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https://issues.apache.org/jira/browse/FLINK-38401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18021911#comment-18021911
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Sergey Nuyanzin commented on FLINK-38401:
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Merged as
[ecd284da3365adc36647b2dd1a6ef4fad3c84671|https://github.com/apache/flink/commit/ecd284da3365adc36647b2dd1a6ef4fad3c84671]
> Add MultiJoin MetadataHandler for FlinkRelMdUpsertKeys
> ------------------------------------------------------
>
> Key: FLINK-38401
> URL: https://issues.apache.org/jira/browse/FLINK-38401
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Affects Versions: 2.1.0
> Reporter: Gustavo de Morais
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.2.0
>
>
> We’re currently using the default implementation of getUpsertKeys which leads
> to the upsertKeys not being preserved past a MultiJoin. This ticket adds
> support for it so the planner properly calculates the possible upsertKeys out
> of a N way join.
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