hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-21133) Support views with rewriting enabled useful for debugging
Date Mon, 01 Jul 2019 16:27:00 GMT

     [ 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)

Mime
View raw message