An iterator function is a mechanism within the DAX domain that generates a new value (scalar) or a transformed temporary table by aggregating rows from a specific input dataset provided in argument 1 and evaluating an expression column defined in argument 2. These functions operate under filter context constraints, where only visible data subsets are processed to produce results such as sums, minimums/maximums, averages, or filtered sub-tables based on logical evaluations of the temporary column's values. This theoretical framework relies on the formal distinction between stable physical table structures and ephemeral expression columns designed solely for immediate computational aggregation before being discarded after value generation.
An iterator function is a mechanism within the DAX domain that generates a new value (scalar) or a transformed temporary table by aggregating rows from a specific input dataset provided in argument 1…