core/maxframe/dataframe/arithmetic/core.py [106:119]:
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            if x1.index_value is not None and x2.index_value is not None:
                if x1.index_value.key == x2.index_value.key:
                    index = copy.copy(x1.index_value)
                    index_shape = x1.shape[0]
                else:
                    index = infer_index_value(
                        x1.index_value, x2.index_value, level=level
                    )
                    if index.key == x1.index_value.key == x2.index_value.key and (
                        not np.isnan(x1.shape[0]) or not np.isnan(x2.shape[0])
                    ):
                        index_shape = (
                            x1.shape[0] if not np.isnan(x1.shape[0]) else x2.shape[0]
                        )
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core/maxframe/dataframe/arithmetic/core.py [191:204]:
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            if x1.index_value is not None and x2.index_value is not None:
                if x1.index_value.key == x2.index_value.key:
                    index = copy.copy(x1.index_value)
                    index_shape = x1.shape[0]
                else:
                    index = infer_index_value(
                        x1.index_value, x2.index_value, level=level
                    )
                    if index.key == x1.index_value.key == x2.index_value.key and (
                        not np.isnan(x1.shape[0]) or not np.isnan(x2.shape[0])
                    ):
                        index_shape = (
                            x1.shape[0] if not np.isnan(x1.shape[0]) else x2.shape[0]
                        )
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