Meaning https://github.com/matomo-org/matomo/blob/4.5.0-b2/core/Db/Adapter/Pdo/Mssql.php and https://github.com/matomo-org/matomo/blob/4.5.0-b2/core/Db/Adapter/Pdo/Pgsql.php

Since these are not supported can we remove them? It requires us on occasion to add core to these classes when we add methods to the other adapters and it confuses new developers thinking we might support them and that they need to be tested.

@mattab @sgiehl or do you know any reason why they still exist in the code?