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https://issues.apache.org/jira/browse/SPARK-10915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15592831#comment-15592831
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Jason White commented on SPARK-10915:
-------------------------------------
At the moment, we use .repartitionAndSortWithinPartitions to give us a strictly
ordered iterable that we can process one at a time. We don't have a Python list
sitting in memory, instead we rely on ExternalSort to order in a memory-safe
way.
I don't yet have enough experience with DataFrames to know if we will have the
same or similar problems there. It's possible that collect_list will perform
better - I'll give that a try when we get there and report back on this ticket
if it's a suitable approach for our use case.
> 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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