Can't decode dbobject fields from database with CL8MSWIN1251 character set

[golubovai]

1. What versions are you using?
   Oracle Database 19c (NLS_CHARACTERSET = CL8MSWIN1251)
   platform.platform: Windows-11-10.0.22631-SP0
   sys.maxsize > 2**32: True
   platform.python_version: 3.12.4
   oracledb.version: 2.3.0b1 (commit: c5c6b4f)

3. Is it an error or a hang or a crash?
   It's error

4. What error(s) or behavior you are seeing?
   File "src\oracledb\impl/thin/dbobject.pyx", line 489, in oracledb.thin_impl.ThinDbObjectImpl.get_attr_value
   File "src\oracledb\impl/thin/dbobject.pyx", line 192, in oracledb.thin_impl.ThinDbObjectImpl._ensure_unpacked
   File "src\oracledb\impl/thin/dbobject.pyx", line 308, in oracledb.thin_impl.ThinDbObjectImpl._unpack_data
   File "src\oracledb\impl/thin/dbobject.pyx", line 346, in oracledb.thin_impl.ThinDbObjectImpl._unpack_data_from_buf
   File "src\oracledb\impl/thin/dbobject.pyx", line 377, in oracledb.thin_impl.ThinDbObjectImpl._unpack_value
   File "src\oracledb\impl/base/buffer.pyx", line 746, in oracledb.base_impl.Buffer.read_str
   UnicodeDecodeError: 'utf-8' codec can't decode byte 0xdf in position 0: unexpected end of data

5. Does your application call init_oracle_client()?
   No, Thin

6. Include a runnable Python script that shows the problem.

import oracledb

def main():
    oracledb.defaults.config_dir = ''
    with oracledb.connect(user='', password='', dsn='', mode=oracledb.AUTH_MODE_SYSDBA) as c:
        with c.cursor() as cur:
            sql = "select sys.tts_error_t('Я') from dual"
            for v in cur.execute(sql):
                print(v[0].VIOLATIONS)
                
                
if __name__ == "__main__":
    main()

[golubovai]

xmltype has same error:

import oracledb


def main():
    oracledb.defaults.config_dir = ""
    with oracledb.connect(user='', password='', dsn='', mode=oracledb.AUTH_MODE_SYSDBA) as c:
        with c.cursor() as cur:
            sql = "select xmltype('<a>Я</a>') from dual"
            for v in cur.execute(sql):
                print(v[0])


if __name__ == "__main__":
    main()

[anthony-tuininga]

Thanks, can you share the packets containing the cursor execution for one of these two scenarios? That might be helpful. I can compare with the case when the database character set is AL32UTF8 and see what is going on. I'll try to get a database set up with that character set to see if I can replicate.

[golubovai]

packets.txt

[anthony-tuininga]

Thanks, that was helpful. I can see that in your output the string inside the object is encoded in windows-1251 (0xDF) while in my output the object is encoded in utf-8 (0xD0 0xAF). It looks like the conversion is not occurring in the server -- which suggests that this is a database bug. I'll ask internally and get back to you.

[golubovai]

Ok, thank you, I'll wait for the problem to be resolved, because we are using such databases with object types.