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Date: Fri, 1 Feb 2013 04:41:13 +0000 (UTC)
From: "Namit Jain (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Updated] (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:all-tabpanel ]

Namit Jain updated HIVE-3917:
-----------------------------

    Status: Open  (was: Patch Available)

comments

Let us thrown an error for external tables.
                
> 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-3917.patch.2, HIVE-3917.patch.3, HIVE-3917.patch.4
>
>
> 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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