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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (FLINK-6232) Support proctime inner equi-join between two streams in the SQL API
Date Tue, 18 Jul 2017 07:50:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-6232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Fabian Hueske closed FLINK-6232.
--------------------------------
       Resolution: Implemented
    Fix Version/s: 1.4.0

Implemented for 1.4.0 with ba6c59e6d744958db7332f88ffdd46effc9ad400 and 471345c0ea9930a582786cc08bd290d374b28c5a

> Support proctime inner equi-join between two streams in the SQL API
> -------------------------------------------------------------------
>
>                 Key: FLINK-6232
>                 URL: https://issues.apache.org/jira/browse/FLINK-6232
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: hongyuhong
>            Assignee: hongyuhong
>             Fix For: 1.4.0
>
>
> The goal of this issue is to add support for inner equi-join on proc time streams to
the SQL interface.
> Queries similar to the following should be supported:
> {code}
> SELECT o.proctime, o.productId, o.orderId, s.proctime AS shipTime 
> FROM Orders AS o 
> JOIN Shipments AS s 
> ON o.orderId = s.orderId 
> AND o.proctime BETWEEN s.proctime AND s.proctime + INTERVAL '1' HOUR;
> {code}
> The following restrictions should initially apply:
> * The join hint only support inner join
> * The ON clause should include equi-join condition
> * The time-condition {{o.proctime BETWEEN s.proctime AND s.proctime + INTERVAL '1' HOUR}}
only can use proctime that is a system attribute, the time condition only support bounded
time range like {{o.proctime BETWEEN s.proctime - INTERVAL '1' HOUR AND s.proctime + INTERVAL
'1' HOUR}}, not support unbounded like {{o.proctime > s.protime}},  and  should include
both two stream's proctime attribute, {{o.proctime between proctime() and proctime() + 1}}
should also not be supported.
> This issue includes:
> * Design of the DataStream operator to deal with stream join
> * Translation from Calcite's RelNode representation (LogicalJoin). 



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