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https://issues.apache.org/jira/browse/PIG-877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730525#action_12730525
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Santhosh Srinivasan commented on PIG-877:
-----------------------------------------

Its at Optimization time.

> Push up filter does not account for added columns in foreach
> ------------------------------------------------------------
>
>                 Key: PIG-877
>                 URL: https://issues.apache.org/jira/browse/PIG-877
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.3.1
>            Reporter: Santhosh Srinivasan
>            Assignee: Santhosh Srinivasan
>             Fix For: 0.3.1
>
>         Attachments: PIG-877.patch
>
>
> If a filter follows a foreach that produces an added column then push up 
> filter fails with a null pointer exception.
> {code}
> ...
> x = foreach w generate $0, COUNT($1);
> y = filter x by $1 > 10;
> {code}
> In the above example, the column in the filter's expression is an added 
> column. As a result, the optimizer rule is not able to map it back to the 
> input resulting in a null value. The subsequent for loop is failing due to 
> NPE.

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