Problem with (empty result).update_all

[lopomaster]

Example: Model User: User.none.union(User.none).update_all(username: 'new username')

Setting username = 'new username' to all users of the database -> When User.none.union(User.none).count is equal to 0!

Rails version: Rails 5.0.5

Ruby version: ruby 2.5.3p105

Thanks