Pradeep Kamath commented on PIG-922:

I reviewed the changes to pass the load signature to the slicer/Slice and 
PigStorage for column pruning to work on the backend - the changes look good. 
The one change I wasn't clear about was the use of signature in order by since 
currently LOSort's alias is used as the signature and that would not be useful 
to the Slicer/slice or PigStorage in the backend since they would expect the 
LOLoad's alias.

> 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_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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