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Add ipprefix cast operators for ipaddr [2/n] (#11481)
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Summary:

Support casting ipprefix -> ipaddress, and ipaddress -> ipprefix.

We just need one new helper function, tryIpPrefixLengthFromIPAddressType, which takes in int128_t, gets the ippaddress, and then we check if the ippaddress is ipv4 or ipv6 mapped. We return 32 for ipv4 and 128 for ipv6 mapped.

Also applies suggestion from https://github.com/facebookincubator/velox/pull/11309/files

Differential Revision: D65641994
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@yuandagits @facebook-github-bot
yuandagits authored and facebook-github-bot committed Nov 12, 2024
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