Sihua Zhou commented on FLINK-8918:

Hi [~fhueske] could you please have a look at this after flink 1.5 is released ?

> Introduce Runtime Filter Join
> -----------------------------
>                 Key: FLINK-8918
>                 URL: https://issues.apache.org/jira/browse/FLINK-8918
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API & SQL
>            Reporter: Sihua Zhou
>            Assignee: Sihua Zhou
>            Priority: Major
>             Fix For: 1.6.0
> Right now, for every record that need to be joined, we need to query both 
> `left stream's state` and `right stream's state`. I proposal to introduce RF 
> join to reduce the `query count` of state, which could improve the 
> performance of `stream join`, especially when the joined rate is low. A 
> simple description for RF join can be found 
> [here|https://www.cloudera.com/documentation/enterprise/5-9-x/topics/impala_runtime_filtering.html]
>  (even though it not for stream join original, but we can easily refer it to 
> `stream join`).

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