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https://issues.apache.org/jira/browse/PIG-1022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784279#action_12784279
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Alan Gates commented on PIG-1022:
---------------------------------

+1, patch looks good.  I also reran the unit tests since it had been a while 
since this patch was posted, and they all still pass.

> optimizer pushes filter before the foreach that generates column used by 
> filter
> -------------------------------------------------------------------------------
>
>                 Key: PIG-1022
>                 URL: https://issues.apache.org/jira/browse/PIG-1022
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.4.0
>            Reporter: Thejas M Nair
>            Assignee: Daniel Dai
>             Fix For: 0.6.0
>
>         Attachments: PIG-1022-1.patch
>
>
> grunt> l = load 'students.txt' using PigStorage() as (name:chararray, 
> gender:chararray, age:chararray, score:chararray);
> grunt> f = foreach l generate name, gender, age,score, '200'  as 
> gid:chararray;
> grunt> g = group f by (name, gid);
> grunt> f2 = foreach g generate group.name as name: chararray, group.gid as 
> gid: chararray;
> grunt> filt = filter f2 by gid == '200';
> grunt> explain filt;
> In the plan generated filt is pushed up after the load and before the first 
> foreach, even though the filter is on gid which is generated in first foreach.

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