Function decode_nulls

arrow-row/src/fixed.rs:420–429

Decodes a single byte from each row, interpreting `0x01` as a valid value and all other values as a null Returns the null count and null buffer

(rows: &[&[u8]])

///
/// Returns the null count and null buffer
pub fn decode_nulls(rows: &[&[u8]]) -> (usize, Buffer) {
    let mut null_count = 0;
    let buffer = MutableBuffer::collect_bool(rows.len(), |idx| {
        let valid = rows[idx][0] == 1;
        null_count += !valid as usize;
        valid
    })
    .into();
    (null_count, buffer)
}

/// Decodes a `ArrayData` from rows based on the provided `FixedLengthEncoding` `T`
///