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https://issues.apache.org/jira/browse/SPARK-2278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14043694#comment-14043694
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Hans Uhlig commented on SPARK-2278:
-----------------------------------
See
http://hadoop.apache.org/docs/r2.3.0/api/org/apache/hadoop/mapreduce/Job.html#setGroupingComparatorClass(java.lang.Class)
for related MapReduce function.
> groupBy 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 similar to sortByKey.
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