[docs]@result_to_dataframe(["queries"])defpure(self,previous_result:pd.DataFrame,*args,**kwargs):""" Do not perform query expansion. Return with the same queries. The dimension will be 2-d list, and the column name will be 'queries'. """assert("query"inprevious_result.columns),"previous_result must have query column."queries=previous_result["query"].tolist()returnlist(map(lambdax:[x],queries))