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https://issues.apache.org/jira/browse/FLINK-4187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095991#comment-16095991
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Fabian Hueske commented on FLINK-4187:
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There are many different way in which streams can be joined. The Table API is
working on support for the most common types (incl. outer joins) but this is
on-going work.
You can implement many join strategies (incl. outer joins) with a
{{CoProcessFunction}}.
> Support for outer joins on DataStream
> -------------------------------------
>
> Key: FLINK-4187
> URL: https://issues.apache.org/jira/browse/FLINK-4187
> 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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