Function to_string

src/backend/common/half.hpp:1158–1160

std::ostream& operator<<(std::ostream& os, const half& val);

static inline std::string to_string(const half& val) {
    return std::to_string(static_cast<float>(val));
}

static inline std::string to_string(const half&& val) {
    return std::to_string(static_cast<float>(val));