villebro commented on a change in pull request #13595:
URL: https://github.com/apache/superset/pull/13595#discussion_r593078968



##########
File path: superset/db_engine_specs/druid.py
##########
@@ -38,6 +52,14 @@ class DruidEngineSpec(BaseEngineSpec):  # pylint: 
disable=abstract-method
     allows_joins = False
     allows_subqueries = True
 
+    column_type_mappings = (
+        (
+            re.compile(r"^__time", re.IGNORECASE),

Review comment:
       It's actually the column name that is `__type`, not the type. So this 
needs to be picked up in `get_column_spec`, probably by adding the column name 
to the signature.




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