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https://issues.apache.org/jira/browse/SPARK-2278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-2278.
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Resolution: Not a Problem
I think the fix here is a doc fix, and that is covered by SPARK-2280
> groupBy & groupByKey should support custom comparator
> -----------------------------------------------------
>
> Key: SPARK-2278
> URL: https://issues.apache.org/jira/browse/SPARK-2278
> Project: Spark
> Issue Type: New Feature
> Components: Java API
> Affects Versions: 1.0.0
> Reporter: Hans Uhlig
>
> To maintain parity with MapReduce you should be able to specify a custom key
> equality function in groupBy/groupByKey similar to sortByKey.
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