Feature request - new option innodb_automatic_pk (default off, global/session)

During CREATE TABLE for InnoDB, automatically translate

-- FROM:

CREATE TABLE t1 (c2 INT) ENGINE=InnoDB;

-- TO:

CREATE TABLE t1 (_inv_PK SERIAL INVISIBLE PRIMARY KEY, c2 INT) ENGINE=InnoDB;

-- FROM:

ALTER TABLE t1 ADD PRIMARY KEY (`c2`);

-- TO:

ALTER TABLE t1 DROP COLUMN IF EXISTS _inv_PK, ADD PRIMARY KEY (`c2`);

It might be a good idea to modify or suppress warning "Can't DROP COLUMN `_inv_PK`" and to issue a warning that _inv_PK was created.