Jing Ge

@RocMarshal since you are working on FLIP-239, would you like to review this PR?

@qingwei91 would you like to do the following clean-up: 1. squash commits and please make sure the commit message follows Flink rule. 2. rebase to the master. 3. Replace "[Flink...

Hi @qingwei91 It would be great if you could squash three commits into one. The PR title just missed "-".

@MartijnVisser 1.16 branch has been cut today. This PR could be merged now. Thanks!

@PatrickRen Would you like to merge this PR? Thanks!

Could you please add test too? Thanks!

Could you rebase your branch?

> hi @JingGe , I have done with it, is that OK for you to merge this PR? thanks a lot. sure, let's wait until the CI passed

@lxliyou001 sure, would you like to squash your commits?

@liuyongvs Thanks for your effort. Would you please to squash the commits?