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https://issues.apache.org/jira/browse/PIG-2353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174412#comment-13174412
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Jonathan Coveney commented on PIG-2353:
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I see no reason why it couldn't do both. The grammar syntax could be
{code}
RANK relation ( BY column )? such that if you specify the column to rank by,
it'll sort it, but if you don't, it just sorts it as it got it.
> 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
> Attachments: 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.
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