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Posted to issues@kylin.apache.org by "Lemont (JIRA)" <ji...@apache.org> on 2018/06/12 07:45:00 UTC
[jira] [Updated] (KYLIN-3402) kylin not support count distinct in
sub
[ https://issues.apache.org/jira/browse/KYLIN-3402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lemont updated KYLIN-3402:
--------------------------
Issue Type: Improvement (was: Task)
> kylin not support count distinct in sub
> ---------------------------------------
>
> Key: KYLIN-3402
> URL: https://issues.apache.org/jira/browse/KYLIN-3402
> Project: Kylin
> Issue Type: Improvement
> Reporter: Lemont
> Priority: Major
>
> why kylin not support count distinct in innermost sub-query.To deal with it I have to try another way to write sql,it's very complicated.
> For example id is the Dimensions：
> select count( DISTINCT case when condition = 1 then id end) idCount
> from (
> select condition,id
> from table
> where xxx
> group by xxx
> )
> To support count distinct I hava to rewrite it to:
> select count(1) from (
> select case when condition = 1 then id end idCount
> from (
> select condition,id
> from table
> where xxx
> group by xxx
> ) group by idCount
> )
> I feel so bad with it ,Is there a better solution?
> Thanks to every answer
>
>
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