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https://issues.apache.org/jira/browse/FLINK-28599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17598349#comment-17598349
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Martijn Visser commented on FLINK-28599:
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[~godfreyhe] Does it make sense to already create a Calcite ticket and link it
to this one?
> Adding FlinkJoinToMultiJoinRule to support translating left/right outer join
> to multi join
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-28599
> URL: https://issues.apache.org/jira/browse/FLINK-28599
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Affects Versions: 1.16.0
> Reporter: Yunhong Zheng
> Assignee: Yunhong Zheng
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.16.0
>
>
> Now, Flink use Calcite's rule
> {code:java}
> JOIN_TO_MULTI_JOIN{code}
> to convert multiple joins into a join set, which can be used by join
> reorder. However, calcite's rule can not adapte to all outer joins. For left
> or right outer join, if they meet certain conditions, it can also be
> converted to multi join.
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