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Posted to dev@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2017/05/08 10:11:04 UTC

[jira] [Created] (HIVE-16602) Implement shared scans with Tez

Jesus Camacho Rodriguez created HIVE-16602:
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             Summary: 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


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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