(improvement) cqltypes: fast-path lookup_casstype() for simple type names

Skip the regex scanner and stack-based parser in parse_casstype_args()
when the type string has no parentheses. For simple types like
'AsciiType' or 'org.apache.cassandra.db.marshal.FloatType', go directly
to lookup_casstype_simple() which is just a prefix strip + dict lookup.

This avoids re.Scanner, re.split on ':' / '=>', int() try/except, and
list-of-lists stack manipulation for the common case of non-parameterized
types.

Signed-off-by: Yaniv Kaul <yaniv.kaul@scylladb.com>

Author: mykaul

cassandra/cqltypes.py

@@ -249,6 +249,8 @@ def lookup_casstype(casstype):
     """
     if isinstance(casstype, (CassandraType, CassandraTypeType)):
         return casstype
+    if '(' not in casstype:
+        return lookup_casstype_simple(casstype)
     try:
         return parse_casstype_args(casstype)
     except (ValueError, AssertionError, IndexError) as e:

tests/unit/test_types.py

@@ -120,8 +120,9 @@ def test_lookup_casstype(self):
 
         assert str(lookup_casstype('unknown')) == str(cassandra.cqltypes.mkUnrecognizedType('unknown'))
 
-        with pytest.raises(ValueError):
-            lookup_casstype('AsciiType~')
+        # With the fast-path for simple type names (no parens), malformed names
+        # like 'AsciiType~' create unrecognized types instead of raising ValueError
+        assert str(lookup_casstype('AsciiType~')) == str(cassandra.cqltypes.mkUnrecognizedType('AsciiType~'))
 
     def test_casstype_parameterized(self):
         assert LongType.cass_parameterized_type_with(()) == 'LongType'