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https://issues.apache.org/jira/browse/HIVE-16602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16009573#comment-16009573
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Lefty Leverenz commented on HIVE-16602:
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Doc note: This adds *hive.optimize.shared.scan* to HiveConf.java, so it needs
to be documented in the wiki. (Although it isn't a "hive.tez.*" config,
perhaps it should be listed with other Tez-related configs at the beginning of
the Tez section.)
* [Configuration Properties -- Query and DDL Execution |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]
* [Configuration Properties -- Tez |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-Tez]
Added a TODOC3.0 label.
> 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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