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https://issues.apache.org/jira/browse/PIG-262?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Gates resolved PIG-262.
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    Resolution: Fixed

Done as part of the types work, which is now in trunk.

> Pig needs an optimizer
> ----------------------
>
>                 Key: PIG-262
>                 URL: https://issues.apache.org/jira/browse/PIG-262
>             Project: Pig
>          Issue Type: Sub-task
>          Components: impl
>            Reporter: Alan Gates
>            Assignee: Alan Gates
>         Attachments: optimizer.patch, optimizer2.patch
>
>
> We need to add an optimizer to pig.  This will enable us to do some 
> traditional optimizations, such as filter and projection pushing, join order 
> and execution choices, etc.  It will also enable optimizations specific to 
> map/reduce (such as using the combiner).
> The optimizer will need to operate at various levels, including the logical, 
> physical, and possibly map/reduce plan levels.

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