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Date: Wed, 9 Oct 2013 05:28:41 +0000 (UTC)
From: "Ashutosh Chauhan (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12672960.1381295184957.36530.1381296521795@arcas>
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Subject: [jira] [Comment Edited] (HIVE-5498) Merge metadata only optimizer
 into simple fetch optimizer
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    [ https://issues.apache.org/jira/browse/HIVE-5498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790027#comment-13790027 ] 

Ashutosh Chauhan edited comment on HIVE-5498 at 10/9/13 5:26 AM:
-----------------------------------------------------------------

With {{set hive.fetch.task.conversion = more;}} and {{set hive.fetch.task.aggr=true;}}This has many advantages:
* queries which metadata only optimizer currently targets can be run purely in client without launching MR job. Currently it 
launches MR job for it which is wasteful. So, it will be faster than its current form.
* Since we won't be launching MR job we won't have to deal with bugs like HIVE-3594 and HIVE-2955
* Than we can get rid of hacks like Utilites::getInputs() and Utilities::setInputs()
* This will result in lesser code to maintain
* This can lay foundation for HIVE-4150


was (Author: ashutoshc):
This has many advantages:
* queries which metadata only optimizer currently targets can be run purely in client without launching MR job. Currently it 
launches MR job for it which is wasteful. So, it will be faster than its current form.
* Since we won't be launching MR job we won't have to deal with bugs like HIVE-3594 and HIVE-2955
* Than we can get rid of hacks like Utilites::getInputs() and Utilities::setInputs()
* This will result in lesser code to maintain
* This can lay foundation for HIVE-4150

> Merge metadata only optimizer into simple fetch optimizer
> ---------------------------------------------------------
>
>                 Key: HIVE-5498
>                 URL: https://issues.apache.org/jira/browse/HIVE-5498
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Ashutosh Chauhan
>
> Metadata only optimizer is currently written as physical optimizer. It can be merged into simple fetch optimizer where it will than become a logical optimizer. 


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