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From "Ajay Garg (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-296) UDF for cumulative statistics
Date Sat, 12 Jul 2008 17:11:31 GMT

     [ https://issues.apache.org/jira/browse/PIG-296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ajay Garg updated PIG-296:
--------------------------

    Attachment: newCumulative.patch

updated patch attached(newCumulative.patch) which arrange the tuples in decreasing order before
combining them to maintain the order. Please look at it and comment. 
Thanks

> UDF for cumulative statistics
> -----------------------------
>
>                 Key: PIG-296
>                 URL: https://issues.apache.org/jira/browse/PIG-296
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Ajay Garg
>            Priority: Minor
>         Attachments: cumulative.patch, newCumulative.patch
>
>
> udf for computive cumulative sum, row, rank, dense rank.  
> To use 
> A = load 'data' using PigStorage as ( query, freq );
> B = group A all;
> C = foreach B {
>     Ordered = order A by freq using numeric.OrderDescending;
>     generate
>         statistics.CUMULATIVE_COLUMN(Ordered, 1) as   -- Pig starts with 0th column,
this refers to the column freq by offset
>                 ( query, freq, freq_cumulative_sum, freq_row, freq_rank, freq_dense_rank
);
> };
> D = foreach C generate FLATTEN(A);

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