Mismatched pipelines give unclear error #18040
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bug
core
done & done
Issue has been reviewed after it was closed for verification, followups, etc.
good first issue
P3
python
Milestone
Mistakenly mixing two pipeline gives an unclear error. This is an error, however we should improve the error message.
This could be reproduced by trying to flatten two things from different pipelines.
Improve the message for this assert:
https://github.com/aaltay/incubator-beam/blob/python-sdk/sdks/python/apache_beam/transforms/util.py#L135
Imported from Jira BEAM-526. Original Jira may contain additional context.
Reported by: altay.
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