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

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

Lijie Wang created FLINK-32831:
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             Summary: 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


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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