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https://issues.apache.org/jira/browse/TAJO-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14368511#comment-14368511
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Jihoon Son commented on TAJO-256:
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[~dongjoon], you already converted TAJO-259 as a sub-issue of this. Thanks.
As you know, CUBE and ROLLUP requires a lot of group-by operations with
different grouping keys.
Thus, for efficient execution, we need a mechanism to share aggregated
intermediate results.
When I created this issue, I was trying to solve this problem by extending
Tajo's execution plan to a form of DAG which allows cycles (TAJO-266).
However, I'm not focusing on these issues seriously due to some other urgent
issues now.
In addition, I'm not sure this approache is the best solution.
> 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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