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https://issues.apache.org/jira/browse/HIVE-16602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez updated HIVE-16602:
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Attachment: HIVE-16602.patch
> 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
> Attachments: 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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