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https://issues.apache.org/jira/browse/KYLIN-2965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240403#comment-16240403
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Billy Liu commented on KYLIN-2965:
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Interesting found. +1
> RealizationChooser cost calculation logic different with CubeInstance
> ---------------------------------------------------------------------
>
> Key: KYLIN-2965
> URL: https://issues.apache.org/jira/browse/KYLIN-2965
> Project: Kylin
> Issue Type: Improvement
> Components: Query Engine
> Reporter: Ma Gang
> Assignee: Ma Gang
> Priority: Minor
> Attachments: kylin-2965.patch
>
>
> In RealizationChooser.RealizationCost, it uses cube's all
> dimensions(including all derived columns) to calculate the cost, but in
> CubeInstance, it use row key column count. Think it is a bug, should not
> include the derived column number to calculate cost
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