Function value_to_string_view

arrow-cast/src/cast/string.rs:41–63

(
    array: &dyn Array,
    options: &CastOptions,
)

}

pub(crate) fn value_to_string_view(
    array: &dyn Array,
    options: &CastOptions,
) -> Result<ArrayRef, ArrowError> {
    let mut builder = StringViewBuilder::with_capacity(array.len());
    let formatter = ArrayFormatter::try_new(array, &options.format_options)?;
    let nulls = array.nulls();
    // buffer to avoid reallocating on each value
    // TODO: replace with write to builder after https://github.com/apache/arrow-rs/issues/6373
    let mut buffer = String::new();
    for i in 0..array.len() {
        match nulls.map(|x| x.is_null(i)).unwrap_or_default() {
            true => builder.append_null(),
            false => {
                // write to buffer first and then copy into target array
                buffer.clear();
                formatter.value(i).write(&mut buffer)?;
                builder.append_value(&buffer)
            }
        }
    }
    Ok(Arc::new(builder.finish()))
}

/// Parse UTF-8
pub(crate) fn parse_string<P: Parser, O: OffsetSizeTrait>(