If you have an "Users" table in your app, and only the "owner" of those rows is able to see his/her own rows, you can read the user's name who is using the app as it's coming from another table. If you try to read the name from those filtered rows, even it's the same for all of them, it won't work. The reason behind of this is.. the name can be different on row basis and app doesn't know which one to choose.
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