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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5775) Introduce Cost Based Optimizer to Hive
Date Mon, 23 Jun 2014 18:09:25 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14041056#comment-14041056
] 

Xuefu Zhang commented on HIVE-5775:
-----------------------------------

Thanks for the clarification, [~gopalv]. We are in total agreement if what is put in the logical
layer is the optimization that's applicable to either execution engine and if execution engine
specific optimization is put in the execution layer. Maybe the document can be updated to
make this explicit to avoid confusion/misunderstanding from others.

{quote}
The cost model as described in the doc assumes TEZ as the execution layer.
{quote}

Not sure if I understand [~jpullokkaran] correctly. If the cost model is based on Tez, then
we shall only use a model that's common for both Tez and MR when rewriting the query, right?

> Introduce Cost Based Optimizer to Hive
> --------------------------------------
>
>                 Key: HIVE-5775
>                 URL: https://issues.apache.org/jira/browse/HIVE-5775
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Laljo John Pullokkaran
>            Assignee: Laljo John Pullokkaran
>         Attachments: CBO-2.pdf, HIVE-5775.1.patch
>
>




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