Wrong error message when executing ALTER ROLE without ALTER ANY ROLE
--------------------------------------------------------------------
Key: CORE-6490
URL: http://tracker.firebirdsql.org/browse/CORE-6490
Project: Firebird Core
Issue Type: Bug
Affects Versions: 4.0 RC 1, 3.0.7
Reporter: Mark Rotteveel
A user executing ALTER ROLE without ALTER ANY ROLE privilege is shown the wrong
error message.
Current behaviour:
```
alter role rdb$admin set auto admin mapping;
Statement failed, SQLSTATE = 28000
unsuccessful metadata update
-CREATE OR ALTER MAPPING AutoAdminImplementationMapping failed
-Unable to perform operation
-System privilege CHANGE_MAPPING_RULES is missing
```
The error indicates that executing ALTER ROLE was allowed, but only the attempt
to then create a mapping fails.
As error message I would expect:
"""
Statement failed, SQLSTATE = 28000
unsuccessful metadata update
-ALTER ROLE RDB$ADMIN failed
-no permission for ALTER access to ROLE RDB$ADMIN
-Effective user is TESTUSER
"""
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