ASF GitHub Bot commented on FLINK-5159:

Github user fhueske commented on the issue:

    Thanks for the update @AlexanderShoshin.
    PR is good to merge!

> 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
> 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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