robertwb commented on a change in pull request #12804:
URL: https://github.com/apache/beam/pull/12804#discussion_r486679692
##########
File path:
sdks/python/apache_beam/runners/portability/fn_api_runner/translations.py
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@@ -478,8 +478,10 @@ def leaf_transform_stages(
if root.spec.urn in known_composites:
yield Stage(root_id, [root], parent=parent)
elif not root.subtransforms:
- # Make sure its outputs are not a subset of its inputs.
- if set(root.outputs.values()) - set(root.inputs.values()):
+ # Yield if its outputs are not a subset of its inputs,
+ # or if it has no inputs and no outputs.
+ if set(root.outputs.values()) - set(root.inputs.values()) or \
Review comment:
The convention in Beam is to use ()'s rather than backslashes for
multi-line statements.
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