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https://issues.apache.org/jira/browse/PIG-821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12996939#comment-12996939
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David Ciemiewicz commented on PIG-821:
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Oops, I realized I reversed the implementation of rank and dense rank in the
example above. Can't figure out how to go back and edit the example in the
comment. :-/
> simulate NTILE(n) , rank() functionality in pig
> -----------------------------------------------
>
> Key: PIG-821
> URL: https://issues.apache.org/jira/browse/PIG-821
> Project: Pig
> Issue Type: New Feature
> Components: impl
> Affects Versions: 0.2.0
> Environment: mithril gold -gateway 4000
> Reporter: Rekha
>
> Hi,
> I came across a job which has some processing which I cant seem to get easily
> over-the-counter from pig.
> These are NTILE() /rank() operations available in oracle.
> While I am trying to write a UDF, that is not working out too well for me
> yet.. :(
> I have a ntile(n) over (partititon by x, y, z order by a desc, b desc)
> operation to be done in pig scripts.
> Is there a default function in pig scripting which can do this?
> For example, lets consider a simple example at
> http://download.oracle.com/docs/cd/B14117_01/server.101/b10759/functions091.htm
> So here, how would we ideally substitute NTILE() with? any pig counterpart
> function/udf?
> SELECT last_name, salary, NTILE(4) OVER (ORDER BY salary DESC)
> AS quartile FROM employees
> WHERE department_id = 100;
>
> LAST_NAME SALARY QUARTILE
> ------------------------- ---------- ----------
> Greenberg 12000 1
> Faviet 9000 1
> Chen 8200 2
> Urman 7800 2
> Sciarra 7700 3
> Popp 6900 4
>
> In real case, i have ntile over multiple columns, so ideal way to find
> histograms/boundary/spitting out the bucket number is needed.
> Similarly a pig function is required for rank() over(partition by a,b,c order
> by d desc) as e
> Please let me know soon.
> Thanks & Regards,
> /Rekha
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