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https://issues.apache.org/jira/browse/SPARK-25328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16602649#comment-16602649
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Hyukjin Kwon commented on SPARK-25328:
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I replied some more details in the PR.
> Add an example for having two columns as the grouping key in group aggregate
> pandas UDF
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-25328
> URL: https://issues.apache.org/jira/browse/SPARK-25328
> Project: Spark
> Issue Type: Sub-task
> Components: PySpark
> Affects Versions: 2.4.0
> Reporter: Xiao Li
> Priority: Major
>
> https://github.com/apache/spark/pull/20295 added an alternative interface for
> group aggregate pandas UDFs. It does not have an example that have more than
> one columns as the grouping key in {{functions.py}}
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