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7 changes: 6 additions & 1 deletion sdks/python/apache_beam/io/gcp/experimental/spannerio.py
Original file line number Diff line number Diff line change
Expand Up @@ -898,7 +898,12 @@ class _Mutator(namedtuple('_Mutator',

@property
def byte_size(self):
return self.mutation.ByteSize()
if hasattr(self.mutation, '_pb'):
# google-cloud-spanner 3.x
return self.mutation._pb.ByteSize()
else:
# google-cloud-spanner 1.x
return self.mutation.ByteSize()


class MutationGroup(deque):
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