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https://issues.apache.org/jira/browse/BEAM-1806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15942642#comment-15942642
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Aviem Zur commented on BEAM-1806:
---------------------------------
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 `asLeftOuterJoin` for CoGroupByKey
> -----------------------------------------------
>
> Key: BEAM-1806
> URL: https://issues.apache.org/jira/browse/BEAM-1806
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Xu Mingmin
> Assignee: Xu Mingmin
>
> Similar as BEAM-1805, restrict it as left-outer-join.
> The first {{PCollection}} is used as the key, if it's empty, output is
> ignored.
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