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https://issues.apache.org/jira/browse/PIG-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ankit Modi updated PIG-1178:
----------------------------

    Status: Patch Available  (was: Open)

> LogicalPlan and Optimizer are too complex and hard to work with
> ---------------------------------------------------------------
>
>                 Key: PIG-1178
>                 URL: https://issues.apache.org/jira/browse/PIG-1178
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Alan Gates
>            Assignee: Ying He
>         Attachments: expressions-2.patch, expressions.patch, lp.patch, 
> lp.patch, pig_1178.patch, pig_1178.patch, PIG_1178.patch, pig_1178_2.patch, 
> pig_1178_3.patch
>
>
> The current implementation of the logical plan and the logical optimizer in 
> Pig has proven to not be easily extensible. Developer feedback has indicated 
> that adding new rules to the optimizer is quite burdensome. In addition, the 
> logical plan has been an area of numerous bugs, many of which have been 
> difficult to fix. Developers also feel that the logical plan is difficult to 
> understand and maintain. The root cause for these issues is that a number of 
> design decisions that were made as part of the 0.2 rewrite of the front end 
> have now proven to be sub-optimal. The heart of this proposal is to revisit a 
> number of those proposals and rebuild the logical plan with a simpler design 
> that will make it much easier to maintain the logical plan as well as extend 
> the logical optimizer. 
> See http://wiki.apache.org/pig/PigLogicalPlanOptimizerRewrite for full 
> details.

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