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] [Assigned] (HIVE-16867) Extend shared scan optimizer to reuse computation from other operators
Date Fri, 09 Jun 2017 11:35:18 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesus Camacho Rodriguez reassigned HIVE-16867:
----------------------------------------------


> Extend shared scan optimizer to reuse computation from other operators
> ----------------------------------------------------------------------
>
>                 Key: HIVE-16867
>                 URL: https://issues.apache.org/jira/browse/HIVE-16867
>             Project: Hive
>          Issue Type: Improvement
>          Components: Physical Optimizer
>    Affects Versions: 3.0.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>
> Follow-up of the work in HIVE-16602.
> HIVE-16602 introduced an optimization that identifies scans on input tables that can
be merged so the data is read only once.
> This extension to that rule allows to reuse the computation that is done in the work
containing those scans. In particular, we traverse both parts of the plan upstream and reuse
the operators if possible.
> Currently, the optimizer will not go beyond the output edge(s) of that work. Follow-up
extensions might remove this limitation.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)

Mime
View raw message