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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-16602) Implement shared scans with Tez
Date Sun, 14 May 2017 01:52:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lefty Leverenz updated HIVE-16602:
----------------------------------
    Labels: TODOC3.0  (was: )

> Implement shared scans with Tez
> -------------------------------
>
>                 Key: HIVE-16602
>                 URL: https://issues.apache.org/jira/browse/HIVE-16602
>             Project: Hive
>          Issue Type: New Feature
>          Components: Physical Optimizer
>    Affects Versions: 3.0.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>              Labels: TODOC3.0
>             Fix For: 3.0.0
>
>         Attachments: HIVE-16602.01.patch, HIVE-16602.02.patch, HIVE-16602.03.patch, HIVE-16602.04.patch,
HIVE-16602.patch
>
>
> Given a query plan, the goal is to identify scans on input tables that can be merged
so the data is read only once. Optimization will be carried out at the physical level.
> In the longer term, identification of equivalent expressions and reutilization of intermediary
results should be done at the logical layer via Spool operator.



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