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https://issues.apache.org/jira/browse/FLINK-5159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15714311#comment-15714311
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Alexander Shoshin commented on FLINK-5159:
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[~fhueske], thank you a lot for your help with this issue!

> Improve perfomance of inner joins with a single row input
> ---------------------------------------------------------
>
>                 Key: FLINK-5159
>                 URL: https://issues.apache.org/jira/browse/FLINK-5159
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Alexander Shoshin
>            Assignee: Alexander Shoshin
>            Priority: Minor
>             Fix For: 1.2.0
>
>
> All inner joins (including a cross join) can be implemented as a 
> {{MapFunction}} if one of their inputs is a single row. This row can be 
> passed to a {{MapFunction}} as a {{BroadcastSet}}.
> This approach is going to be more lightweight than the other current 
> strategies.



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