>From "Relational Queries on Data Stream in Apache Flink" > Bounday Memory Requirements ( https://docs.google.com/document/d/1qVVt_16kdaZQ8RTfA_f4konQPW4tnl8THw6rzGUdaqU/edit# )
*SELECT user, page, COUNT(page) AS pCntFROM pageviews* *GROUP BY user, page* *-Versus-* *SELECT user, page, COUNT(page) AS pCntFROM pageviews* *WHERE rowtime BETWEEN now() - INTERVAL '1' HOUR AND now() // only last hour* *GROUP BY user, page* I understand: - Not use WaterMark to pre-calculate agrr, and save memory - Store all events "as is" until the end of window are My assumptions true ?
