Function first_value

datafusion/functions-window/src/nth_value.rs:579–591

()

    #[test]
    fn first_value() -> Result<()> {
        let expr = Arc::new(Column::new("c3", 0)) as Arc<dyn PhysicalExpr>;
        test_i32_result(
            NthValue::first(),
            PartitionEvaluatorArgs::new(
                &[expr],
                &[Field::new("f", DataType::Int32, true).into()],
                false,
                false,
            ),
            Int32Array::from(vec![1; 8]).iter().collect::<Int32Array>(),
        )
    }

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