robertwb commented on a change in pull request #12185:
URL: https://github.com/apache/beam/pull/12185#discussion_r451894237
##########
File path:
sdks/python/apache_beam/runners/portability/fn_api_runner/fn_runner.py
##########
@@ -289,6 +289,8 @@ def create_stages(
phases=[
translations.annotate_downstream_side_inputs,
translations.fix_side_input_pcoll_coders,
+ translations.eliminate_common_siblings,
Review comment:
We could be able to annotate/recognize certain DoFns (e.g. by URN) for
which this deduplication would be safe to apply.
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