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https://issues.apache.org/jira/browse/FLINK-2576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14905449#comment-14905449
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ASF GitHub Bot commented on FLINK-2576:
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Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1138#issuecomment-142754122
Agreed with Fabian. For now, let's require join functions.
Future work would be to use Tuples with Options in Scala. In Java, we
should probably add an option type as well (and teach the TypeExtractor to use
them). Java core adds an Option type only in Java 8, unfortunately.
We could add one for Java 7 and deprecate it later.
> Add outer joins to API and Optimizer
> ------------------------------------
>
> Key: FLINK-2576
> URL: https://issues.apache.org/jira/browse/FLINK-2576
> Project: Flink
> Issue Type: Sub-task
> Components: Java API, Optimizer, Scala API
> Reporter: Ricky Pogalz
> Priority: Minor
> Fix For: pre-apache
>
>
> Add left/right/full outer join methods to the DataSet APIs (Java, Scala) and
> to the optimizer of Flink.
> Initially, the execution strategy should be a sort-merge outer join
> (FLINK-2105) but can later be extended to hash joins for left/right outer
> joins.
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