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Posted to dev@flink.apache.org by "Sihua Zhou (JIRA)" <ji...@apache.org> on 2018/03/12 05:00:00 UTC

[jira] [Created] (FLINK-8918) Introduce Runtime Filter Join

Sihua Zhou created FLINK-8918:
---------------------------------

             Summary: Introduce Runtime Filter Join
                 Key: FLINK-8918
                 URL: https://issues.apache.org/jira/browse/FLINK-8918
             Project: Flink
          Issue Type: Bug
          Components: Table API &amp; 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 [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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