init

Avoiding JOIN in extended filter to fix MySQL Query Error 1054 (http://stackoverflow.com/questions/10556505/mysql-query-error-1054) on ezp installations without https://github.com/ezsystems/ezpublish-legacy/commit/24bd6d8b3992236a4b5f47852cf335b28b8d50f0
I think check for enabled is enough. No need to allow more possibilities.