aljoscha commented on a change in pull request #6784: [FLINK-7811] Add support
for Scala 2.12
URL: https://github.com/apache/flink/pull/6784#discussion_r227718201
##########
File path:
flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/DataStream.scala
##########
@@ -414,6 +414,22 @@ class DataStream[T](stream: JavaStream[T]) {
asScalaStream(new JavaKeyedStream(stream, keyExtractor, keyType))
}
+ /**
+ * Groups the elements of a DataStream by the given K key to
+ * be used with grouped operators like grouped reduce or grouped
aggregations.
+ */
+ def keyBy[K: TypeInformation](fun: KeySelector[T, K]): KeyedStream[T, K] = {
+
+ val cleanFun = clean(fun)
+ val keyType: TypeInformation[K] = implicitly[TypeInformation[K]]
+
+ val keyExtractor = new KeySelector[T, K] with ResultTypeQueryable[K] {
Review comment:
I don't think so, I'm changing it.
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