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https://issues.apache.org/jira/browse/BEAM-13968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on BEAM-13968 stopped by Andy Ye.
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> Implement len(GroupBy) and ngroups for DataFrame API
> ----------------------------------------------------
>
> Key: BEAM-13968
> URL: https://issues.apache.org/jira/browse/BEAM-13968
> Project: Beam
> Issue Type: Sub-task
> Components: dsl-dataframe, sdk-py-core
> Reporter: Andy Ye
> Assignee: Andy Ye
> Priority: P3
> Labels: dataframe-api
>
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