Controls when profile is output. Exact: only when superset side columns form an exact key in the superset side table or view, ...

Controls when profile is output. Exact: only when superset side columns form an exact key in the superset side table or view, Specified: only when superset side columns' key strength in the superset side table or view is above the threshold specified in SupersetColumnsKeyThreshold, None: output profile regardless of its superset side columns' key strength in the superset side table or view.