You would apply a assignTimestampsAndWatermarks() operation on the unioned
stream. However, this would not allow you to sort the join by timestamp, since
no sorting is supported out-of-box in Flink.
> On 26. Jul 2017, at 21:37, G.S.Vijay Raajaa <gsvijayraa...@gmail.com> wrote:
> I am having a union of 3 kafka topic stream, i am joining them by a timestamp
> field. I would like to order the join by timestamp. How do I assign a
> watermark and extract timestamp from a union stream?
> Vijay Raajaa GS