Conceptual

DAX CALCULATE Override Filters and Automatic Filter Context Restoration

In DAX (DirectQuery for Analysis), a filter revisor functions by establishing a revised filter context through a specific sequence: first evaluating current row filtering via iterator expressions, and subsequently applying override filters provided as arguments subsequent to the expression. This mechanism allows the execution of an arbitrary sub-expression within this newly constructed, isolated logical environment before automatically restoring the original global filter state post-evaluation.