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Dmitriy V. Ryaboy commented on PIG-2167:
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Assigning to self as per apache guidelines, as I'd like to mentor this. Putting my application
in right now.
> 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
> Assignee: 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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