[jira] [Commented] (KYLIN-2765) Eliminate restriction on Global Dictionary of Dim columns

["kangkaisen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KYLIN-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108767#comment-16108767 ] 

kangkaisen commented on KYLIN-2765:
-----------------------------------

What's the goal of this JIRA?  Use Global Dict for Dimension column or one column support two type dicts when one column need to be Dimension and Measure at the same time?

> Eliminate restriction on Global Dictionary of Dim columns
> ---------------------------------------------------------
>
>                 Key: KYLIN-2765
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2765
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Job Engine, Metadata, Query Engine
>            Reporter: Roger Shi
>            Assignee: Dong Li
>
> Cube dimension column is not allow to be in accurate-count-distinct measure. Global Dictionary encoding is a kind of dict in metadata. Dict encoding is created for dim at the beginning, so Global Dictionary is a special one for measure.
> To eliminate the restriction, there're two possible ways in my view. One is move Global Dictionary metadata out of dict section to a new section such as "measure dict" (not there now, create a new one). The other way is handle Global Dictionary differently in both cubing engine and query engine.
> There might be other better methods. Let's discuss here and find a good way out. 



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