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https://issues.apache.org/jira/browse/BEAM-1806?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xu Mingmin resolved BEAM-1806.
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Resolution: Later
Fix Version/s: Not applicable
move to BEAM-1987
> 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
> Fix For: Not applicable
>
>
> 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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