presto-main/src/main/java/io/prestosql/operator/aggregation/MergeQuantileDigestFunction.java/MergeQuantileDigestFunction/input
class MergeQuantileDigestFunction:    @InputFunction
    public static void input(Type type, QuantileDigestState state, Block value, int index)
    {
        merge(state, new QuantileDigest(type.getSlice(value, index)));
    }