# File test/src/sql_parser.rb, line 243
  def assemble
    pred = nil
    rel = nil
    lazy_predicate = lazy{pred}
    lazy_rel = lazy{rel}
    expr = make_expression lazy_predicate, lazy_rel
    pred = make_predicate expr, lazy_rel
    rel = make_relation expr, pred
    return expr, pred, rel
  end