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https://issues.apache.org/jira/browse/BEAM-1806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943614#comment-15943614
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Xu Mingmin commented on BEAM-1806:
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[~aviemzur] thanks to point it, I only noticed CoGroupByKey and GroupByKey
before, will try join-library first.
> 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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