override get_view_names in PrestoEngineSpec (#6459)

* override get_view_names in PrestoEngineSpec

* add test

* flake 8

* flake 8

superset/db_engine_specs.py

@@ -686,6 +686,16 @@ class PrestoEngineSpec(BaseEngineSpec):
             date_add('day', 1, CAST({col} AS TIMESTAMP))))",
     }
 
+    @classmethod
+    def get_view_names(cls, inspector, schema):
+        """Returns an empty list
+
+        get_table_names() function returns all table names and view names,
+        and get_view_names() is not implemented in sqlalchemy_presto.py
+        https://github.com/dropbox/PyHive/blob/e25fc8440a0686bbb7a5db5de7cb1a77bdb4167a/pyhive/sqlalchemy_presto.py
+        """
+        return []
+
     @classmethod
     def adjust_database_uri(cls, uri, selected_schema=None):
         database = uri.database

tests/db_engine_specs_test.py

@@ -1,5 +1,7 @@
 import inspect
 
+import mock
+
 from superset import db_engine_specs
 from superset.db_engine_specs import (
     BaseEngineSpec, HiveEngineSpec, MssqlEngineSpec,
@@ -284,3 +286,9 @@ class DbEngineSpecsTestCase(SupersetTestCase):
                 defined_time_grains = {grain.duration for grain in cls.get_time_grains()}
                 intersection = time_grains.intersection(defined_time_grains)
                 self.assertSetEqual(defined_time_grains, intersection, cls_name)
+
+    def test_presto_get_view_names_return_empty_list(self):
+        self.assertEquals([], PrestoEngineSpec.get_view_names(mock.ANY, mock.ANY))
+
+    def test_hive_get_view_names_return_empty_list(self):
+        self.assertEquals([], HiveEngineSpec.get_view_names(mock.ANY, mock.ANY))