Function encode_validity_bitmap

nodedb-columnar/src/writer/encode.rs:31–40

Encode a validity bitmap: ceil(N/8) bytes, bit=0 means null, bit=1 means valid.

(valid: &[bool])

/// Encode a validity bitmap: ceil(N/8) bytes, bit=0 means null, bit=1 means valid.
pub(super) fn encode_validity_bitmap(valid: &[bool]) -> Vec<u8> {
    let byte_count = valid.len().div_ceil(8);
    let mut bitmap = vec![0u8; byte_count];
    for (i, &v) in valid.iter().enumerate() {
        if v {
            bitmap[i / 8] |= 1 << (i % 8);
        }
    }
    bitmap
}

/// Prepend a validity bitmap to compressed data.
pub(super) fn prepend_validity(valid: &[bool], compressed: &[u8]) -> Vec<u8> {