y1chi commented on a change in pull request #14095:
URL: https://github.com/apache/beam/pull/14095#discussion_r583875550



##########
File path: 
sdks/python/apache_beam/runners/portability/fn_api_runner/execution.py
##########
@@ -443,23 +661,22 @@ def _make_safe_windowing_strategy(self, id):
     windowing_strategy_proto = 
self.pipeline_components.windowing_strategies[id]
     if windowing_strategy_proto.window_fn.urn in SAFE_WINDOW_FNS:
       return id
-    elif (windowing_strategy_proto.merge_status ==
-          beam_runner_api_pb2.MergeStatus.NON_MERGING) or True:
+    else:
       safe_id = id + '_safe'
       while safe_id in self.pipeline_components.windowing_strategies:
         safe_id += '_'
       safe_proto = copy.copy(windowing_strategy_proto)
-      safe_proto.window_fn.urn = GenericNonMergingWindowFn.URN
-      safe_proto.window_fn.payload = (
-          windowing_strategy_proto.window_coder_id.encode('utf-8'))
+      if (windowing_strategy_proto.merge_status ==
+          beam_runner_api_pb2.MergeStatus.NON_MERGING):
+        safe_proto.window_fn.urn = GenericNonMergingWindowFn.URN
+        safe_proto.window_fn.payload = (
+            windowing_strategy_proto.window_coder_id.encode('utf-8'))
+      else:

Review comment:
       Since there will be MergeStatus.ALREADY_MERGED, should we address that 
as well?
   I guess the implementation of  GenericMergingWindowFn handles custom window 
fn for python sdk only, should we throw exception here saying it is not 
supported yet when the ULR receives a window fn urn other than 
'beam:window_fn:pickled_python:v1'? I think this could happen in tests using 
java with ULR or xlang.




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