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IP Address Functions

`contains(network, address) -> boolean`

Returns true if the address exists in the CIDR network:

SELECT contains('10.0.0.0/8', IPADDRESS '10.255.255.255'); -- true
SELECT contains('10.0.0.0/8', IPADDRESS '11.255.255.255'); -- false

SELECT contains('2001:0db8:0:0:0:ff00:0042:8329/128', IPADDRESS '2001:0db8:0:0:0:ff00:0042:8329'); -- true
SELECT contains('2001:0db8:0:0:0:ff00:0042:8329/128', IPADDRESS '2001:0db8:0:0:0:ff00:0042:8328'); -- false