Returns
        -------
        adjustments : list[dict[int -> Adjustment]]
            A list, where each element corresponds to the `columns`, of
            mappings from index to adjustment objects to apply at that index.

def load_pricing_adjustments(self, columns, dts, assets):
        """
        Returns
        -------
        adjustments : list[dict[int -> Adjustment]]
            A list, where each element corresponds to the `columns`, of
            mappings from index to adjustment objects to apply at that index.
        """
        out = [None] * len(columns)
        for i, column in enumerate(columns):
            adjs = {}
            for asset in assets:
                adjs.update(self._get_adjustments_in_range(
                    asset, dts, column))
            out[i] = adjs
        return out