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https://issues.apache.org/jira/browse/HIVE-18819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt McCline updated HIVE-18819:
--------------------------------
    Attachment: HIVE-18819.03.patch

> Vectorization: Optimize IF statement expression evaluation of THEN/ELSE
> -----------------------------------------------------------------------
>
>                 Key: HIVE-18819
>                 URL: https://issues.apache.org/jira/browse/HIVE-18819
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>    Affects Versions: 3.0.0
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>         Attachments: HIVE-18819.01.patch, HIVE-18819.02.patch, 
> HIVE-18819.03.patch
>
>
> Currently, all the rows of a batch are evaluated for the THEN and ELSE 
> expressions even though only a value from one of them is needed for any 
> particular row.



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