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https://issues.apache.org/jira/browse/BEAM-526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546152#comment-17546152
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Kenneth Knowles commented on BEAM-526:
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This issue has been migrated to https://github.com/apache/beam/issues/18040
> Mismatched pipelines give unclear error
> ---------------------------------------
>
> Key: BEAM-526
> URL: https://issues.apache.org/jira/browse/BEAM-526
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Ahmet Altay
> Priority: P3
> Labels: starter
>
> 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
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