[
https://issues.apache.org/jira/browse/KYLIN-3870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16791257#comment-16791257
]
Shaofeng SHI commented on KYLIN-3870:
-------------------------------------
[~Zhixiong Chen] I think this is a different and better approach.
Yanghong's enhancement is converting "count(col)" to "sum(case when col is null
then 0 else count(1))", it need the "col" is on the dimension list, and it will
take more time when the column cardinality is high.
This proposal is to pre-calculate "sum(col)" during the cube building, and
without requiring the column on dimension list.
> Kylin support count(column)
> ---------------------------
>
> Key: KYLIN-3870
> URL: https://issues.apache.org/jira/browse/KYLIN-3870
> Project: Kylin
> Issue Type: Improvement
> Reporter: jinguowei
> Assignee: xiaodongzhang
> Priority: Major
>
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
