backend tests progress

include/matador/sql/connection.hpp

@@ -39,10 +39,13 @@ public:
 
   statement prepare(query_context &&query) const;
 
+  const class dialect& dialect() const;
+
 private:
   connection_info connection_info_;
   std::unique_ptr<connection_impl> connection_;
   utils::logger logger_;
+  const class dialect &dialect_;
 };
 
 }