Function groups_merge_batch

datafusion/functions-aggregate/src/string_agg.rs:892–909

()

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

        // First batch: group 0 = "a", group 1 = "b"
        let values: ArrayRef = Arc::new(LargeStringArray::from(vec!["a", "b"]));
        acc.update_batch(&[values], &[0, 1], None, 2)?;

        // Simulate a second accumulator's state (LargeUtf8 partial strings)
        let partial_state: ArrayRef = Arc::new(LargeStringArray::from(vec!["c,d", "e"]));
        acc.merge_batch(&[partial_state], &[0, 1], None, 2)?;

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

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