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https://issues.apache.org/jira/browse/KYLIN-2820?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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nichunen resolved KYLIN-2820.
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Resolution: Fixed
> Query can't read window function's result from subquery
> -------------------------------------------------------
>
> Key: KYLIN-2820
> URL: https://issues.apache.org/jira/browse/KYLIN-2820
> Project: Kylin
> Issue Type: Bug
> Affects Versions: v2.1.0
> Reporter: Mu Kong
> Assignee: nichunen
> Priority: Major
> Labels: scope
> Fix For: v3.0.0-beta
>
>
> I executed a query like the follows:
> {code:sql}
> select first_page_name, count(*) as page_name_count from
> (
> select first_value(page_name) over(partition by session_id) as
> first_page_name from some_db.some_table
> ) group by first_page_name;
> {code}
> This query resulted in one single record with an empty string as the
> first_page_name, and a big number as the page_name_count.
> However, when I ran the subquery without the outer query, it resulted in
> multiple records with different first_page_name, which proved the query above
> was wrong.
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