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https://issues.apache.org/jira/browse/TAJO-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14368656#comment-14368656
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Jihoon Son commented on TAJO-256:
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Thanks [~dongjoon]. When I'm ready, I'll start this issue again.
On the naive implementation, it may be possible.
Honestly, we supported a naive cube operator at first, but have removed due to
performance issues.
Thanks [[email protected]] for sharing. Cost-based query optimization is
very important.
Actually, our query planner have been using the cost-based optimization after
when Tajo entered Apache incubation.
> 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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