Function generate_string_array

datafusion/functions-nested/src/string.rs:565–588

(
    list_arr: &GenericListArray<O>,
    delimiters: &[Option<&str>],
    null_strings: &[Option<&str>],
)

}

fn generate_string_array<O: OffsetSizeTrait>(
    list_arr: &GenericListArray<O>,
    delimiters: &[Option<&str>],
    null_strings: &[Option<&str>],
) -> Result<StringArray> {
    let mut builder = StringBuilder::with_capacity(list_arr.len(), 0);

    for ((arr, &delimiter), &null_string) in list_arr
        .iter()
        .zip(delimiters.iter())
        .zip(null_strings.iter())
    {
        let (Some(arr), Some(delimiter)) = (arr, delimiter) else {
            builder.append_null();
            continue;
        };

        let mut first = true;
        compute_array_to_string(&mut builder, &arr, delimiter, null_string, &mut first)?;
        builder.append_value("");
    }

    Ok(builder.finish())
}

fn compute_array_to_string(
    w: &mut impl Write,