Redis HyperLogLog Pfcount 命令

redis 127.0.0.1:6379> PFCOUNT KEY1 KEY@... KEYN

redis 127.0.0.1:6379> PFADD mykey a b c d e f g h i j 
(integer) 1 
redis 127.0.0.1:6379> PFCOUNT mykey 
(integer) 10 
redis 127.0.0.1:6379> PFCOUNT mykey 
(integer) 10 
redis 127.0.0.1:6379> PFCOUNT mykey mynewkey 
(integer) 10