tvalentyn commented on code in PR #24834:
URL: https://github.com/apache/beam/pull/24834#discussion_r1081979119
##########
sdks/python/apache_beam/transforms/util.py:
##########
@@ -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')
Review Comment:
```suggestion
'All input PCollections must belong to the same pipeline.')
```
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