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https://issues.apache.org/jira/browse/HIVE-15986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15966275#comment-15966275
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Pengcheng Xiong commented on HIVE-15986:
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LGTM +1, pending more test cases.

> Support "is [not] distinct from"
> --------------------------------
>
>                 Key: HIVE-15986
>                 URL: https://issues.apache.org/jira/browse/HIVE-15986
>             Project: Hive
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Carter Shanklin
>            Assignee: Vineet Garg
>         Attachments: HIVE-15986.1.patch, HIVE-15986.2.patch, 
> HIVE-15986.3.patch, HIVE-15986.4.patch, HIVE-15986.5.patch
>
>
> Support standard "is [not] distinct from" syntax. For example this gives a 
> standard way to do a comparison to null safe join: select * from t1 join t2 
> on t1.x is not distinct from t2.y. SQL standard reference Section 8.15



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