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https://issues.apache.org/jira/browse/HIVE-24929?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Krisztian Kasa reassigned HIVE-24929:
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> Allow correlated exists subqueries with windowing clause
> --------------------------------------------------------
>
> Key: HIVE-24929
> URL: https://issues.apache.org/jira/browse/HIVE-24929
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Major
> Fix For: 4.0.0
>
>
> Currently queries which has windowing clause with subqueries are not
> supported by Hive: Hive rewrites subqueries to joins and the rewritten plan
> would lead to incorrect results such cases.
> However this restriction can be lifted in case of Exists/Not exists
> subqueries since those cases we don not interested in the result of the
> window function call but the existence of any record.
> {code}
> select id, int_col
> from alltypesagg a
> where exists
> (select sum(int_col) over (partition by bool_col)
> from alltypestiny b
> where a.id = b.id);
> {code}
> {code}
> select id, int_col from alltypestiny t
> where not exists
> (select sum(int_col) over (partition by bool_col)
> from alltypesagg a where t.id = a.int_col);
> {code}
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