presto-ml/src/main/java/io/prestosql/plugin/ml/EvaluateClassifierPredictionsStateFactory.java/GroupedEvaluateClassifierPredictionsState/setGroupId
class GroupedEvaluateClassifierPredictionsState:        @Override
        public void setGroupId(long groupId)
        {
            this.groupId = groupId;
        }