Zhong Yanghong closed KYLIN-2728.
    Resolution: Done

> Introduce a new cuboid scheduler based on cuboid tree rather than static rules
> ------------------------------------------------------------------------------
>                 Key: KYLIN-2728
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2728
>             Project: Kylin
>          Issue Type: Sub-task
>    Affects Versions: v2.1.0
>            Reporter: Zhong Yanghong
>            Assignee: Ma Gang
>            Priority: Major
>             Fix For: v2.2.0
> Rather than depending on static rules to define a parent-child relationship 
> between cuboids, a cuboid tree can be constructed for this relationship. In 
> this tree, the root is the base cuboid. For a cuboid, it may have many legal 
> parent cuboids. We should choose the {color:#f79232}best parent {color}cuboid 
> as its parent in this tree. Then how to define the best? It's related two 
> rules as follows:
> * If we know the row count, choose the one with the least row count
> * Otherwise, choose the smallest cuboid
> Based on the cuboid tree, we introduced a new cuboid scheduler called 
> {{TreeCuboidScheduler}}. And both cube building & query can be based on 
> {{TreeCuboidScheduler}}.

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