Hi everyone, Thanks for the discussion and votes.
So far the email[1] wants to make AppendingState#add refuse to add null element, received 3 approving votes, and there is no -1 votes: * Aljoscha * Yu Li * Yun Tang Therefore, I'm happy to announce that we'll apply this change and make AppendingState#add refuse to add null element. Thanks, everyone! [1] http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/DISCUSS-Make-AppendingState-add-refuse-to-add-null-element-td36493.html Best, Congxian
