The abstract theory describes Current Row Filtering and Override Filters within DAX (Data Analysis Expressions), where revisors act as mechanisms to modify filter contexts prior to subexpression execution. The core principle states that a revisor first performs automatic current row filtering by adding values from the iterating rows, followed optionally by explicit override filters provided via arguments before unfreezing the context for evaluation. This mechanism ensures that iterative calculations operate within the specific filtered subset corresponding to each row's context rather than relying on an empty or unintended global filter state.
The abstract theory describes Current Row Filtering and Override Filters within DAX (Data Analysis Expressions), where revisors act as mechanisms to modify filter contexts prior to subexpression exec…