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From "Dmitriy V. Ryaboy (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2167) CUBE operation in Pig
Date Tue, 27 Mar 2012 22:26:28 GMT

    [ https://issues.apache.org/jira/browse/PIG-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240008#comment-13240008
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Dmitriy V. Ryaboy commented on PIG-2167:
----------------------------------------

I wouldn't put too much weight on timing local mode. You are likely spending most of the time
in JobControl's sleep(5000). We'll see about posting our patch for that.

                
> CUBE operation in Pig
> ---------------------
>
>                 Key: PIG-2167
>                 URL: https://issues.apache.org/jira/browse/PIG-2167
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Dmitriy V. Ryaboy
>              Labels: gsoc2012, mentor
>         Attachments: PIG-2167.1.patch, Pig-Cubing-Performance.png
>
>
> Computing aggregates over a cube of several dimensions is a common operation in data
warehousing.
> The standard SQL syntax is "GROUP relation BY dim1, dim2, dim3 WITH CUBE" -- which in
addition to all dim1-2-3, produces aggregations for just dim1, just dim1 and dim2, etc. NULL
is generally used to represent "all".
> A presentation by Arnab Nandi describes how one might implement efficient cubing in Map-Reduce
here: http://pdf.cx/44wrk
> We can start with the naive solution which only works for algebraic measures, and work
up from there.
> 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

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