presto-redis/src/main/java/io/prestosql/plugin/redis/RedisTableFieldGroup.java/RedisTableFieldGroup/toString
class RedisTableFieldGroup:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("dataFormat", dataFormat)
                .add("name", name)
                .add("fields", fields)
                .toString();
    }