Daniel Dai updated PIG-922:

    Attachment: PIG-922-p3_14.patch

Address the review comments from Pradeep. Actually we do not need to do 
anything special for order by. We only prune columns on the upfront LOLoad in 
the logical plan. Order by will read intermediate input file (In the case if we 
do not have input schema, order by will read user input file directly, however, 
prune columns only kick in when user give an input schema, so it is not the 
case), nothing will be pruned. 

> Logical optimizer: push up project
> ----------------------------------
>                 Key: PIG-922
>                 URL: https://issues.apache.org/jira/browse/PIG-922
>             Project: Pig
>          Issue Type: New Feature
>          Components: impl
>    Affects Versions: 0.3.0
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>             Fix For: 0.6.0
>         Attachments: PIG-922-p1_0.patch, PIG-922-p1_1.patch, 
> PIG-922-p1_2.patch, PIG-922-p1_3.patch, PIG-922-p1_4.patch, 
> PIG-922-p2_preview.patch, PIG-922-p2_preview2.patch, PIG-922-p3_1.patch, 
> PIG-922-p3_10.patch, PIG-922-p3_11.patch, PIG-922-p3_12.patch, 
> PIG-922-p3_13.patch, PIG-922-p3_14.patch, PIG-922-p3_2.patch, 
> PIG-922-p3_3.patch, PIG-922-p3_4.patch, PIG-922-p3_5.patch, 
> PIG-922-p3_6.patch, PIG-922-p3_7.patch, PIG-922-p3_8.patch, PIG-922-p3_9.patch
> This is a continuation work of 
> [PIG-697|https://issues.apache.org/jira/browse/PIG-697]. We need to add 
> another rule to the logical optimizer: Push up project, ie, prune columns as 
> early as possible.

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