query-result-set: Add rows() accessor function

Add rows() accessor function for iterating over the whole result set.

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

query-result-set.hh

@@ -88,6 +88,9 @@ public:
         }
         return _rows[idx];
     }
+    const std::vector<result_set_row>& rows() const {
+        return _rows;
+    }
     friend inline bool operator==(const result_set& x, const result_set& y);
     friend std::ostream& operator<<(std::ostream& out, const result_set& rs);
 };