Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/1975#discussion_r83308572 --- Diff: flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/AllWindowedStream.scala --- @@ -361,38 +361,84 @@ class AllWindowedStream[T, W <: Window](javaStream: JavaAllWStream[T, W]) { /** * Applies an aggregation that that gives the maximum element of the window by - * the given position. When equality, returns the first. + * the given position. When equality, returns the first by default. */ def maxBy(position: Int): DataStream[T] = aggregate(AggregationType.MAXBY, - position) + position, true) /** * Applies an aggregation that that gives the maximum element of the window by - * the given field. When equality, returns the first. + * the given position. When equality, returns either the first or last one depending + * on the parameter setting. + */ + def maxBy(position: Int, first: Boolean): DataStream[T] = aggregate(AggregationType.MAXBY, + position, first) + + /** + * Applies an aggregation that that gives the maximum element of the window by + * the given field. When equality, returns the first by default. */ def maxBy(field: String): DataStream[T] = aggregate(AggregationType.MAXBY, - field) + field, true) + + /** + * Applies an aggregation that that gives the maximum element of the window by + * the given field. When equality, returns either the first or last one depending + * on the parameter setting. + */ + def maxBy(field: String, first: Boolean): DataStream[T] = aggregate(AggregationType.MAXBY, + field, first) /** * Applies an aggregation that that gives the minimum element of the window by - * the given position. When equality, returns the first. + * the given position. When equality, returns the first by default. */ def minBy(position: Int): DataStream[T] = aggregate(AggregationType.MINBY, - position) + position, true) /** - * Applies an aggregation that that gives the minimum element of the window by - * the given field. When equality, returns the first. + * Applies an aggregation that that gives the maximum element of the window by + * the given position. When equality, returns either the first or last one depending + * on the parameter setting. + */ + def minBy(position: Int, first: Boolean): DataStream[T] = aggregate(AggregationType.MINBY, + position, first) + + /** + * Applies an aggregation that that gives the maximum element of the window by + * the given field. When equality, returns the first by default. */ def minBy(field: String): DataStream[T] = aggregate(AggregationType.MINBY, - field) + field, true) + + /** + * Applies an aggregation that that gives the maximum element of the window by + * the given field. When equality, returns either the first or last one depending + * on the parameter setting. + */ + def minBy(field: String, first: Boolean): DataStream[T] = aggregate(AggregationType.MINBY, + field, first) + + private def aggregate(aggregationType: AggregationType, position: Int): DataStream[T] = { --- End diff -- This method may not be `private`. All public method of this class are declared stable `@Public` and may not be changed.
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