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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-16550) Semijoin Hints should be able to skip the optimization if needed.
Date Thu, 04 May 2017 09:38:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-16550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996441#comment-15996441
] 

Lefty Leverenz commented on HIVE-16550:
---------------------------------------

Doc note:  This needs to be documented in the wiki, with version information.

Possible doc locations:

* [Language Manual -- Joins | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Joins]
* [Language Manual -- Join Optimization | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+JoinOptimization]
-- (semijoins not mentioned yet)
* [Design Docs -- Correlation Optimizer | https://cwiki.apache.org/confluence/display/Hive/Correlation+Optimizer]
-- (semijoins mentioned in "2.3 Example 3" and "4. Correlation Detection")

Added a TODOC3.0 label.

> Semijoin Hints should be able to skip the optimization if needed.
> -----------------------------------------------------------------
>
>                 Key: HIVE-16550
>                 URL: https://issues.apache.org/jira/browse/HIVE-16550
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>              Labels: TODOC3.0
>             Fix For: 3.0.0
>
>         Attachments: HIVE-16550.1.patch, HIVE-16550.2.patch, HIVE-16550.3.patch
>
>
> Currently semi join hints are designed to enforce a particular semi join, however, it
should also be able to skip the optimization all together in a query using hints.



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