external function declaration backup restore char_length missing

[myilmaznetsim]

1. create utf8 charset db, declare simple udf with cstring(10)
   look at RDB$FUNCTION_ARGUMENTS.RDB$CHARACTER_LENGTH value for this decl see 10

2. backup - restore new db
   look at RDB$FUNCTION_ARGUMENTS.RDB$CHARACTER_LENGTH value for this decl see NULL

sample test decl:
DECLARE EXTERNAL FUNCTION lower_c
VARCHAR (256)
RETURNS CSTRING(80) FREE_IT
ENTRY_POINT 'fn_lower_c' MODULE_NAME 'udflib';

Firebird 5.0.3

[asfernandes]

Real commands and logs, please.

[myilmaznetsim]

1. isql ------ CREATE DB ----------
   SET SQL DIALECT 3;
   CREATE DATABASE 'c:\wd\FUNCBACKUPTEST.FDB' PAGE_SIZE 8192 DEFAULT CHARACTER SET UTF8;
   COMMIT WORK;

DECLARE EXTERNAL FUNCTION LOWER_C
VARCHAR(256) CHARACTER SET UTF8
RETURNS CSTRING(80) CHARACTER SET UTF8 FREE_IT
ENTRY_POINT 'fn_lower_c' MODULE_NAME 'udflib';

COMMIT;

SELECT r.RDB$FUNCTION_NAME, r.RDB$CHARACTER_LENGTH
FROM RDB$FUNCTION_ARGUMENTS r
WHERE RDB$FUNCTION_NAME = 'LOWER_C';

RDB$FUNCTION_NAME RDB$CHARACTER_LENGTH
=============================================================== ====================
LOWER_C 80
LOWER_C 256

2. backup restore
   C:\Program Files\Firebird5.0>gbak c:\wd\FUNCBACKUPTEST.FDB stdout | gbak -rep stdin c:\wd\FUNCBACKUPTEST1.FDB

3. isql
   C:\Program Files\Firebird5.0>isql c:\wd\FUNCBACKUPTEST1.FDB
   Database: c:\wd\FUNCBACKUPTEST1.FDB, User: SYSDBA
   SQL> SELECT r.RDB$FUNCTION_NAME, r.RDB$CHARACTER_LENGTH
   CON> FROM RDB$FUNCTION_ARGUMENTS r
   CON> WHERE RDB$FUNCTION_NAME = 'LOWER_C';

RDB$FUNCTION_NAME RDB$CHARACTER_LENGTH
=============================================================== ====================
LOWER_C null
LOWER_C null