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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def select(self, *columns):
 """ Set the columns to be selected :param columns: The columns to be selected :type columns: tuple :return: The current QueryBuilder instance :rtype: QueryBuilder """

        if not columns:
            columns = ["*"]

        self.columns = list(columns)

        return self