fix: handle duplicate groupby keys (#8658)

* fix: handle duplicate groupby keys

* Also de-duping upfront

superset/connectors/sqla/models.py

@@ -721,6 +721,9 @@ class SqlaTable(Model, BaseDatasource):
         groupby_exprs_sans_timestamp: OrderedDict = OrderedDict()
 
         if groupby:
+            # dedup columns while preserving order
+            groupby = list(dict.fromkeys(groupby))
+
             select_exprs = []
             for s in groupby:
                 if s in cols:

superset/viz.py

@@ -970,6 +970,10 @@ class BubbleViz(NVD3Viz):
         d["groupby"] = [form_data.get("entity")]
         if form_data.get("series"):
             d["groupby"].append(form_data.get("series"))
+
+        # dedup groupby if it happens to be the same
+        d["groupby"] = list(dict.fromkeys(d["groupby"]))
+
         self.x_metric = form_data.get("x")
         self.y_metric = form_data.get("y")
         self.z_metric = form_data.get("size")