CASSANDRA-8930 added a new flag to the native protocol responses, indicating the presence of warnings. Please see the ticket for more details.
We don't have access to the future in cqlsh, please see https://github.com/datastax/python-driver/pull/319 for more details.
I think it should work as-is. Please see discussion in Stefania's PR.
Assigning to Kishan to review current tests.