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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11752) Pre-materializing complex CTE queries
Date Fri, 29 Jan 2016 12:08:39 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123404#comment-15123404
] 

Jesus Camacho Rodriguez commented on HIVE-11752:
------------------------------------------------

I have created uploaded the patch to RB for review: https://reviews.apache.org/r/42960/

> Pre-materializing complex CTE queries
> -------------------------------------
>
>                 Key: HIVE-11752
>                 URL: https://issues.apache.org/jira/browse/HIVE-11752
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>         Attachments: HIVE-11752.03.patch, HIVE-11752.1.patch.txt, HIVE-11752.2.patch.txt
>
>
> Currently, hive regards CTE clauses as a simple alias to the query block, which makes
redundant works if it's used multiple times in a query. This introduces a reference threshold
for pre-materializing the CTE clause as a volatile table (which is not exists in any form
of metastore and just accessible from QB).



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