Greg Hogan resolved FLINK-4188.
    Resolution: Duplicate

> Support for outer joins on DataStream
> -------------------------------------
>                 Key: FLINK-4188
>                 URL: https://issues.apache.org/jira/browse/FLINK-4188
>             Project: Flink
>          Issue Type: New Feature
>          Components: DataStream API
>            Reporter: Ignacio N. Lucero Ascencio
>            Priority: Minor
>              Labels: features
>   Original Estimate: 672h
>  Remaining Estimate: 672h
> It would be nice to have support for outer joins on DataStream. DataSet 
> supports all the outer joins (left, right, full) but DataStream only provides 
> the inner join. 
> It has been pointed out that an outer join can be achieved with a coGroup, 
> but I am of the opinion that having first-class support for outer joins would 
> be nicer.

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