code: private ExprKraken parseSelectExpr()
    {
      Token token = scanToken();
  
      if (token == Token.STAR) {
        // return new UnboundStarExpr();
        
        throw new UnsupportedOperationException(getClass().getName());
      }
      else {
        _token = token;
  
        return parseExpr();
      }
    }
docs: Parses a select expression.