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https://issues.apache.org/jira/browse/SPARK-18932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15766342#comment-15766342
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Apache Spark commented on SPARK-18932:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/16371
> Partial aggregation for collect_set / collect_list
> --------------------------------------------------
>
> Key: SPARK-18932
> URL: https://issues.apache.org/jira/browse/SPARK-18932
> Project: Spark
> Issue Type: Improvement
> Components: SQL, Structured Streaming
> Reporter: Michael Armbrust
>
> The lack of partial aggregation here is blocking us from using these in
> streaming. It still won't be fast, but it would be nice to at least be able
> to use them.
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