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https://issues.apache.org/jira/browse/BEAM-1987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546472#comment-17546472
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Kenneth Knowles commented on BEAM-1987:
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This issue has been migrated to https://github.com/apache/beam/issues/18340
> 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: extensions-java-join-library
> Reporter: Mingmin Xu
> Priority: P3
> Labels: Clarified
>
> {{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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