Commented by: Nick (nick)

still exists in 3.0.1

Commented by: @pavel-zotov

I see that you omit 'set term' and semicolon(s). Can you repeat following script in ISQL rather than in IDE ?
(of course, replace 'c:\temp', DB name and user/password with your settings)

set bail on;
set echo on;
shell if exist c:\temp\e30.fdb del /q /f c:\temp\e30.fdb;
create database 'localhost:c:\temp\e30.fdb' user sysdba password 'masterkey';
show version;

create table t (f integer);

set term ^;
create trigger t_bi for t active before insert position 0 as
begin
new.f = 0;
end
^
set term ;^

commit;

drop trigger t_bi;
alter table t alter f to ff;
commit;

drop database;

// Checked on WI-V3.0.1.32609 (release 3.0.1) and on fresh 3.0.2 snapshot: no errors.

Commented by: Nick (nick)

With turning ddl autocommit off (set autoddl off) I have:

Statement failed, SQLSTATE = 42000
unsuccessful metadata update
-ALTER TABLE T failed
-Column F from table T is referenced in T_BI
After line 20 in file script.sql