Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/12836#discussion_r61709084
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -1999,6 +1999,34 @@ class Dataset[T] private[sql](
}
/**
+ * Returns a new [[DataFrame]] which contains the aggregated result of
applying
+ * [[func]] R function to each group
+ *
+ * @group func
+ * @since 2.0.0
+ */
+ def mapGroupPartitionsInR[K: Encoder](
+ gfunc: T => K,
+ func: Array[Byte],
+ packageNames: Array[Byte],
+ broadcastVars: Array[Object],
+ outputSchema: StructType): DataFrame = {
+
+ val inputPlan = logicalPlan
+ val withGroupingKey = AppendColumns(gfunc, inputPlan)
+ val executed = sqlContext.executePlan(withGroupingKey)
+
+ val kvdg = new KeyValueGroupedDataset(
--- End diff --
What is `kvdg`?
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