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Posted to issues@flink.apache.org by "Dmitriy Linevich (Jira)" <ji...@apache.org> on 2026/03/27 06:33:00 UTC

[jira] [Created] (FLINK-39340) Transform binary multi join back to regular join

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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