Take this procedure, connect with SYSDBA.

SET TERM ^^ ;
CREATE OR ALTER PROCEDURE P_2
returns (
O_CHAR VarChar(200) character set utf8)
SQL SECURITY INVOKER
AS
declare variable i integer;
declare variable a integer;
declare variable o integer;
declare variable outer_v varchar(200) character set utf8;

declare function m (v varchar(10)) returns varchar(10) as
begin
return v || outer_v;
end

declare function myfunc (a2 integer) returns integer as
declare variable inner_char varchar(200);
begin
i = i + 1;
select current_user from rdb$database where current_user = 'SYSDBA' into :outer_v;
inner_char = m('test');
if (a2 = 4)
then a2 = myfunc(a2 + 1);
return a2 * :a * :i;
end

begin
/* i = 5;
i = package_test.MyFunction(2);
i = mult(4, 2);
o = myfunc(a);*/
outer_v = current_user;
o_char = outer_v;
end ^^
SET TERM ; ^^

When executing, it returns “S” for output parameter O_CHAR.

Now, recreate the procedure, but comments out the “declare functions”:

SET TERM ^^ ;
CREATE OR ALTER PROCEDURE P_2
returns (
O_CHAR VarChar(200) character set utf8)
SQL SECURITY INVOKER
AS
declare variable i integer;
declare variable a integer;
declare variable o integer;
declare variable outer_v varchar(200) character set utf8;

/* declare function m (v varchar(10)) returns varchar(10) as
begin
return v || outer_v;
end

declare function myfunc (a2 integer) returns integer as
declare variable inner_char varchar(200);
begin
i = i + 1;
select current_user from rdb$database where current_user = 'SYSDBA' into :outer_v;
inner_char = m('test');
if (a2 = 4)
then a2 = myfunc(a2 + 1);
return a2 * :a * :i;
end */

begin
/* i = 5;
i = package_test.MyFunction(2);
i = mult(4, 2);
o = myfunc(a);*/
outer_v = current_user;
o_char = outer_v;
end ^^
SET TERM ; ^^

execute again: the routine returns “SYSDBA”.

The lines executed are no different, but the result is now correct. At first I thought it had something to do with the character set, so I added the UTF8 thing everywhere, even though thats the default character set.