When use flink sql, we encounter a big problem to deal with sql state compatibility.Think we have a group agg sql like ```sqlselect sum(`a`) from source_t group by `uid```` But if i want to add a new agg column to ```sqlselect sum(`a`), max(`a`) from source_t group by `uid````Then sql state will not be compatible. Is there any on-going work/thoughts to improve this situation?
-- Sent from: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/
