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https://issues.apache.org/jira/browse/PIG-2353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13535506#comment-13535506
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Jonathan Coveney commented on PIG-2353:
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You cannot, so this is not without precedent. We should document it, and
ideally introduce better error messages around it (separate JIRA, and for other
keywords it is equally as bad).
> RANK function like in SQL
> -------------------------
>
> Key: PIG-2353
> URL: https://issues.apache.org/jira/browse/PIG-2353
> Project: Pig
> Issue Type: New Feature
> Reporter: Gianmarco De Francisci Morales
> Assignee: Allan Avendaño
> Labels: gsoc2012, mentor
> Fix For: 0.11
>
> Attachments: PIG-2353-2, PIG-2353-3.txt, PIG-2353-4.txt,
> PIG-2353-5.txt, PIG2353.patch
>
>
> Implement a function that given a (sorted) bag adds to each tuple a unique,
> increasing identifier without gaps, like what RANK does for SQL.
> This is a candidate project for Google summer of code 2012. More information
> about the program can be found at
> https://cwiki.apache.org/confluence/display/PIG/GSoc2012
> Functionality implemented so far, is available at
> https://reviews.apache.org/r/5523/diff/#index_header
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