presto-ml/src/main/java/io/prestosql/plugin/ml/LearnRegressorAggregation.java/LearnRegressorAggregation/output
class LearnRegressorAggregation:    @OutputFunction(RegressorType.NAME)
    public static void output(@AggregationState LearnState state, BlockBuilder out)
    {
        LearnLibSvmRegressorAggregation.output(state, out);
    }