allow to select fields from related colllection

[endel]

Currently it is not possible to do the following:

hook.collection('memes').join('auth').select('_id', 'auth.email').then(...)

auth.email is not recognized, generating the following SQL error:

SQLSTATE[42S22]: Column not found: 1054 Unknown column \'app1_auth.email\' in \'field list\' (SQL: select `_id`, `app1_auth`.`email` from `app1_memes` where `app1_memes`.`deleted_at` is null order by `votes` desc limit 11)