def to_projection(self):
        """
        Promote this column expression to a table projection
        """
        roots = self._root_tables()
        if 1 > len(roots):
            raise RelationError('Cannot convert array expression involving '
                                'multiple base table references to a '
                                'projection')

        table = TableExpr(roots[0])
        return table.projection([self])
dataset/ETHPy150Open cloudera/ibis/ibis/expr/types.py/ArrayExpr.to_projection/swapped operands of `>`