No application should have a dependency againt a database server, because the server may be installed on another host. The drupal-mysql and drupal-postgresql packages should not enforce dependencies against mysql or postgresql. Also, shipping 3 subpackages just to install a suitable database driver seems overkill. Similar applications usually just add a note in the README.urpmi file.
Assignee: bugsquad => oliver.bgr
Removed the dependancies for the database servers themselves, but kept the sub packages requiring the php-pdo_foo packages as drupal won't work without them. If you really don't like those sub packages, you are free to maintain drupal yourself and do whatever you want.
Status: NEW => RESOLVEDResolution: (none) => FIXED