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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