.

CREATE TABLE t1 (a INT auto_increment) ENGINE=Columnstore;
ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key

Appropriate error msg should come from Columnstore engine.