robertwb commented on a change in pull request #13202:
URL: https://github.com/apache/beam/pull/13202#discussion_r517736663
##########
File path:
sdks/python/apache_beam/runners/portability/fn_api_runner/translations.py
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@@ -1166,6 +1173,36 @@ def unlifted_stages(stage):
yield stage
+def _lowest_common_ancestor(a, b, context):
+ # type: (str, str, TransformContext) -> Optional[str]
+
+ '''Returns the name of the lowest common ancestor of the two named stages.
+
+ The provided context is used to compute ancestors of stages. Note that stages
+ are considered to be ancestors of themselves.
+ '''
+ assert a != b
+
+ parents = {
Review comment:
Yeah, this is an issue with yapf.
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