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- ADDCOLUMNS is an iterator and a table function. It receives first, the first argument that needs to be a table. ADDCOLUMNS returns the full table. Then during the iteration, it can create new columns. For each column that you want to add to the output, you need to provide both the name of the column and the expression. The expression is evaluated in the row context during the iteration and that is why if you want to create a filter context out of the row context, you need to rely on context transition and use CALCULATE in order to compute your numbers. Lets see that with a couple of examples. You see that we are using, in this query, ADDCOLUMNS that iterate over the values of the calendar year. So for each year ADDCOLUMNS evaluates the further arguments. We provide a name and then an expression that is evaluated in the row context of ADDCOLUMNS. This is why you can reference date calendar year, as we are doing here, to extract the value of a specific column. The first column, year