code: def select(self, node):
          
  
          child_object = self.translate(node.child)
          where_block = node.conditions
          if child_object.where_block:
                where_block = '({0}) AND ({1})'\
                    .format(child_object.where_block, node.conditions)
          child_object.where_block = where_block
          if not child_object.select_block:
              child_object.select_block = str(node.attributes)
          return child_object
docs: Translate a select node into SQLQuery.
          :param node: a treebrd node
          :return: a SQLQuery object for the tree rooted at node