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From "Thejas M Nair (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6439) Introduce CBO step in Semantic Analyzer
Date Wed, 19 Feb 2014 01:39:21 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13904970#comment-13904970
] 

Thejas M Nair commented on HIVE-6439:
-------------------------------------

+1 LGTM


> Introduce CBO step in Semantic Analyzer
> ---------------------------------------
>
>                 Key: HIVE-6439
>                 URL: https://issues.apache.org/jira/browse/HIVE-6439
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Harish Butani
>            Assignee: Harish Butani
>         Attachments: HIVE-6439.1.patch, HIVE-6439.2.patch, HIVE-6439.4.patch, HIVE-6439.5.patch
>
>
> This patch introduces CBO step in SemanticAnalyzer. For now the CostBasedOptimizer is
an empty shell. 
> The contract between SemAly and CBO is:
> - CBO step  is controlled by the 'hive.enable.cbo.flag'. 
> - When true Hive SemAly will hand CBO a Hive Operator tree (with operators annotated
with stats). If it can CBO will return a better plan in Hive AST form.



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