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Posted to dev@kylin.apache.org by "Lemont (JIRA)" <ji...@apache.org> on 2018/06/08 16:30:00 UTC

[jira] [Created] (KYLIN-3402) kylin not support count distinct in sub

Lemont created KYLIN-3402:
-----------------------------

             Summary: kylin not support count distinct in sub
                 Key: KYLIN-3402
                 URL: https://issues.apache.org/jira/browse/KYLIN-3402
             Project: Kylin
          Issue Type: Task
            Reporter: Lemont


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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