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https://issues.apache.org/jira/browse/HIVE-21133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez reassigned HIVE-21133:
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> Add simulated materialized views useful for rewriting debugging
> ---------------------------------------------------------------
>
> Key: HIVE-21133
> URL: https://issues.apache.org/jira/browse/HIVE-21133
> Project: Hive
> Issue Type: Improvement
> Components: Materialized views
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
>
> Implement simulated materialized views, useful to check whether a certain
> rewriting will be triggered. Simulated materialized views definitions will be
> stored in the user session, and they will only be used when simulation mode
> is enabled and user runs {{explain cbo}} / {{explain cbo extended}}.
> {code}
> set hive.simulation.enable=true;
> create simulated materialized view mv1_n2 as
> select * from emps_n3 where empid < 150;
> explain cbo
> select *
> from (select * from emps_n3 where empid < 120) t
> join depts_n2 using (deptno);
> drop simulated materialized view mv1_n2;
> {code}
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