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From "Sun Rui (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-784) Support uncorrelated subqueries in the WHERE clause
Date Wed, 27 Mar 2013 06:45:16 GMT

    [ https://issues.apache.org/jira/browse/HIVE-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614982#comment-13614982
] 

Sun Rui commented on HIVE-784:
------------------------------

Guido, you may try project-panthera-ase@github, which is an open source effort for HIVE-3472.
It can support correlated/un-correlated subqueries and selection from multiple tables without
any join operator now. Instead of directly modifying the HiveQL grammar and query processor
to support subqueries, the project incorporates a PL/SQL parser for SQL input and performs
semantically identical transformation on the PL/SQL parser output for execution by the query
processor.
                
> 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: Ning Zhang
>
> 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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