code: protected String replaceGroupNameVariables(String str,
              List<String> groupNames, List<String> groupValues, boolean debugPrint) {
          return str;
      }
docs: Potentially returns the specified String, after replacing certain
  "variables", such as {table} or {column:pk}, in a QueryTransformer's
  prefix, suffix or (group) replacement text, for which a corresponding
  group value will be substituted. However, this base version just
  returns the original String unchanged; it may be overridden by
  sub-classes, to determine appropriate changes for that non-VoltDB
  backend database.