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https://issues.apache.org/jira/browse/KYLIN-4035?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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nichunen resolved KYLIN-4035.
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    Resolution: Fixed

> Calculate column cardinality by using spark engine
> --------------------------------------------------
>
>                 Key: KYLIN-4035
>                 URL: https://issues.apache.org/jira/browse/KYLIN-4035
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Spark Engine
>         Environment: kylin: master/3.0.0-alpha
> spark: 2.4.3
> hadoop: 2.6.5
>            Reporter: Jack
>            Assignee: Jack
>            Priority: Minor
>             Fix For: v3.0.0-alpha2
>
>
> Kylin will calculate column cardinality when loading hive table. This stage 
> is only supported by MR engine without spark. I think spark engine should be 
> used in this stage because of the following:
> 1) Kylin users can choose which engine they apply when calculating column 
> cardinality;
> 2) Some good spark features(e.g. dynamic resource allocation) can be used; 
> 3) The code written in spark is simple.
> I finish this work and test ok. But "kylin.engine.spark-cardinality=true" 
> should be added in kylin.properties(default is false). Look forwards to 
> suggestions.
> Best regards. 



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