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Date: Fri, 4 Oct 2013 23:30:44 +0000 (UTC)
From: "Harish Butani (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12433867.1251134977793.17933.1380929444438@arcas>
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References: <JIRA.12433867.1251134977793@arcas>
Subject: [jira] [Commented] (HIVE-784) Support uncorrelated subqueries in
 the WHERE clause
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    [ https://issues.apache.org/jira/browse/HIVE-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13786749#comment-13786749 ] 

Harish Butani commented on HIVE-784:
------------------------------------

Just uploaded a script with tpch queries Q4, Q15, Q16 and Q18 written using SubQueries.
Validated results against what is in the Spec.
Script includes ddl at the bottom.

> Support uncorrelated subqueries in the WHERE clause
> ---------------------------------------------------
>
>                 Key: HIVE-784
>                 URL: https://issues.apache.org/jira/browse/HIVE-784
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Ning Zhang
>            Assignee: Matthew Weaver
>         Attachments: HIVE-784.1.patch.txt, HIVE-784.2.patch, SubQuerySpec.pdf, tpchQueriesUsingSubQueryClauses.sql
>
>
> Hive currently only support views in the FROM-clause, some Facebook use cases suggest that Hive should support subqueries such as those connected by IN/EXISTS in the WHERE-clause. 


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