[drupal-devel] db_rewrite_sql hook

The db_rewrite_sql hook is not yet documented at Drupaldocs. I'm trying to figure out the best way to fix taxonomy.module so that it only shows terms which are associated with nodes which the user has access to. Károly Négyesi's rewrite patch (http://drupal.org/node/16452) gets us part of the way but it seems that a db_rewrite_sql hook needs to be added to his patch. Is this something you can address, perhaps in a different patch if necessary, Károly?