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https://issues.apache.org/jira/browse/BEAM-1805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15942640#comment-15942640
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Aviem Zur commented on BEAM-1805:
---------------------------------
Have you taken a look at
[join-library|https://github.com/apache/beam/blob/master/sdks/java/extensions/join-library/src/main/java/org/apache/beam/sdk/extensions/joinlibrary/Join.java]?
> a new option `asInnerJoin` for CoGroupByKey
> -------------------------------------------
>
> Key: BEAM-1805
> URL: https://issues.apache.org/jira/browse/BEAM-1805
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Xu Mingmin
> Assignee: Xu Mingmin
>
> {{CoGroupByKey}} joins multiple PCollection<KV<K, V>>, act as full-outer join.
> Option {{asInnerJoin()}} restrict the output to convert to an inner-join
> behavior.
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