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https://issues.apache.org/jira/browse/KYLIN-1855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15642967#comment-15642967
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liyang commented on KYLIN-1855:
-------------------------------
What Hongbin describes is an ill model in a strict sense. In a healthy data
warehouse, such model should not exits.
I suggest querying of such model should return normally. However its result
won't match Hive. Later we should add some prerequisite check on models to
detect such illness earlier and notify user in advance.
> Should exclude those joins in whose related lookup tables no dimensions are
> used in cube
> ----------------------------------------------------------------------------------------
>
> Key: KYLIN-1855
> URL: https://issues.apache.org/jira/browse/KYLIN-1855
> Project: Kylin
> Issue Type: Improvement
> Reporter: Zhong Yanghong
> Assignee: Zhong Yanghong
> Fix For: v1.5.4
>
> Attachments: exclude_unused_joins.patch
>
>
> A cube is based on a model in which a star schema is defined. In some cases,
> the cube utilizes only a few lookup tables rather than all. In this case,
> when creating the sql for the flat table, those lookup tables should not be
> included. Otherwise, it will confuse users when query. If users do query
> according to the definition of the flat table, error of no realization will
> occur due to lack of the related join.
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