# IP Address函数
contains(network, address) → boolean
当CIDR网络中包含address时返回true。
示例：
- 返回true：
  ```
  SELECT contains('10.0.0.0/8', IPADDRESS '10.255.255.255'); 
  SELECT contains('2001:0db8:0:0:0:ff00:0042:8329/128', IPADDRESS '2001:0db8:0:0:0:ff00:0042:8329');
  ```
  

- 返回false：
  ```
  SELECT contains('10.0.0.0/8', IPADDRESS '11.255.255.255');  
  SELECT contains('2001:0db8:0:0:0:ff00:0042:8329/128', IPADDRESS '2001:0db8:0:0:0:ff00:0042:8328');
  ```