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https://issues.apache.org/jira/browse/FLINK-37481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17952681#comment-17952681
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Gustavo de Morais commented on FLINK-37481:
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Update: [FLIP-516: Multi-Way Join
Operator|https://cwiki.apache.org/confluence/display/FLINK/FLIP-516%3A+Multi-Way+Join+Operator?src=jira]
has been approved, and the operator is currently being reviewed.
> FLIP-516: 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
> Assignee: 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 of binary joins.
>
> We want as a first step with this ticket to have a multi join operator that
> works on multiple inputs for streaming regular joins.
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