[jira] [Assigned] (FLINK-32831) RuntimeFilterProgram should aware join type when looking for the build side

["Lijie Wang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-32831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lijie Wang reassigned FLINK-32831:
----------------------------------

    Assignee: Lijie Wang

> RuntimeFilterProgram should aware join type when looking for the build side
> ---------------------------------------------------------------------------
>
>                 Key: FLINK-32831
>                 URL: https://issues.apache.org/jira/browse/FLINK-32831
>             Project: Flink
>          Issue Type: Bug
>          Components: Table SQL / Planner
>    Affects Versions: 1.18.0
>            Reporter: Lijie Wang
>            Assignee: Lijie Wang
>            Priority: Major
>
> Currently, runtime filter program will try to look for an {{Exchange}} as build side to avoid affecting {{MultiInput}}. It will try to push down the runtime filter builder if the original build side is not {{Exchange}}.
> Currenlty, the builder-push-down does not aware the join type, which may lead to incorrect results(For example, push down the builder to the right input of left-join).
> We should only support following cases:
> 1. Inner join: builder can push to left + right input
> 2. semi join: builder can push to left + right input
> 3. left join: builder can only push to the left input
> 4. right join: builder can only push to the right input



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