Ying He updated PIG-480:

    Attachment: PIG_480.patch

fix the compilation error.

> PERFORMANCE: Use identity mapper in a chain of M-R jobs
> -------------------------------------------------------
>                 Key: PIG-480
>                 URL: https://issues.apache.org/jira/browse/PIG-480
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.2.0
>            Reporter: Olga Natkovich
>            Assignee: Ying He
>         Attachments: PIG_480.patch, PIG_480.patch
> For jobs with two or more MR jobs, use identity mapper wherever possible in 
> second and subsequent MR jobs. Identity mapper is about 50% than pig empty 
> map job because it doesn't parse the data. 

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