[jira] [Commented] (HIVE-3917) Support noscan operation for analyze command

["Gang Tim Liu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-3917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13568477#comment-13568477 ] 

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

discussed with Namit. we will keep current analyze behavior as it is. no error thrown. thanks
                
> 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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