Zhong Yanghong closed KYLIN-2802.
    Resolution: Done

> Enable cube planner phase one
> -----------------------------
>                 Key: KYLIN-2802
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2802
>             Project: Kylin
>          Issue Type: Sub-task
>    Affects Versions: v2.1.0
>            Reporter: Zhong Yanghong
>            Assignee: Wang Ken
>            Priority: Major
>             Fix For: v2.2.0
> This phase happens during cube building. To be able to trigger cube planner, 
> one of the following preconditions should be satisfied.
> * The cube is empty
> * Job is for refreshing the only one segment.
> Since cube planner is based on cuboid row count, if the first segment is 
> empty and there's no useful row count info, cube planner should not be 
> triggered in this phase.
> We also introduce a threshold. If the total number of defined cuboids is less 
> than this threshold, cube planner should not be triggered.

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