[hotfix] fix iframe viz

superset/db_engine_specs.py

@@ -401,6 +401,18 @@ class PrestoEngineSpec(BaseEngineSpec):
                 row['table_schema'], row['table_name']))
         return result_sets
 
+    @classmethod
+    def extract_error_message(cls, e):
+        """Extract error message for queries"""
+        logging.error(e)
+        print("-="*100)
+        print("-="*100)
+        print("-="*100)
+        print("-="*100)
+        print(type(e))
+        print(dir(e))
+        return error_msg_from_exception(e)
+
     @classmethod
     def extra_table_metadata(cls, database, table_name, schema_name):
         indexes = database.get_indexes(table_name, schema_name)

superset/viz.py

@@ -1320,6 +1320,9 @@ class IFrameViz(BaseViz):
     credits = 'a <a href="https://github.com/airbnb/superset">Superset</a> original'
     is_timeseries = False
 
+    def get_df(self):
+       return None
+
 
 class ParallelCoordinatesViz(BaseViz):