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https://issues.apache.org/jira/browse/SPARK-22274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Takuya Ueshin resolved SPARK-22274.
-----------------------------------
Resolution: Fixed
Fix Version/s: 2.4.0
Issue resolved by pull request 19872
[https://github.com/apache/spark/pull/19872]
> User-defined aggregation functions with pandas udf
> --------------------------------------------------
>
> Key: SPARK-22274
> URL: https://issues.apache.org/jira/browse/SPARK-22274
> Project: Spark
> Issue Type: Sub-task
> Components: PySpark
> Affects Versions: 2.2.0
> Reporter: Li Jin
> Assignee: Li Jin
> Priority: Major
> Fix For: 2.4.0
>
>
> This function doesn't implement partial aggregation and shuffles all data. A
> uadf that supports partial aggregation is not covered by this Jira.
> Exmaple:
> {code:java}
> @pandas_udf(DoubleType())
> def mean(v)
> return v.mean()
> df.groupby('id').apply(mean(df.v1), mean(df.v2))
> {code}
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