Method build_key

nodedb/src/engine/kv/index.rs:158–167

Build a composite key from individual field values. Values are concatenated with `\0` separator. This preserves lexicographic ordering for prefix scans on leading fields. Limitation:** field values must not contain null bytes (`\0`), as they are used as separators. This holds for typical KV keys (strings, UUIDs, integers encoded as big-endian bytes).

(values: &[&[u8]])

    /// are used as separators. This holds for typical KV keys (strings, UUIDs,
    /// integers encoded as big-endian bytes).
    fn build_key(values: &[&[u8]]) -> Vec<u8> {
        let mut key = Vec::new();
        for (i, v) in values.iter().enumerate() {
            if i > 0 {
                key.push(0); // Null separator.
            }
            key.extend_from_slice(v);
        }
        key
    }

    /// Insert a composite entry.
    pub fn insert(&mut self, field_values: &[&[u8]], primary_key: Vec<u8>) {