[jira] [Created] (KYLIN-1482) [UMBRELLA] optimize the cuboids to be computed

["hongbin ma (JIRA)" <ji...@apache.org>]

hongbin ma created KYLIN-1482:
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             Summary: [UMBRELLA] optimize the cuboids to be computed
                 Key: KYLIN-1482
                 URL: https://issues.apache.org/jira/browse/KYLIN-1482
             Project: Kylin
          Issue Type: Task
    Affects Versions: v2.1
            Reporter: hongbin ma
            Assignee: hongbin ma


As known to many the number of cuboids is exponential to the number of dimensions. Currently in the latest dev branch, Kylin adopt a well designed pruning scheme called "New Aggregation Group" (http://kylin.apache.org/blog/2016/02/18/new-aggregation-group/) that allows user to specify relationships between dimensions for cuboid pruning. The rule-based approach is simple and effective in many situations.

However the rule-based approach also has its limitations: It will fail to capture potential prunings when the cube designer does not fully understand how the cube will be used, or the nature of the relationship between parent/child cuboid. In this case, we need to provide more flexible tools for cube designer to optimize which cuboids to be computed and which not to.



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