Method distinct

datafusion/functions-aggregate/src/array_agg.rs:1543–1546

(mut self)

        }

        fn distinct(mut self) -> Self {
            self.distinct = true;
            self
        }

        fn order_by_col(mut self, col: &str, sort_options: SortOptions) -> Self {
            let new_order = PhysicalSortExpr::new(