BSONObj shapifyQuery(const ParsedUpdate& parsedUpdate, const SerializationOptions& opts) {
    // Use the already-parsed query ('q' field) if we have it to avoid re-parsing.
    if (parsedUpdate.hasParsedFindCommand()) {
        auto matchExpr = parsedUpdate.parsedFind->filter.get();
        return matchExpr ? matchExpr->serialize(opts) : BSONObj{};
    }
    // Fast path for simple _id queries - construct shape directly without parsing.
    // We know the query is something like {_id: <value>}
    const auto& query = parsedUpdate.getRequest()->getQuery();
    BSONElement idElem = query["_id"];
    tassert(11193001, "Expected simple _id query", !idElem.eoo());
    BSONObjBuilder result;
    BSONObjBuilder idObj(result.subobjStart("_id"));
    opts.appendLiteral(&idObj, "$eq", idElem);
    idObj.doneFast();
    return result.obj();
}