Function extract_string

nodedb-strict/src/arrow_extract.rs:201–231

(
    decoder: &TupleDecoder,
    tuples: &[&[u8]],
    col_idx: usize,
    n: usize,
)

}

fn extract_string(
    decoder: &TupleDecoder,
    tuples: &[&[u8]],
    col_idx: usize,
    n: usize,
) -> Result<ArrayRef, StrictError> {
    let (null_buf, null_count) = build_null_buffer(decoder, tuples, col_idx)?;
    let mut strs: Vec<Option<&str>> = Vec::with_capacity(n);

    for tuple in tuples {
        if let Some(raw) = decoder.extract_variable_raw(tuple, col_idx)? {
            strs.push(Some(std::str::from_utf8(raw).unwrap_or("")));
        } else {
            strs.push(None);
        }
    }

    let array = StringArray::from(strs);
    // Reapply our null buffer in case of nulls not captured by Option.
    if null_count > 0 {
        let data = array
            .into_data()
            .into_builder()
            .null_bit_buffer(Some(null_buf.into_inner().into_inner()))
            .build()
            .expect("arrow array builder lengths are consistent");
        Ok(Arc::new(StringArray::from(data)))
    } else {
        Ok(Arc::new(array))
    }
}

fn extract_binary(
    decoder: &TupleDecoder,