I ran into this same issue on this stackoverflow post…

http://stackoverflow.com/questions/18963248/how-can-i-have-null-column-value-for-a-composite-key-column-in-cql3

Does anyone know how to have the same composite column name pattern that 
enables wide rows with a null value?

Ie. We had some index rows that were nullable Integers and the postfix was the 
primary key of another table and we could look up null to find the rows that 
all had null for something.  Does this even work in CQL3 or is it so that we 
cannot port this wide row to CQL3?  (though I thought every pattern was 
supposed to be portable to CQL3)

Thanks,
Dean

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