BjornPrime commented on code in PR #24435:
URL: https://github.com/apache/beam/pull/24435#discussion_r1092164403


##########
sdks/python/apache_beam/transforms/core.py:
##########
@@ -2474,9 +2474,13 @@ def typed(transform):
       # Capture in closure (avoiding capturing self).
       args, kwargs = self.args, self.kwargs
 
+      #TODO: We need to add support for multi-window inputs to 
CombineGlobally()
       def inject_default(_, combined):
         if combined:
-          assert len(combined) == 1
+          if len(combined) > 1:
+            raise ValueError(
+                "Input from multiple simultaneous windows"
+                "isn't currently supported for CombineGlobally()")

Review Comment:
   If it can be repro'd w/ PubSub, that's also an issue that should be 
addressed. Do we need to do that to close the initial issue, or can that be its 
own issue?



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