yifanmai opened a new pull request #13549: URL: https://github.com/apache/beam/pull/13549
Fixes a bug introduced by #13202 where the parent for a fused stage (or
packed combiner) gets set to `None` if more than two stages are fused (or
packed). This occurs because `_lowest_common_ancestor` uses the `subtransforms`
field of the `PipelineContext`'s transforms to figure out parent-child
relationships. However, a stage that is created by fusion or by another
optimizer phase will not be present in the `PipelineContext`'s transforms. As a
result, such a stage is passed to `_lowest_common_ancestor`, it will return
`None`. This change fixes it by additionally using the `parent` field of the
input stages.
This bug only affects runners that use `translations.pipeline_from_stages`
with `partial=True`.
------------------------
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