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https://issues.apache.org/jira/browse/FLINK-12937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young closed FLINK-12937.
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Resolution: Implemented
Fix Version/s: 1.9.0
merged in 1.9.0: a6d72fed708e99404c96ffeca6ad70e08963e9cd
> Introduce join reorder planner rules in blink planner
> -----------------------------------------------------
>
> Key: FLINK-12937
> URL: https://issues.apache.org/jira/browse/FLINK-12937
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Planner
> Reporter: godfrey he
> Assignee: godfrey he
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This issue aims to let blink planner support join reorder.
> {{LoptOptimizeJoinRule}} in Calcite could meet our requirement for now, so we
> could use directly this rule in blink planner. {{JoinToMultiJoinRule}} ,
> {{ProjectMultiJoinMergeRule}} and {{FilterMultiJoinMergeRule}} should be also
> introduced to support {{LoptOptimizeJoinRule}}.
> additionally, we add a new rule named {{RewriteMultiJoinConditionRule}} which
> could apply transitive closure on `MultiJoin` for equi-join predicates to
> create more optimization possibilities.
> by default, join reorder is disabled, unless
> {{sql.optimizer.join-reorder.enabled}} is set as true.
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