_costEst.setInputParams(opComp);
// we can use the same firstAgg, because we no tupleSchema change
// occurred after LAST_COMPONENT:FinalAgg and NEW_COMPONENT:FinalAgg
// Namely, NEW_COMPONENT has only FinalAgg operator
opComp.addOperator(firstAgg);
if (_costEst != null)
_costEst.setOutputParamsAndPar(opComp);
}