[jira] [Closed] (FLINK-8158) Rowtime window inner join emits late data

["Hequn Cheng (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-8158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hequn Cheng closed FLINK-8158.
------------------------------
    Resolution: Won't Do

> Rowtime window inner join emits late data
> -----------------------------------------
>
>                 Key: FLINK-8158
>                 URL: https://issues.apache.org/jira/browse/FLINK-8158
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API & SQL
>            Reporter: Hequn Cheng
>            Assignee: Hequn Cheng
>            Priority: Major
>         Attachments: screenshot-1xxx.png
>
>
> When executing the join, the join operator needs to make sure that no late data is emitted. Currently, this achieved by holding back watermarks. However, the window border is not handled correctly. For the sql bellow: 
> {quote}
>     val sqlQuery =
>       """
>         SELECT t2.key, t2.id, t1.id
>         FROM T1 as t1 join T2 as t2 ON
>           t1.key = t2.key AND
>           t1.rt BETWEEN t2.rt - INTERVAL '5' SECOND AND
>             t2.rt + INTERVAL '1' SECOND
>         """.stripMargin
>     val data1 = new mutable.MutableList[(String, String, Long)]
>     // for boundary test
>     data1.+=(("A", "LEFT1", 6000L))
>     val data2 = new mutable.MutableList[(String, String, Long)]
>     data2.+=(("A", "RIGHT1", 6000L))
> {quote}
> Join will output a watermark with timestamp 1000, but if left comes with another data ("A", "LEFT1", 1000L), join will output a record with timestamp 1000 which equals previous watermark.



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