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https://issues.apache.org/jira/browse/BEAM-11839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17338684#comment-17338684
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Brian Hulette commented on BEAM-11839:
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This was mostly addressed in pr/14566. There were a couple of TODOs there
around the agg method, which will be closed in
https://github.com/apache/beam/pull/14438
> Attach a "reason" message to Singleton partitioning
> ---------------------------------------------------
>
> Key: BEAM-11839
> URL: https://issues.apache.org/jira/browse/BEAM-11839
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py-core
> Reporter: Brian Hulette
> Priority: P2
> Labels: dataframe-api
> Time Spent: 8h 20m
> Remaining Estimate: 0h
>
> When Singleton partitioning is required, we should be able to attach a reason
> to it so we can raise a helpful message to the user later, e.g.
> {{partitionings.Singleton(reason="Only 'pearson' correlation can be computed
> in a distributed manner, other methods require Singleton partitioning")}}
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