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https://issues.apache.org/jira/browse/BEAM-11710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17296933#comment-17296933
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Beam JIRA Bot commented on BEAM-11710:
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This issue was marked "stale-assigned" and has not received a public comment in
7 days. It is now automatically unassigned. If you are still working on it, you
can assign it to yourself again. Please also give an update about the status of
the work.
> groupby cannot aggregate grouped column
> ---------------------------------------
>
> Key: BEAM-11710
> URL: https://issues.apache.org/jira/browse/BEAM-11710
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Affects Versions: 2.26.0, 2.27.0, 2.28.0
> Reporter: Brian Hulette
> Priority: P2
> Labels: dataframe-api
>
> pandas allows you to aggregate on the same column that you are grouping on.
> Attempting this in the Beam implementation results in an error.
> df.groupby('group')[['group', 'foo']].count()
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