This only happend when using an ORDER BY on a primary key part, where all other key parts where constant.
Remove of duplicated expressions in ORDER BY (as the old code did this in some strange cases)


mysql-test/r/group_by.result:
  Fixed results to take into account that duplicate order by parts are now deleted
mysql-test/r/group_by_innodb.result:
  Ensure extended keys are on
mysql-test/r/innodb_ext_key.result:
  More tests
mysql-test/r/order_by.result:
  More tests
mysql-test/t/group_by.test:
  Fixed results to take into account that duplicate order by parts are now deleted
mysql-test/t/group_by_innodb.test:
  Ensure extended keys are on
mysql-test/t/innodb_ext_key.test:
  More tests
mysql-test/t/order_by.test:
  More tests
sql/sql_select.cc:
  Fixed bug where we looked at extended key parts when we shouldn't
  Remove of duplicated expressions in ORDER BY
sql/table.cc:
  Indentation fixes