damccorm commented on code in PR #40683:
URL: https://github.com/apache/beam/pull/40683#discussion_r4325139504


##########
sdks/python/apache_beam/io/gcp/experimental/spannerio_read_perf_test.py:
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@@ -133,7 +134,8 @@ def make_insert_mutations(element):
           | 'Produce rows' >> Read(
               SyntheticSource(self.parse_synthetic_source_options()))
           | 'Format' >> Map(format_record)
-          | 'Make mutations' >> FlatMap(make_insert_mutations)
+          | 'Make mutations' >> FlatMap(
+              make_insert_mutations).with_output_types(_Mutator)

Review Comment:
   Do we know what change caused this to start failing? Did we make a breaking 
change to something?



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