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https://issues.apache.org/jira/browse/PIG-887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thejas M Nair resolved PIG-887.
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    Resolution: Fixed

Use of expressions in join/group/cogroup is documented in pig-latin reference 
manual - http://hadoop.apache.org/pig/docs/r0.5.0/piglatin_reference.html

> document use of expressions in join,group,cogroup
> -------------------------------------------------
>
>                 Key: PIG-887
>                 URL: https://issues.apache.org/jira/browse/PIG-887
>             Project: Pig
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Thejas M Nair
>            Assignee: Corinne Chandel
>
> For join,group,cogroup relational operators, pig allows expressions to be 
> used in place of the field aliases in the syntax documented in 
> http://wiki.apache.org/pig-data/attachments/FrontPage/attachments/plrm.htm .
> But this feature is not documented in the manual.

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