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Posted to issues@kylin.apache.org by "Shaofeng SHI (JIRA)" <ji...@apache.org> on 2017/12/22 00:28:00 UTC

[jira] [Commented] (KYLIN-2903) support cardinality calculation for Hive view

    [ https://issues.apache.org/jira/browse/KYLIN-2903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16300759#comment-16300759 ] 

Shaofeng SHI commented on KYLIN-2903:
-------------------------------------

Hi Gang, how about hive's count distinct performance compared with Kylin's HyperLogLog? This is the only concern I have, because when the table/view is huge, this task may become difficult.  

> support cardinality calculation for Hive view
> ---------------------------------------------
>
>                 Key: KYLIN-2903
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2903
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Job Engine
>            Reporter: Wang, Gang
>            Assignee: Wang, Gang
>            Priority: Minor
>         Attachments: 0001-KYLIN-2903-support-cardinality-calculation-for-Hive-.patch
>
>
> Currently, Kylin leverage HCatlog to calculate column cardinality for Hive tables. While, HCatlog does not support Hive view actually. 



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