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From "Harish Butani (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-6439) Introduce CBO step in Semantic Analyzer
Date Tue, 18 Feb 2014 04:07:22 GMT

     [ https://issues.apache.org/jira/browse/HIVE-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harish Butani updated HIVE-6439:
--------------------------------

    Attachment: HIVE-6439.5.patch

> 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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