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Posted to dev@pig.apache.org by "Daniel Dai (JIRA)" <ji...@apache.org> on 2010/06/22 02:14:58 UTC
[jira] Assigned: (PIG-1399) Logical Optimizer: Expression optimizor
rule
[ https://issues.apache.org/jira/browse/PIG-1399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daniel Dai reassigned PIG-1399:
-------------------------------
Assignee: Yan Zhou
> 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
>
> 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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