presto-ml/src/main/java/io/prestosql/plugin/ml/EvaluateClassifierPredictionsStateFactory.java/GroupedEvaluateClassifierPredictionsState/addMemoryUsage
class GroupedEvaluateClassifierPredictionsState:        @Override
        public void addMemoryUsage(int memory)
        {
            memoryUsage += memory;
        }