Add DataStax Fluent API module

Author: aboudreault

build.yaml

@@ -138,7 +138,7 @@ schedules:
     schedule: adhoc
     disable_pull_requests: true
     branches:
-      include: ['oss-next']
+      include: [/oss-next.*/]
     env_vars: |
       EVENT_LOOP_MANAGER='libev'
       EXCLUDE_LONG=1

cassandra/cluster.py

@@ -2522,7 +2522,8 @@ def execute(self, query, parameters=None, timeout=_NOT_SET, trace=False,
         not yet connected, the query will fail with :class:`NoHostAvailable`. Using this is
         discouraged except in a few cases, e.g., querying node-local tables and applying schema changes.
 
-        `execute_as` the user that will be used on the server to execute the request.
+        `execute_as` the user that will be used on the server to execute the request. This is only available
+        on a DSE cluster.
         """
 
         return self.execute_async(query, parameters, trace, custom_payload, timeout, execution_profile, paging_state, host, execute_as).result()

cassandra/datastax/graph/__init__.py

@@ -20,15 +20,3 @@
     graph_result_row_factory, graph_graphson2_row_factory
 )
 from cassandra.datastax.graph.graphson import *
-
-
-HAVE_GREMLIN = False
-try:
-    import gremlin_python
-    HAVE_GREMLIN = True
-except ImportError:
-    # gremlinpython is not installed.
-    pass
-
-if HAVE_GREMLIN:
-    from cassandra.datastax.graph._dse_graph import *