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https://issues.apache.org/jira/browse/KYLIN-5019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoxiang Yu resolved KYLIN-5019.
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Resolution: Fixed
> Avoid building global dictionary from all data of fact table each time
> ----------------------------------------------------------------------
>
> Key: KYLIN-5019
> URL: https://issues.apache.org/jira/browse/KYLIN-5019
> Project: Kylin
> Issue Type: New Feature
> Affects Versions: v4.0.0-beta
> Reporter: Shengjun Zheng
> Assignee: Shengjun Zheng
> Priority: Major
> Fix For: v4.0.0
>
>
> Global dictionaries will be resized to avoid single dictionary bucket
> exceeding its threashold in each cubing job. To judge whether a dictionary
> should be resized, Kylin will read all data from fact table and do count
> distinct operation. Then rebuild dictionary from all history data.
> It’s better to use a lightweight approach, since dictionary don't need to be
> resized for incremental building in most cases.
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