CUBE operation in Pig
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Key: PIG-2167
URL: https://issues.apache.org/jira/browse/PIG-2167
Project: Pig
Issue Type: New Feature
Reporter: Dmitriy V. Ryaboy
Fix For: 0.10
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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