Zoltan Haindrich updated HIVE-18523:
    Status: Patch Available  (was: Open)


* ensure that mappers are launched if the groupby is working with an empty 
grouping set

> Fix summary row in case there are no inputs
> -------------------------------------------
>                 Key: HIVE-18523
>                 URL: https://issues.apache.org/jira/browse/HIVE-18523
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>         Attachments: HIVE-18523.01.patch
> HIVE-17617 added a fix to handle empty groups correctly; however it might be 
> possible that the summary row is returned multiple times - in case the 
> mappers are "seem" to be optimized away...

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