[
https://issues.apache.org/jira/browse/HIVE-21133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jesus Camacho Rodriguez updated HIVE-21133:
-------------------------------------------
Summary: Support views with rewriting enabled useful for debugging (was:
Add simulated materialized views useful for rewriting debugging)
> Support views with rewriting enabled useful for 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
> Attachments: HIVE-21133.01.patch, HIVE-21133.02.patch,
> HIVE-21133.02.patch, HIVE-21133.patch
>
>
> 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}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
