query compiler progress

backends/postgres/src/postgres_connection.cpp

@@ -58,7 +58,7 @@ std::unique_ptr<sql::query_result_impl> postgres_connection::fetch(const std::st
     auto type = PQftype(res, i);
     auto size = PQfmod(res, i);
 //    std::cout << "column " << col_name << ", type " << type << " (size: " << size << ")\n";
-    prototype.append({col_name});
+    prototype.append(sql::column_definition{col_name});
   }
   return std::move(std::make_unique<sql::query_result_impl>(std::make_unique<postgres_result_reader>(res), std::move(prototype)));
 }