Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/16758#discussion_r98775825
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/KeyValueGroupedDataset.scala ---
@@ -219,6 +219,160 @@ class KeyValueGroupedDataset[K, V] private[sql](
}
/**
+ * ::Experimental::
+ * (Scala-specific)
+ * Applies the given function to each group of data, while using an
additional keyed state.
--- End diff --
while maintaining some user-defined state for each key.
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