y1chi commented on a change in pull request #15441:
URL: https://github.com/apache/beam/pull/15441#discussion_r721796625
##########
File path:
sdks/python/apache_beam/runners/portability/fn_api_runner/execution.py
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@@ -111,15 +133,28 @@ def reset(self):
pass
-class ListBuffer(object):
+class ListBuffer:
"""Used to support parititioning of a list."""
def __init__(self, coder_impl):
- # type: (CoderImpl) -> None
- self._coder_impl = coder_impl
+ # type: (Optional[CoderImpl]) -> None
+ self._coder_impl = coder_impl or CoderImpl()
Review comment:
Got it.
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