[jira] Updated: (PIG-1322) Logical Optimizer: change outer join into regular join

["Daniel Dai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-1322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Dai updated PIG-1322:
----------------------------

         Assignee: Xuefu Zhang  (was: Daniel Dai)
    Fix Version/s: 0.9.0

> Logical Optimizer: change outer join into regular join
> ------------------------------------------------------
>
>                 Key: PIG-1322
>                 URL: https://issues.apache.org/jira/browse/PIG-1322
>             Project: Pig
>          Issue Type: Sub-task
>          Components: impl
>    Affects Versions: 0.7.0
>            Reporter: Daniel Dai
>            Assignee: Xuefu Zhang
>             Fix For: 0.9.0
>
>
> In some cases, we can change the outer join into a regular join. The benefit is regular join is easier to optimize in subsequent optimization. 
> Example:
> C = join A by a0 LEFT OUTER, B by b0;
> D = filter C by b0 > 0;
> => 
> C = join A by a0, B by b0;
> D = filter C by b0 > 0;
> Because we made this change, so PushUpFilter rule can further push the filter in front of regular join which otherwise cannot.

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