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Recently I came across some code in a framework that was performing different calculations on data as it was retrieved from data source. The framework had a set of derived columns, each of which represented a set of predefined calculations against the retrieved data. For example, we may have had a Sum column which was responsible for adding the values of two other columns together. We also may have had a Difference column which was responsible for subtracting the value of one column from another column. This is a pretty common, straight forward situation which I'm sure that nearly everyone has encountered at some point in their career.