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https://issues.apache.org/jira/browse/PIG-785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Gates resolved PIG-785.
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       Resolution: Won't Fix
    Fix Version/s: 0.2.0

This is intentional.  While we still support user defined order by functions, 
they were initially put there only to deal with the fact that 0.1.x didn't 
handle numeric or descending ordering.  Since those are included in 0.2.0, 
we're deprecating user defined ordering.

> documentation about USING clause in ORDER BY missing
> ----------------------------------------------------
>
>                 Key: PIG-785
>                 URL: https://issues.apache.org/jira/browse/PIG-785
>             Project: Pig
>          Issue Type: Bug
>          Components: documentation
>            Reporter: Thejas M Nair
>             Fix For: 0.2.0
>
>
> Order by relational operator supports the use of user defined functions for 
> custom ordering. 
> eg -
>   X = ORDER A BY a1,a2,a3  USING myFunction();
> But it is not documented.

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