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.
{
public:
    explicit FunctionAnyHash(ContextPtr context) : selector(context)
    {
        selector.registerImplementation<TargetArch::Default,
            TargetSpecific::Default::FunctionAnyHash<Impl>>();
    #if USE_MULTITARGET_CODE
        selector.registerImplementation<TargetArch::AVX2,
            TargetSpecific::AVX2::FunctionAnyHash<Impl>>();
        selector.registerImplementation<TargetArch::AVX512F,
            TargetSpecific::AVX512F::FunctionAnyHash<Impl>>();
    #endif
    }
    ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
    {
        return selector.selectAndExecute(arguments, result_type, input_rows_count);
    }
    static FunctionPtr create(ContextPtr context)
    {
        return std::make_shared<FunctionAnyHash>(context);
    }
private:
    ImplementationSelector<IFunction> selector;
};
struct URLHashImpl
{
    static UInt64 apply(const char * data, const size_t size)