1. dataStream window

        group window 

•                    time window 基于时间驱动

                                                                滚动时间窗口 tumble time window

                                                                滑动时间窗口 sliding time window

                                                                会话时间窗口 session time window

•                    count window 基于数据驱动 

                                                                滚动计数窗口 tumble count window

                                                                滑动计数窗口 sliding count window

 2. sql window 

•        group window （多对一）

                                                                滚动时间窗口 tumble time window

                                                                滑动时间窗口 sliding time window

                                                                会话时间窗口 session time window

•        over window  （多对多）

                                                                滚动窗口

                                                                计数窗口

•        window TVF (1.13~)              

                                                                sql tumble windw 滚动

                                                                sql  hop window 滑动

                                                                sql  session window 会话

                                                                sql cumulate window 累计

 window TVF 优点：                     

1.语法标准化

2.性能优化。（local-global优化，distinct 解热点优化，迟到数据处理，支持grouping sets,cube,rollup等函数）

3. 解决   window + early-fire  或者 group by(1天) + minibatch(1分钟) 使用场景