Function sort_aggregated_rows

nodedb/src/data/executor/handlers/aggregate.rs:119–134

Sort aggregated rows by `sort_keys = [(column, ascending), ...]`. Each row is a `serde_json::Value::Object`; for every key, the extracted value is converted to a comparable form (numbers compared numerically, strings lexically, nulls last). Keys missing from a row sort as null. The sort is stable to preserve relative order of equal-key rows.

(rows: &mut [serde_json::Value], sort_keys: &[(String, bool)])

/// row sort as null. The sort is stable to preserve relative order of
/// equal-key rows.
fn sort_aggregated_rows(rows: &mut [serde_json::Value], sort_keys: &[(String, bool)]) {
    if sort_keys.is_empty() {
        return;
    }
    rows.sort_by(|a, b| {
        for (column, ascending) in sort_keys {
            let av = a.get(column);
            let bv = b.get(column);
            let ord = compare_json_values(av, bv);
            if ord != std::cmp::Ordering::Equal {
                return if *ascending { ord } else { ord.reverse() };
            }
        }
        std::cmp::Ordering::Equal
    });
}

/// Compare two `Option<&serde_json::Value>` for sort. Nulls / absent
/// keys sort last; numbers compare numerically; everything else falls