I'm not sure if this is actually etiquette or just common sense, but I would be interested in people's opinions.
Recently I have been going to a lot of job interviews, only to find out that there is already someone in the role (either a temp staff member or a more junior staff member who has been doing the work) and unsurprisingly they have been given the job once the interviews are complete. (It's compulsory to advertise positions in Victoria even if someone is basically doing them already, hence why this situation arises so frequently.)
My question is this: during the interview, is it considered rude to enquire whether there is already someone in the role? I would much rather know that there is a 'no' coming than wait eagerly for days and then be let down.