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Posted to issues@kylin.apache.org by "Shaofeng SHI (JIRA)" <ji...@apache.org> on 2018/09/12 12:36:00 UTC

[jira] [Updated] (KYLIN-2861) For dictionary building of lookup table columns, reduce the table scan chance

     [ https://issues.apache.org/jira/browse/KYLIN-2861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shaofeng SHI updated KYLIN-2861:
--------------------------------
    Fix Version/s:     (was: v2.5.0)
                   v2.6.0

> For dictionary building of lookup table columns, reduce the table scan chance
> -----------------------------------------------------------------------------
>
>                 Key: KYLIN-2861
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2861
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Job Engine
>            Reporter: Zhong Yanghong
>            Assignee: Zhong Yanghong
>            Priority: Major
>             Fix For: v2.6.0
>
>
> In some cases, several columns from the same lookup table are defined as normal dimensions. We'll build dictionaries for these columns. With current implementation, for each column, the whole lookup table needs to be scanned once. Then if there are N columns, kylin needs to scan the lookup table N times.
> For this JIRA, we'll scan only once to build all of the related columns.



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