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Posted to dev@pig.apache.org by "Daniel Dai (Updated) (JIRA)" <ji...@apache.org> on 2012/03/14 00:38:40 UTC

[jira] [Updated] (PIG-2167) CUBE operation in Pig

     [ https://issues.apache.org/jira/browse/PIG-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Dai updated PIG-2167:
----------------------------

    Labels: gsoc2012  (was: )
    
> 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
>
> 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.

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