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From "Jihoon Son (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-256) Support data cube (Umbrella)
Date Wed, 16 Oct 2013 15:39:44 GMT

    [ https://issues.apache.org/jira/browse/TAJO-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13796904#comment-13796904
] 

Jihoon Son commented on TAJO-256:
---------------------------------

Right.
I'm sketching a rough mechanism of the transparent query execution for sampled data.
The sampling approach and the query optimization using statistics should be implemented lastly
after all the required works are finished.

Maintaining histograms in the catalog is a good idea.
I'll start to investigate the previous database systems.

Thanks.

> Support data cube (Umbrella)
> ----------------------------
>
>                 Key: TAJO-256
>                 URL: https://issues.apache.org/jira/browse/TAJO-256
>             Project: Tajo
>          Issue Type: New Feature
>          Components: catalog, distributed query plan, parser
>            Reporter: Jihoon Son
>            Assignee: Jihoon Son
>             Fix For: 0.3-incubating
>
>
> This issue includes follows sub issues
> * SQL support of group by extensions (GROUPING SETS, CUBE, ROLLUP)
> * Query execution of group by extensions
> * GROUPING() function
> * Data cube materialization process
> * Cube schema maintenance
> * Sample-based cost estimation



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