robertwb commented on a change in pull request #11185: [BEAM-8019] Some
generalizations to support cross-language transforms.
URL: https://github.com/apache/beam/pull/11185#discussion_r397543820
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File path: sdks/python/apache_beam/runners/dataflow/dataflow_runner.py
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@@ -380,7 +381,12 @@ def visit_transform(self, transform_node):
# pylint: disable=wrong-import-order, wrong-import-position
from apache_beam import Flatten
if isinstance(transform_node.transform, Flatten):
- output_pcoll = transform_node.outputs[None]
+ from apache_beam.runners.portability.fn_api_runner.translations \
+ import only_element
+ output_pcoll = (
+ transform_node.outputs[None] if None in transform_node.outputs
+ else only_element(transform_node.outputs.values()))
Review comment:
`only_element` is fine to use everywhere, no need to branch on the key being
None.
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