Fix top groups with user defined metrics (#6073)

UPDATING.md

@@ -19,7 +19,7 @@ assists people when migrating to a new version.
 * Superset 0.28 upgrades `flask-login` to `>=0.3`, which includes a
     backwards-incompatible change: `g.user.is_authenticated`,
     `g.user.is_anonymous`, and `g.user.is_active` are now properties
-    instead of properties.
+    instead of methods.
 
 ## Superset 0.27.0
 * Superset 0.27 start to use nested layout for dashboard builder, which is not

superset/connectors/sqla/models.py

@@ -757,7 +757,11 @@ class SqlaTable(Model, BaseDatasource):
                     'order_desc': True,
                 }
                 result = self.query(subquery_obj)
-                dimensions = [c for c in result.df.columns if c not in metrics]
+                cols = {col.column_name: col for col in self.columns}
+                dimensions = [
+                    c for c in result.df.columns
+                    if c not in metrics and c in cols
+                ]
                 top_groups = self._get_top_groups(result.df, dimensions)
                 qry = qry.where(top_groups)