Function mz_sql::query_model::rewrite::rule::simplify_outer_joins::map_nulls_to_inputs

fn map_nulls_to_inputs(
    ancestral_rejected_nulls: &mut HashSet<ColumnReference>,
    box: &BoundRef<'_, QueryBox>
)

Map (rejected nulls from any ancestor of box, expressed as column references from an input of the parent of box) -> (column references from an input of box)