Lemont created KYLIN-3402:
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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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