Xu Mingmin created BEAM-1806:
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             Summary: 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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