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https://issues.apache.org/jira/browse/SPARK-25328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16602639#comment-16602639
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Hyukjin Kwon commented on SPARK-25328:
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[~smilegator], Maybe do you refer this test case
https://github.com/apache/spark/pull/20295/files#diff-7c2fe8530271c0635fb99f7b49e0c4a4R4679
> Add a test case 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 any test case that have more
> than one columns as the grouping key.
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