guoweiM commented on pull request #13808:
URL: https://github.com/apache/flink/pull/13808#issuecomment-717821255
> +1 for merging from me as soon as AZP given green, but I think @aljoscha
's comments are not in the branch.
> I merged this, but I renamed all the builder
guoweiM commented on pull request #13808:
URL: https://github.com/apache/flink/pull/13808#issuecomment-717708815
> I have some comments that have mainly to do with unused methods and base
classes that can be made concrete. I have pushed my changes here (to make sure
that I do not break
