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https://issues.apache.org/jira/browse/FLINK-5256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15754605#comment-15754605
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Fabian Hueske commented on FLINK-5256:
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Thanks for the notice!

> Extend DataSetSingleRowJoin to support Left and Right joins
> -----------------------------------------------------------
>
>                 Key: FLINK-5256
>                 URL: https://issues.apache.org/jira/browse/FLINK-5256
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>    Affects Versions: 1.2.0
>            Reporter: Fabian Hueske
>
> The {{DataSetSingleRowJoin}} is a broadcast-map join that supports arbitrary 
> inner joins where one input is a single row.
> I found that Calcite translates certain subqueries into non-equi left and 
> right joins with single input. These cases can be handled if the  
> {{DataSetSingleRowJoin}} is extended to support outer joins on the 
> non-single-row input, i.e., left joins if the right side is single input and 
> vice versa.



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