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https://issues.apache.org/jira/browse/SPARK-10915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15592514#comment-15592514
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Davies Liu commented on SPARK-10915:
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[~jason.white] When a aggregate function is applied, the order of input rows is
not defined (even you have a order by before the aggregate). In case that the
order matters, you will have to use collect_list and UDF.
> Add support for UDAFs in Python
> -------------------------------
>
> Key: SPARK-10915
> URL: https://issues.apache.org/jira/browse/SPARK-10915
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Reporter: Justin Uang
>
> This should support python defined lambdas.
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