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https://issues.apache.org/jira/browse/KYLIN-2903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16306028#comment-16306028
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Wang, Gang commented on KYLIN-2903:
-----------------------------------
Sorry for the late response. Since the calculation depends on a MR job,
compared with HyperLogLog, it is quite slow. While, the calculation happens on
Hive table loading(or manually trigger), usually there is some time before cube
building, the duration may be acceptable. Also the the cardinality is pretty
valuable for cube builder who has little knowledge of data in the Hive tables.
I think this may be one way.
> 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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