Function make_array_inner

datafusion/spark/src/function/array/spark_array.rs:112–137

`make_array_inner` is the implementation of the `make_array` function. Constructs an array using the input `data` as `ArrayRef`. Returns a reference-counted `Array` instance result.

(arrays: &[ArrayRef])

/// Constructs an array using the input `data` as `ArrayRef`.
/// Returns a reference-counted `Array` instance result.
pub fn make_array_inner(arrays: &[ArrayRef]) -> Result<ArrayRef> {
    let mut data_type = DataType::Null;
    for arg in arrays {
        let arg_data_type = arg.data_type();
        if !arg_data_type.equals_datatype(&DataType::Null) {
            data_type = arg_data_type.clone();
            break;
        }
    }

    match data_type {
        // Either an empty array or all nulls:
        DataType::Null => {
            let length = arrays.iter().map(|a| a.len()).sum();
            // By default Int32
            let array = new_null_array(&DataType::Null, length);
            Ok(Arc::new(
                SingleRowListArrayBuilder::new(array)
                    .with_nullable(true)
                    .with_field_name(Some(ARRAY_FIELD_DEFAULT_NAME.to_string()))
                    .build_list_array(),
            ))
        }
        _ => array_array::<i32>(arrays, data_type, ARRAY_FIELD_DEFAULT_NAME),
    }
}