Hi John, The semantics of a count window depend on the order of rows which is specified by the "on" keyword. Without the order of rows, a count window would not be fully specified and might return arbitrary groups of rows.
Best, Fabian 2017-06-14 12:03 GMT+02:00 方孝健(玄弟) <xiaojian....@alibaba-inc.com>: > Hi devs, The Row-Count-Window must require proctime at Table API, and > the definiton for Row-Count-Window like the [1].In fact I don't understand > it. The countWindow is based on a window (range) of preceding and > succeeding rows, but not the time. Thedefinition [2] for Row-Count-Window > maybe > friendly for users. [1] ".rowWindow(TumbleRows over 10.rows on > ‘proctime as ‘w)". [2] .rowWindow(TumbleRows over 10.rows as ‘w) > Thanks, > John Fang > ------------------------------------------------------------------发件人：方孝健(玄弟) > <xiaojian....@alibaba-inc.com>发送时间：2017年6月14日(星期三) 17:46收件人：flink-dev < > flink-...@list.alibaba-inc.com>主 题：why the Row-Count-Window require > proctime? > Hi devs, The Row-Count-Window must require proctime at Table API, and > the definiton for Row-Count-Window like the [1].In fact I don't understand > it. The countWindow is based on a window (range) of preceding and > succeeding rows, but not the time. Thedefinition [2] > for Row-Count-Window maybe friendly for users. > [1] ".rowWindow(TumbleRows over 10.rows on ‘proctime as ‘w)". > [2] .rowWindow(TumbleRows over 10.rows as ‘w) > Thanks, > John Fang
