presto-ml/src/main/java/io/prestosql/plugin/ml/EvaluateClassifierPredictionsStateFactory.java/SingleEvaluateClassifierPredictionsState/getEstimatedSize
class SingleEvaluateClassifierPredictionsState:        @Override
        public long getEstimatedSize()
        {
            return memoryUsage + 3 * HASH_MAP_SIZE;
        }