check for DSE in schema-parsing

Author: mambocab

CHANGELOG.rst

@@ -1,3 +1,11 @@
+3.15.1
+======
+September 6, 2018
+
+Bug Fixes
+---------
+* C* 4.0 schema-parsing logic breaks running against DSE 6.0.X (PYTHON-1018)
+
 3.15.0
 ======
 August 30, 2018

cassandra/metadata.py

@@ -2720,7 +2720,9 @@ def export_as_string(self):
 
 def get_schema_parser(connection, server_version, timeout):
     server_major_version = int(server_version.split('.')[0])
-    if server_major_version >= 4:
+    # check for DSE version
+    has_build_version = len(server_version.split('.')) > 3
+    if server_major_version >= 4 and not has_build_version:
         return SchemaParserV4(connection, timeout)
     if server_major_version >= 3:
         return SchemaParserV3(connection, timeout)