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https://issues.apache.org/jira/browse/SPARK-16683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15831878#comment-15831878
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Andrew Ray commented on SPARK-16683:
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I'm working on a solution for this
> Group by does not work after multiple joins of the same dataframe
> -----------------------------------------------------------------
>
> Key: SPARK-16683
> URL: https://issues.apache.org/jira/browse/SPARK-16683
> Project: Spark
> Issue Type: Bug
> Components: Optimizer
> Affects Versions: 1.6.0, 1.6.1, 1.6.2, 2.0.0
> Environment: local and yarn
> Reporter: Witold Jędrzejewski
> Attachments: code_2.0.txt, Duplicates Problem Presentation.json
>
>
> When I join a dataframe, group by a field from it, then join it again by
> different field and group by field from it, second aggregation does not
> trigger.
> Minimal example showing the problem is attached as the text to paste into
> spark-shell (code_2.0.txt).
> The detailed description and minimal example, workaround and possible cause
> are in the attachment, in a form of Zeppelin notebook.
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