def _merged_column_names_from(self, dataset_list):
        elements = []
        for idx_dataset, dataset in enumerate(dataset_list):
            # require getting the code from the dataset object always
            code = self.__dataset_objects__()[idx_dataset].code
            for index, column_name in enumerate(dataset.column_names):
                # only include column names that are not filtered out
                # by specification of the column_indexes list
                if self._include_column(dataset, index):
                    # first index is the date, don't modify the date name
                    if index != 0:
                        elements.append(self._rename_columns(code, column_name))
                    else:
                        elements.append(column_name)
        return list(unique_everseen(elements))
dataset/ETHPy150Open quandl/quandl-python/quandl/model/merged_dataset.py/MergedDataset._merged_column_names_from/operator `>` -> `!=`