https://github.com/ClickHouse/ClickHouse/blob/9a48cf0da8badfc5f3da08611eb44961aa28e3f6/src/Functions/FunctionsHashing.h#L669-L671

There's a call to `blake3_free_char_pointer` that passes ownership of the pointer back to Rust (which then frees the memory), then there's a call to `std::string`'s constructor that accepts that now-freed pointer.
{
        return combineHashesFunc<UInt128, SipHash128Impl>(h1, h2);
    }
    static UInt128 apply(const char * data, const size_t size)
    {
        return sipHash128(data, size);
    }
    static constexpr bool use_int_hash_for_pods = false;
};
/** Why we need MurmurHash2?
  * MurmurHash2 is an outdated hash function, superseded by MurmurHash3 and subsequently by CityHash, xxHash, HighwayHash.
  * Usually there is no reason to use MurmurHash.
  * It is needed for the cases when you already have MurmurHash in some applications and you want to reproduce it
  * in ClickHouse as is. For example, it is needed to reproduce the behaviour
  * for NGINX a/b testing module: https://nginx.ru/en/docs/http/ngx_http_split_clients_module.html
  */
struct MurmurHash2Impl32
{
    static constexpr auto name = "murmurHash2_32";
    using ReturnType = UInt32;
    static UInt32 apply(const char * data, const size_t size)