${IF(pRESOURCE_TYPE = '现存已配车',"select calculation_method,car_series,car_model,sum(allocation_predict_qty) as qtyfrom dal.dal_dvmp_delivery_forecast_frwhere calculation_method in ('"+pd+"')"group by car_series,calculation_method,car_model ","select car_series,car_model,sum(allocation_predict_qty) as qtyfromdal.dal_dvmp_delivery_forecast_frgroup by car_series,car_model")},请问这个怎么嵌套参数为空选择全部例如${if(len(pMETHOD) == 0,"","and calculation_method IN ('" +pMETHOD + "')")}