Some cluster tests use `cluster_con` when they need a different load
balancing policy or auth provider. However, no test uses a port
other than 9042 or enables SSL, but all tests must pass `9042, False`
because these parameters don't have default values. This makes the code
more verbose. Also, it's quite obvious that 9042 stands for port, but
it's not obvious what `False` is related to, so there is a need to check
the definition of `cluster_con` while reading any test that uses it.
No reason to backport, it's only a minor refactoring.
Closesscylladb/scylladb#25516
Implement corner-cases of prepared statement metadata, as described in
scylladb#20860.
Although the purpose of the test was to verify the newly implemented
SCYLLA_USE_METADATA_ID protocol extension, the test also passes with
scylla-driver 3.29.3 that doesn't implement the support for this
extension. That is because the driver doesn't implement support for
skip_metadata flag, so fresh metadata are included in every prepared
statement response, regardless of the metadata_id.
This change:
- Add test_changed_prepared_statement_metadata_columns to verify
a scenario when a number of columns changes in a table used by a
prepared statement
- Add test_changed_prepared_statement_metadata_types to verify
a scenario when a type of a column changes in a table used by a
prepared statement
- Add test_changed_prepared_statement_metadata_udt to veriy
a scenario when a UDT changes in a table used by a prepared statement
I tested the code with a modified Python driver
(ref. scylladb/python-driver#457):
- If SKIP_METADATA is enabled (scylladb/python-driver@c1809c1)
but not other changes are introduced, all three test cases fail.
- If SKIP_METADATA is disabled (no scylladb/python-driver@c1809c1) all
test cases pass because fresh metadata are included in each reply.
- If SKIP_METADATA is enabled (scylladb/python-driver@c1809c1)
and SCYLLA_USE_METADATA_ID extension is included
(scylladb/python-driver@8aba164) all test cases pass and verifies
the correctness the implementation.
