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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4209) Cache evaluation result of deterministic expression and reuse it
Date Fri, 04 Jul 2014 06:30:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052196#comment-14052196
] 

Lefty Leverenz commented on HIVE-4209:
--------------------------------------

*hive.cache.expr.evaluation* is documented in the wiki here:

* [Configuration Properties -- hive.cache.expr.evaluation | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.cache.expr.evaluation]

I also added a comment to HIVE-6586 explaining that the current patch for HIVE-6037 (HIVE-6037-0.13.0)
truncates the description of *hive.cache.expr.evaluation*.

> Cache evaluation result of deterministic expression and reuse it
> ----------------------------------------------------------------
>
>                 Key: HIVE-4209
>                 URL: https://issues.apache.org/jira/browse/HIVE-4209
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>             Fix For: 0.12.0
>
>         Attachments: HIVE-4209.6.patch.txt, HIVE-4209.D9585.1.patch, HIVE-4209.D9585.2.patch,
HIVE-4209.D9585.3.patch, HIVE-4209.D9585.4.patch, HIVE-4209.D9585.5.patch
>
>
> For example, 
> {noformat}
> select key from src where key + 1 > 100 AND key + 1 < 200 limit 3;
> {noformat}
> key + 1 need not to be evaluated twice.



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