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https://issues.apache.org/jira/browse/PIG-1022?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Dai reassigned PIG-1022:
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Assignee: Daniel Dai
> 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
> Reporter: Thejas M Nair
> Assignee: Daniel Dai
>
> 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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