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TopCount and very large sets

Today I came accross an unexpected problem. I am working with a partner on a local government project. He reported an MDX error "The expression contains a function that cannot operate on a set with more than 4,294,967,296 tuples." The function concerned was TopCount although I suspect that TopSum and TopPercent would display the same behavior. The query was asking for a set:

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Tags: mdx

 

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