Function handle_zrank

nodedb/src/control/server/resp/handler_sorted.rs:114–139

ZRANK key member — returns 0-based rank (Redis convention).

(
    cmd: &RespCommand,
    session: &RespSession,
    state: &SharedState,
)

/// ZRANK key member — returns 0-based rank (Redis convention).
pub(super) async fn handle_zrank(
    cmd: &RespCommand,
    session: &RespSession,
    state: &SharedState,
) -> RespValue {
    let Some(member) = cmd.arg(0) else {
        return RespValue::err("ERR wrong number of arguments for 'zrank' command");
    };

    let plan = PhysicalPlan::Kv(KvOp::SortedIndexRank {
        index_name: session.collection.clone(),
        primary_key: member.to_vec(),
    });

    match dispatch_kv(state, session, plan).await {
        Ok(resp) if resp.status == Status::Ok => {
            let rank = parse_json_field_i64(&resp.payload, "rank");
            match rank {
                Some(r) if r > 0 => RespValue::integer(r - 1), // Convert to 0-based.
                _ => RespValue::nil(),
            }
        }
        Ok(_) => RespValue::nil(),
        Err(e) => RespValue::err(format!("ERR {e}")),
    }
}

/// ZRANGE key start stop — returns members in rank range [start, stop] (0-based).
pub(super) async fn handle_zrange(