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https://issues.apache.org/jira/browse/HIVE-12369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt McCline updated HIVE-12369:
--------------------------------
    Status: Patch Available  (was: In Progress)

> Native Vector GroupBy (Part 1)
> ------------------------------
>
>                 Key: HIVE-12369
>                 URL: https://issues.apache.org/jira/browse/HIVE-12369
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>         Attachments: HIVE-12369.01.patch, HIVE-12369.02.patch, 
> HIVE-12369.05.patch, HIVE-12369.06.patch, HIVE-12369.091.patch, 
> HIVE-12369.094.patch, HIVE-12369.095.patch, HIVE-12369.096.patch
>
>
> Implement Native Vector GroupBy using fast hash table technology developed 
> for Native Vector MapJoin, etc.
> Patch is currently limited to a single Long key with a single COUNT 
> aggregation.  Or, a single Long key and no aggregation also known as 
> duplicate reduction.
> 3 new classes introduces that stored the count in the slot table and don't 
> allocate hash elements:
> {noformat}
>   COUNT(column)  VectorGroupByHashLongKeyCountColumnOperator      
>   COUNT(key)     VectorGroupByHashLongKeyCountKeyOperator            
>   COUNT(*)       VectorGroupByHashLongKeyCountStarOperator           
> {noformat}
> And the duplicate reduction operator a single Long key:
> {noformat}
>   VectorGroupByHashLongKeyDuplicateReductionOperator
> {noformat}



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