lukecwik commented on a change in pull request #12016:
URL: https://github.com/apache/beam/pull/12016#discussion_r448663612



##########
File path: sdks/python/apache_beam/runners/worker/bundle_processor.py
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@@ -1079,6 +1079,13 @@ def construct_bundle_application(self,
                                   ):
     # type: (...) -> beam_fn_api_pb2.BundleApplication
     transform_id, main_input_tag, main_input_coder, outputs = op.input_info
+    # The main_input_coder should be the main_input_coder of
+    # SdfTruncateSizedRestrictions if SdfProcessSizedElements is following
+    # SdfTruncateSizedRestrictions.
+    if (isinstance(op, operations.SdfProcessSizedElements) and

Review comment:
       I don't think this is necessary.
   
   The bundle application should have splits/residuals for the 
SdfProcessSizedElements and should use its input info and not the input info of 
the sdf_truncate_op. The runner can choose to feed the split back through the 
truncate operation or it can choose to feed the split directly to the 
SdfProcessSizedElements based upon how it chooses to construct the graph.




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