Ensure external table node should be visible only for GPDB. Fixes #3548

web/pgadmin/browser/server_groups/servers/databases/external_tables/__init__.py

@@ -67,6 +67,7 @@ class ExternalTablesModule(CollectionNodeModule):
 
         super(ExternalTablesModule, self).__init__(*args, **kwargs)
         self.max_ver = 0
+        self.server_type = ['gpdb']
 
     def get_nodes(self, gid, sid, did):
         yield self.generate_browser_collection_node(did)

web/pgadmin/browser/server_groups/servers/databases/external_tables/tests/test_external_tables_module.py

@@ -33,6 +33,16 @@ class TestExternalTablesModule(BaseTestGenerator):
              ),
              expected_result=False,
          )),
+        ('#BackendSupported When access the on a Postgres Plus Advance Server '
+         'Database, it returns false',
+         dict(
+             test_type='backend-support',
+             manager=dict(
+                 server_type='ppas',
+                 sversion=90100
+             ),
+             expected_result=False,
+         )),
         ('#BackendSupported When access the on a GreenPlum Database, '
          'it returns true',
          dict(