presto-main/src/main/java/io/prestosql/operator/aggregation/ParametricAggregation.java/ParametricAggregation/signaturesFromTypes
class ParametricAggregation:    private static List<TypeSignature> signaturesFromTypes(List<Type> types)
    {
        return types
                .stream()
                .map(Type::getTypeSignature)
                .collect(toImmutableList());
    }