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https://issues.apache.org/jira/browse/HIVE-18713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated HIVE-18713:
---------------------------
    Attachment: HIVE-18713.1.patch

> Optimize: Transform IN clauses to = when there's only one element
> -----------------------------------------------------------------
>
>                 Key: HIVE-18713
>                 URL: https://issues.apache.org/jira/browse/HIVE-18713
>             Project: Hive
>          Issue Type: Bug
>          Components: Vectorization
>    Affects Versions: 3.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Major
>         Attachments: HIVE-18713.1.patch
>
>
> (col1) IN (col2) can be transformed to (col1) = (col2), to avoid the hash-set 
> implementation.



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