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I can not select rows using in-kernel queries with a condition that involves an UInt64Col. Why?

April 26, 2017condition involves queries rows select

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I can not select rows using in-kernel queries with a condition that involves an UInt64Col. Why?

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This turns out to be a limitation of the numexpr package. Internally, numexpr uses a limited set of types for doing calculations, and unsigned integers are always upcasted to the immediate signed integer that can fit the information. The problem here is that there is not a (standard) signed integer that can be used to keep the information of a 64-bit unsigned integer.