The wording for refusing a key in client input. Deliberately the SAME for a key that names a field the caller cannot read and a key that names no field at all, so the refusal cannot be used to learn which columns exist.
The wording for refusing a key in client input. Deliberately the SAME for a key that names a field the caller cannot read and a key that names no field at all, so the refusal cannot be used to learn which columns exist.