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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