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

["koert kuipers (JIRA)" <ji...@apache.org>]

koert kuipers created SPARK-15780:
-------------------------------------

             Summary: 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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