Hi Tang Yun,
I agree with the point you mentioned that align these internal behavior
to return empty iterator instead of null. In my opinion,
StateMapViewWithKeysNullable handle nullable map keys, and result of
internal map state should be empty map in the null behavior case. Therefore,
as you mentioned, #iterator() should better return empty iterator.Thanks, Nicholas Jiang -- Sent from: http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/
