Someone please show me a better way to do this

kvrow.hh

@@ -279,15 +279,7 @@ class query_json_scanner {
     bool visit_value(Str key, R* value, threadinfo& ti) {
         if (row_is_marker(value))
             return true;
-        // NB the `key` is not stable! We must save space for it.
-        while (q_.scankeypos_ + key.length() > q_.scankey_.length()) {
-            q_.scankey_ = lcdf::String::make_uninitialized(q_.scankey_.length() ? q_.scankey_.length() * 2 : 1024);
-            q_.scankeypos_ = 0;
-        }
-        memcpy(const_cast<char*>(q_.scankey_.data() + q_.scankeypos_),
-               key.data(), key.length());
-        request_.push_back(q_.scankey_.substr(q_.scankeypos_, key.length()));
-        q_.scankeypos_ += key.length();
+        request_.push_back(*(new lcdf::String(key)));
         request_.push_back(lcdf::Json());
         q_.emit_fields1(value, request_.back(), ti);
         --nleft_;
@@ -337,15 +329,7 @@ void query<R>::run_iscan(T& table, Json& request, threadinfo& ti) {
         R* value = it->second;
         if (row_is_marker(value))
             break;
-        // NB the `key` is not stable! We must save space for it.
-        while (scankeypos_ + key.length() > scankey_.length()) {
-            scankey_ = lcdf::String::make_uninitialized(scankey_.length() ? scankey_.length() * 2 : 1024);
-            scankeypos_ = 0;
-        }
-        memcpy(const_cast<char*>(scankey_.data() + scankeypos_),
-               key.data(), key.length());
-        request.push_back(scankey_.substr(scankeypos_, key.length()));
-        scankeypos_ += key.length();
+        request.push_back(*(new lcdf::String(key)));
         request.push_back(lcdf::Json());
         emit_fields1(value, request.back(), ti);
         it++;