Daniel Dai updated PIG-922:

    Attachment: PIG-922-p2_preview.patch

Include initial patch for phase 2 (inclusive). Need more test, but upload patch 
first for comments.

This patch include these codes:
1. Prune inputs for relational operator
2. Recursively prune inputs from root of a logical plan
3. PigStorage with input pruning

Yet to do:
1. Map key pruning for a map input
2. Transformation rule to collect required fields and prune unused columns down

> 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
>         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
> 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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