[jira] [Commented] (SPARK-3655) Support sorting of values in addition to keys (i.e. secondary sort)

["Sandy Ryza (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-3655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14235758#comment-14235758 ] 

Sandy Ryza commented on SPARK-3655:
-----------------------------------

Hey [~koert], I think the transform that would most closely mimic MR-style secondary would be a groupByKeyAndSortValues.  Not that a foldBy transformation wouldn't be useful as well.  Do you have any interest in implementing the former?  If not, I'll have a go at it.

> Support sorting of values in addition to keys (i.e. secondary sort)
> -------------------------------------------------------------------
>
>                 Key: SPARK-3655
>                 URL: https://issues.apache.org/jira/browse/SPARK-3655
>             Project: Spark
>          Issue Type: New Feature
>          Components: Spark Core
>    Affects Versions: 1.1.0
>            Reporter: koert kuipers
>            Assignee: Koert Kuipers
>            Priority: Minor
>
> Now that spark has a sort based shuffle, can we expect a secondary sort soon? There are some use cases where getting a sorted iterator of values per key is helpful.



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