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https://issues.apache.org/jira/browse/KYLIN-3924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16809597#comment-16809597
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Chao Long commented on KYLIN-3924:
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Hi, Kylin only build dictionary for dict-encoding columns and some columns in
special measure(precisely count distinct, topN) which need global dictionary.
> Build cube on step 'build Dimension Dictionary ', the contents of
> non-dimensional columns are also checked and built
> --------------------------------------------------------------------------------------------------------------------
>
> Key: KYLIN-3924
> URL: https://issues.apache.org/jira/browse/KYLIN-3924
> Project: Kylin
> Issue Type: Bug
> Components: Job Engine, Tools, Build and Test
> Affects Versions: v2.6.1
> Reporter: wangxiaojing
> Priority: Major
> Labels: build, patch
> Attachments: builderr.log
>
>
> Hi all,
> I use version 2.6.1 , when build cube on step 'build Dimension Dictionary'
> for lookup tables ,it throws some exceptions,it seems checks the content size
> of each field in the table while building Dimension Dictionary, and build all
> fields in the table with a dictionary.
> Suggestion:
> 1. Large content fields may not be dimension columns, in fact, it is not
> necessary to check the value size of non-dimension columns，only check
> dimension columns.
> 2. If the value of some fields in the dimension table is too long, the
> exception is not clear, can not be located the problem column quickly.
> 3. There is no need to build dictionaries for non-dimensional columns
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