Function groups_basic

datafusion/functions-aggregate/src/string_agg.rs:807–826

()

    #[test]
    fn groups_basic() -> Result<()> {
        let mut acc = make_groups_acc(",");

        // 6 rows, 3 groups: group 0 gets "a","d"; group 1 gets "b","e"; group 2 gets "c","f"
        let values: ArrayRef =
            Arc::new(LargeStringArray::from(vec!["a", "b", "c", "d", "e", "f"]));
        let group_indices = vec![0, 1, 2, 0, 1, 2];
        acc.update_batch(&[values], &group_indices, None, 3)?;

        let result = evaluate_groups(&mut acc, EmitTo::All);
        assert_eq!(
            result,
            vec![
                Some("a,d".to_string()),
                Some("b,e".to_string()),
                Some("c,f".to_string()),
            ]
        );
        Ok(())
    }

    #[test]
    fn groups_with_nulls() -> Result<()> {