[jira] [Updated] (HIVE-21133) Add simulated materialized views useful for rewriting debugging

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-21133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jesus Camacho Rodriguez updated HIVE-21133:
-------------------------------------------
    Status: Patch Available  (was: In Progress)

> 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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