Sihua Zhou created FLINK-8918:

             Summary: Introduce Runtime Filter Join
                 Key: FLINK-8918
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
            Reporter: Sihua Zhou
            Assignee: Sihua Zhou
             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 
 (even though it not for stream join original, but we can easily refer it to 
`stream join`).

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