Added TTL feature flag

Author: bereng

ttl_test.py

@@ -370,7 +370,8 @@ def _base_expiration_overflow_policy_test(self, default_ttl, policy):
         @jira_ticket CASSANDRA-14092 and CASSANDRA-14227
         """
         # Post 5.0 TTL may overflow in 2038 (legacy) or 2106 C14227
-        overflow_policy_applies = self.cluster.version() < '5.0' or datetime.date.today().year >= 2086
+        overflow_policy_applies = "EXTENDED_TTL_2106" != os.getenv("cassandra.use_oa_sstable_format", "LEGACY_TTL_2038")\
+                                  or datetime.date.today().year >= 2086
         MAX_TTL = 20 * 365 * 24 * 60 * 60  # 20 years in seconds
         default_time_to_live = MAX_TTL if default_ttl else None
         self.prepare(default_time_to_live=default_time_to_live)