Function round_arrays

datafusion/functions/src/math/round.rs:736–756

(
        value: ArrayRef,
        decimal_places: Option<ArrayRef>,
    )

    use datafusion_expr::ColumnarValue;

    fn round_arrays(
        value: ArrayRef,
        decimal_places: Option<ArrayRef>,
    ) -> Result<ArrayRef, DataFusionError> {
        let number_rows = value.len();
        // NOTE: For decimal inputs, the actual ROUND return type can differ from the
        // input type (scale reduction for literal `decimal_places`). These unit tests
        // only exercise Float32/Float64 behavior.
        let return_type = value.data_type().clone();
        let value = ColumnarValue::Array(value);
        let decimal_places = decimal_places
            .map(ColumnarValue::Array)
            .unwrap_or_else(|| ColumnarValue::Scalar(ScalarValue::Int32(Some(0))));

        let result =
            super::round_columnar(&value, &decimal_places, number_rows, &return_type)?;
        match result {
            ColumnarValue::Array(array) => Ok(array),
            ColumnarValue::Scalar(scalar) => scalar.to_array_of_size(1),
        }
    }

    #[test]
    fn test_round_f32() {