presto-ml/src/main/java/io/prestosql/plugin/ml/EvaluateClassifierPredictionsStateFactory.java/EvaluateClassifierPredictionsStateFactory/getSingleStateClass
class EvaluateClassifierPredictionsStateFactory:    @Override
    public Class<? extends EvaluateClassifierPredictionsState> getSingleStateClass()
    {
        return SingleEvaluateClassifierPredictionsState.class;
    }