tests: reduce nested type/UDT depth to 12 for new CQL nesting limit

Scylla now caps the nesting depth of CQL expressions in the
parser, rejecting deeply nested literals with:
  SyntaxException code=2000 'expression nested too deeply'

Cap the deepest case at 12, the maximum depth the server now allows.

Caused by scylladb/scylladb commit e35c388 ('cql3: limit nesting depth
of function calls and CASTs in CQL parser') scylladb/scylladb@c27e322.

Author: sylwiaszunejko

tests/integration/standard/test_types.py

@@ -663,18 +663,20 @@ def test_can_insert_nested_tuples(self):
         s.encoder.mapping[tuple] = s.encoder.cql_encode_tuple
 
         # create a table with multiple sizes of nested tuples
+        # Note: Scylla limits CQL expression nesting depth to 12, so the
+        # deepest tuple tested here is 12 levels deep.
         s.execute("CREATE TABLE nested_tuples ("
                   "k int PRIMARY KEY, "
                   "v_1 frozen<%s>,"
                   "v_2 frozen<%s>,"
                   "v_3 frozen<%s>,"
-                  "v_32 frozen<%s>"
+                  "v_12 frozen<%s>"
                   ")" % (self.nested_tuples_schema_helper(1),
                          self.nested_tuples_schema_helper(2),
                          self.nested_tuples_schema_helper(3),
-                         self.nested_tuples_schema_helper(32)))
+                         self.nested_tuples_schema_helper(12)))
 
-        for i in (1, 2, 3, 32):
+        for i in (1, 2, 3, 12):
             # create tuple
             created_tuple = self.nested_tuples_creator_helper(i)
 

tests/integration/standard/test_udts.py

@@ -389,7 +389,7 @@ def test_can_insert_nested_registered_udts(self):
         with self._cluster_default_dict_factory() as c:
             s = c.connect(self.keyspace_name, wait_for_all_pools=True)
 
-            max_nesting_depth = 16
+            max_nesting_depth = 12
 
             # create the schema
             self.nested_udt_schema_helper(s, max_nesting_depth)
@@ -417,7 +417,7 @@ def test_can_insert_nested_unregistered_udts(self):
         with self._cluster_default_dict_factory() as c:
             s = c.connect(self.keyspace_name, wait_for_all_pools=True)
 
-            max_nesting_depth = 16
+            max_nesting_depth = 12
 
             # create the schema
             self.nested_udt_schema_helper(s, max_nesting_depth)
@@ -454,7 +454,7 @@ def test_can_insert_nested_registered_udts_with_different_namedtuples(self):
         with self._cluster_default_dict_factory() as c:
             s = c.connect(self.keyspace_name, wait_for_all_pools=True)
 
-            max_nesting_depth = 16
+            max_nesting_depth = 12
 
             # create the schema
             self.nested_udt_schema_helper(s, max_nesting_depth)