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https://issues.apache.org/jira/browse/TAJO-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386464#comment-14386464
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Jihoon Son commented on TAJO-256:
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Right. Maybe, there will be more optimization opportunities, but your
suggestion looks a good starting point.
As you said, the set of GS can be processed in a single scan, but Tajo
currently does not support it.
So, it is important how separate group-bys for each GS set can share the common
scan (that is, scan for the largest set).
I think that this will be a major problem in this issue.
> 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
>
> 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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