Dmitriy Linevich created FLINK-39340:
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Summary: Transform binary multi join back to regular join
Key: FLINK-39340
URL: https://issues.apache.org/jira/browse/FLINK-39340
Project: Flink
Issue Type: Improvement
Reporter: Dmitriy Linevich
It has been observed that multi-join optimization leads to performance
regressions when the multi join has only two inputs.
!image-2026-03-27-13-23-35-237.png!
*As a result:*
* Q4 - 17% regression
* Q9 - 17% regression
* mini-batch optimization for regular join, but not for multi join
* window mofication for regular join, but not for multi join (Q5)
*Suggestions:*
# Add rule (BinaryMultiJoinToJoinRule) after multi join, that will transform
multi join with 2 inputs back to regular join
# Modify JoinToMultiJoinRule, it shouldn't to generate MultiJoin with 2 inputs
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