Direct system table modifications are not completely prohibited
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Key: CORE-5567
URL: http://tracker.firebirdsql.org/browse/CORE-5567
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 3.0.2, 3.0.1, 3.0.0, 4.0 Initial
Reporter: Dmitry Yemanov
SQL> create database '/work/data/systab.fdb';
SQL> create domain my_type numeric(18, 2);
SQL> commit;
SQL> show domain MY_TYPE;
MY_TYPE NUMERIC(18, 2) Nullable
SQL> update rdb$fields set rdb$field_scale = -3 where rdb$field_name =
'MY_TYPE';
Statement failed, SQLSTATE = 42000
UPDATE operation is not allowed for system table RDB$FIELDS
-- THIS IS EXPECTED
SQL> rollback;
SQL> show domain MY_TYPE;
MY_TYPE NUMERIC(18, 2) Nullable
SQL> set term ^;
SQL> execute block as
CON> begin
CON> update rdb$fields set rdb$field_scale = -3 where rdb$field_name =
'MY_TYPE';
CON> end^
Statement failed, SQLSTATE = 42000
UPDATE operation is not allowed for system table RDB$FIELDS
-At block line: 3, col: 1
-- ALSO EXPECTED
SQL> set term ;^
SQL> rollback;
SQL> show domain MY_TYPE;
MY_TYPE NUMERIC(18, 2) Nullable
SQL> set term ^;
SQL> execute block as
CON> declare procedure hack as
CON> begin
CON> update rdb$fields set rdb$field_scale = -3 where rdb$field_name =
'MY_TYPE';
CON> end
CON> begin
CON> execute procedure hack;
CON> end^
SQL> set term ;^
SQL> commit;
SQL> show domain MY_TYPE;
MY_TYPE NUMERIC(18, 3) Nullable
-- WTF???
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