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From "Yan Zhou (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1399) Logical Optimizer: Expression optimizor rule
Date Thu, 15 Jul 2010 01:14:50 GMT

     [ https://issues.apache.org/jira/browse/PIG-1399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yan Zhou updated PIG-1399:
--------------------------

    Attachment:     (was: PIG-1399.patch)

> Logical Optimizer: Expression optimizor rule
> --------------------------------------------
>
>                 Key: PIG-1399
>                 URL: https://issues.apache.org/jira/browse/PIG-1399
>             Project: Pig
>          Issue Type: Sub-task
>          Components: impl
>    Affects Versions: 0.7.0
>            Reporter: Daniel Dai
>            Assignee: Yan Zhou
>             Fix For: 0.8.0
>
>
> We can optimize expression in several ways:
> 1. Constant pre-calculation
> Example:
> B = filter A by a0 > 5+7;
> => B = filter A by a0 > 12;
> 2. Boolean expression optimization
> Example:
> B = filter A by not (not(a0>5) or a>10);
> => B = filter A by a0>5 and a<=10;

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