Fix bug #9314 in InnoDB true VARCHAR: InnoDB stored the 'position' of a row wrong in a column prefix primary key index; this could cause MySQL to complain 'ERROR 1032: Can't find record in ...' in an update of the primary key, and also some ORDER BY or DISTINCT queries


sql/ha_innodb.cc:
  Fix bug #9314 in InnoDB true VARCHAR: InnoDB stored the 'position' of a row wrong in a column prefix primary key index; this could cause MySQL to complain 'ERROR 1032: Can't find record in ...' in an update of the primary key, and also some ORDER BY or DISTINCT queries