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Posted to dev@hive.apache.org by "Sun Rui (JIRA)" <ji...@apache.org> on 2013/03/27 07:45:16 UTC

[jira] [Commented] (HIVE-784) Support uncorrelated subqueries in the WHERE clause

    [ 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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