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https://issues.apache.org/jira/browse/FLINK-37481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17936715#comment-17936715
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Gustavo de Morais commented on FLINK-37481:
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Hey [~lsy], I'm working on a document and a
[PoC|https://github.com/apache/flink/pull/26313]. Glad to share it here as soon
as it's ready for review
> Multi way join operator
> -----------------------
>
> Key: FLINK-37481
> URL: https://issues.apache.org/jira/browse/FLINK-37481
> Project: Flink
> Issue Type: New Feature
> Reporter: Gustavo de Morais
> Priority: Major
> Labels: pull-request-available
>
> We currently always rely on a chain of binary joins when there are multiple
> joins in a query. This can often generate a lot of intermediate state which
> considerably increases the state size - specially for regular joins. There
> are optimizations that can be done to a multi-way join operator that can
> optimize the worst case scenarios for binary joins.
>
> We want as a first step with this ticket to have a multi join operator that
> works on multiple inputs for regular joins.
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