title: How to use collect_set and collect_list functions in windowed aggregation in Spark 1.6?
body: <p>In Spark 1.6.0 / Scala, is there an opportunity to get <code>collect_list("colC")</code> or <code>collect_set("colC").over(Window.partitionBy("colA").orderBy("colB")</code>?</p>