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https://issues.apache.org/jira/browse/SPARK-31182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhengruifeng resolved SPARK-31182.
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Resolution: Not A Problem
> PairRDD support aggregateByKeyWithinPartitions
> ----------------------------------------------
>
> Key: SPARK-31182
> URL: https://issues.apache.org/jira/browse/SPARK-31182
> Project: Spark
> Issue Type: Improvement
> Components: ML, Spark Core
> Affects Versions: 3.1.0
> Reporter: zhengruifeng
> Priority: Minor
>
> When implementing `RobustScaler`, I was looking for a way to guarantee that
> the {{QuantileSummaries in {{}}{{aggregateByKey}}{{}}}} are compressed before
> network communication.
> Then I only found a tricky method to work around (however not applied), and
> there was no method for this.
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