Function build_group_key

nodedb-query/src/msgpack_scan/group_key.rs:17–32

Build a GROUP BY key string from raw msgpack bytes. Format: `[val1,val2,...]` where values are formatted as JSON literals. This is compatible with the legacy `sonic_rs::to_string(&key_parts)` format, so the result-construction code can parse it back with `sonic_rs::from_str`.

(doc: &[u8], group_fields: &[String])

/// This is compatible with the legacy `sonic_rs::to_string(&key_parts)` format,
/// so the result-construction code can parse it back with `sonic_rs::from_str`.
pub fn build_group_key(doc: &[u8], group_fields: &[String]) -> String {
    if group_fields.is_empty() {
        return "__all__".to_string();
    }

    let mut key_buf = String::new();
    key_buf.push('[');
    for (i, field) in group_fields.iter().enumerate() {
        if i > 0 {
            key_buf.push(',');
        }
        append_field_value(&mut key_buf, doc, field);
    }
    key_buf.push(']');
    key_buf
}

/// Build a GROUP BY key using a pre-built `FieldIndex` for O(1) lookups.
pub fn build_group_key_indexed(doc: &[u8], group_fields: &[String], idx: &FieldIndex) -> String {