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From "Rekha (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-821) simulate NTILE(n) , rank() functionality in pig
Date Thu, 28 May 2009 11:14:45 GMT

    [ https://issues.apache.org/jira/browse/PIG-821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713942#action_12713942
] 

Rekha commented on PIG-821:
---------------------------

Hi,

I searched the jars and am trying with statistics.QUANTILES for NTILE().Not sure if it will
work, am trying.
For rank(), please suggest.

Thanks & Regards,
/Rekha.

> 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
>             Fix For: 0.2.0
>
>
> 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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