[jira] [Commented] (SPARK-15780) Support mapValues on KeyValueGroupedDataset

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-15780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15316701#comment-15316701 ] 

Apache Spark commented on SPARK-15780:
--------------------------------------

User 'koertkuipers' has created a pull request for this issue:
https://github.com/apache/spark/pull/13526

> Support mapValues on KeyValueGroupedDataset
> -------------------------------------------
>
>                 Key: SPARK-15780
>                 URL: https://issues.apache.org/jira/browse/SPARK-15780
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: koert kuipers
>            Priority: Minor
>
> Currently when doing groupByKey on a Dataset the key ends up in the values which can be clumsy:
> {noformat}
> val ds: Dataset[(K, V)] = ...
> val grouped: KeyValueGroupedDataset[(K, (K, V))] = ds.groupByKey(_._1)
> {noformat}
> With mapValues one can create something more similar to PairRDDFunctions[K, V]:
> {noformat}
> val ds: Dataset[(K, V)] = ...
> val grouped: KeyValueGroupedDataset[(K, V)] = ds.groupByKey(_._1).mapValues(_._2)
> {noformat}



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