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Date: Tue, 29 Jan 2013 19:27:13 +0000 (UTC)
From: "Gang Tim Liu (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12628388.1358561516861.210331.1359487633830@arcas>
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Subject: [jira] [Commented] (HIVE-3917) Support noscan operation for analyze
 command
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    [ https://issues.apache.org/jira/browse/HIVE-3917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13565686#comment-13565686 ] 

Gang Tim Liu commented on HIVE-3917:
------------------------------------

Here is the following jira https://issues.apache.org/jira/browse/HIVE-3958
                
> Support noscan operation for analyze command
> --------------------------------------------
>
>                 Key: HIVE-3917
>                 URL: https://issues.apache.org/jira/browse/HIVE-3917
>             Project: Hive
>          Issue Type: Improvement
>          Components: Statistics
>    Affects Versions: 0.11.0
>            Reporter: Gang Tim Liu
>            Assignee: Gang Tim Liu
>         Attachments: HIVE-3917.patch.1
>
>
> hive supports analyze command to gather statistics from existing tables/partition https://cwiki.apache.org/confluence/display/Hive/StatsDev#StatsDev-ExistingTables
> It collects:
> 1. Number of Rows
> 2. Number of files
> 3. Size in Bytes
> If table/partition is big, the operation would take time since it will open all files and scan all data.
> It would be nice to support fast operation to gather statistics which doesn't require to open all files:
> 1. Number of files
> 2. Size in Bytes
> Potential syntax is 
> ANALYZE TABLE tablename [PARTITION(partcol1[=val1], partcol2[=val2], ...)] COMPUTE STATISTICS [noscan];
> In the future, all statistics without scan can be retrieved via this optional parameter.

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