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https://issues.apache.org/jira/browse/BEAM-1987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15972128#comment-15972128
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Aviem Zur commented on BEAM-1987:
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Sounds like a good feature.
AFAIK the semantics of joins in relational algebra discuss 2 operands[1].
We need to be clear on the semantics of the operations we are adding and have
good documentation for them.
[1] https://en.wikipedia.org/wiki/Relational_algebra#Outer_joins
> extend join-library to support 3+ PCollections
> ----------------------------------------------
>
> Key: BEAM-1987
> URL: https://issues.apache.org/jira/browse/BEAM-1987
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-extensions
> Reporter: Xu Mingmin
> Assignee: Xu Mingmin
>
> {{join.class}} in join-library can handle two source PCollections, to perform
> inner/left_outer/right_outer join.
> Extend the capability to handle more upstream PCollections.
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