[GitHub] [beam] tvalentyn commented on a diff in pull request #24834: improve error message for mismatched pipelines

[GitBox <gi...@apache.org>]

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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