ihji commented on code in PR #17280:
URL: https://github.com/apache/beam/pull/17280#discussion_r852360778
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sdks/python/apache_beam/transforms/external.py:
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@@ -433,6 +434,9 @@ def __init__(self, urn, payload, expansion_service=None):
self._inputs = {} # type: Dict[str, pvalue.PCollection]
self._outputs = {} # type: Dict[str, pvalue.PCollection]
+ def with_output_types(self, *args, **kwargs):
Review Comment:
Without it, the default implementation only allows a single argument.
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