presto-ml/src/main/java/io/prestosql/plugin/ml/LearnClassifierAggregation.java/LearnClassifierAggregation/input
class LearnClassifierAggregation:    @InputFunction
    public static void input(
            @AggregationState LearnState state,
            @SqlType(BIGINT) long label,
            @SqlType("map(bigint,double)") Block features)
    {
        input(state, (double) label, features);
    }