def cxOracle_py3_bug(func):
    from unittest import expectedFailure
    from django.db import connection
    return expectedFailure(func) if connection.vendor == 'oracle' and six.PY3 else func
There's a bug in Django/cx_Oracle with respect to string handling under
dataset/ETHPy150Open django/django/tests/annotations/tests.py/cxOracle_py3_bug