Santhosh Srinivasan commented on PIG-922:

For relational operators that require multiple inputs, the list will correspond 
to each of its inputs. If you notice getRequiredFields, the list is populated 
on a per input basis. In the case of getRequiredInputs, I see that the use of 
the list is not consistent.for LOJoin, LOUnion, LOCogroup and LOCross.

> 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: 0.4.0
>         Attachments: PIG-922-p1_0.patch, PIG-922-p1_1.patch, 
> PIG-922-p1_2.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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