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https://issues.apache.org/jira/browse/SPARK-10915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583638#comment-15583638
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Davies Liu commented on SPARK-10915:
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Currently all the aggregate functions are implemented in Scala, which execute
one row at a time. This will not work for Python UDAF, the overhead between JVM
and Python process will make it super slow.
> 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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