DEFAULT is erroneously copied in `CREATE..SELECT column`

CREATE OR REPLACE TABLE t1 (a VARCHAR(10) DEFAULT 'x');

CREATE OR REPLACE TABLE t2 AS SELECT a FROM t1;

SHOW CREATE TABLE t2;

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

| Table | Create Table                                                                             |

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

| t2    | CREATE TABLE `t2` (

  `a` varchar(10) DEFAULT 'x'

) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

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