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https://issues.apache.org/jira/browse/BEAM-11710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17348642#comment-17348642
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Beam JIRA Bot commented on BEAM-11710:
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This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> 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: P3
> 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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