anyone know of a good extension to relational algebra that adds grouping/ungrouping as first-level concepts?
@hadleywickham Spark's API is effectively this (groupBy and reduceByKey are the relevant primitives, I think).
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@avibryant do you know of any algebra type work showing that relational algebra + group/ungroup is equivalent to...Thanks. Twitter will use this to make your timeline better. UndoUndo
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