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From "Billy Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KYLIN-2965) RealizationChooser cost calculation logic different with CubeInstance
Date Mon, 06 Nov 2017 15:01:00 GMT

    [ https://issues.apache.org/jira/browse/KYLIN-2965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240403#comment-16240403
] 

Billy Liu commented on KYLIN-2965:
----------------------------------

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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