Github user koertkuipers commented on a diff in the pull request: https://github.com/apache/spark/pull/13526#discussion_r71041725 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/KeyValueGroupedDataset.scala --- @@ -65,6 +65,46 @@ class KeyValueGroupedDataset[K, V] private[sql]( groupingAttributes) /** + * Returns a new [[KeyValueGroupedDataset]] where the given function has been applied to the + * data. The grouping key is unchanged by this. + * + * {{{ + * // Create values grouped by key from a Dataset[(K, V)] + * ds.groupByKey(_._1).mapValues(_._2) // Scala + * }}} + * @since 2.0.0 + */ + def mapValues[W: Encoder](func: V => W): KeyValueGroupedDataset[K, W] = { --- End diff -- i think the convention is spaces before, i will fix
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