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improve error message for mismatched pipelines #24834

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Jan 20, 2023
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3 changes: 2 additions & 1 deletion sdks/python/apache_beam/transforms/util.py
Original file line number Diff line number Diff line change
Expand Up @@ -234,7 +234,8 @@ def expand(self, pcolls):
for pcoll in pcolls.values():
self._check_pcollection(pcoll)
if self.pipeline:
assert pcoll.pipeline == self.pipeline
assert pcoll.pipeline == self.pipeline, (
'mismatched pipelines, input PCollections must all belong to the same pipeline')
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tags = list(pcolls.keys())

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