def _merge_expressions(self, other):
        new_inputs = tuple(set(self.inputs).union(other.inputs))
        new_self_expr = self._rebind_variables(new_inputs)
        new_other_expr = other._rebind_variables(new_inputs)
        return new_self_expr, new_other_expr, new_inputs
Merge the inputs of two NumericalExpressions into a single input tuple,
dataset/ETHPy150Open quantopian/zipline/zipline/pipeline/expression.py/NumericalExpression._merge_expressions