presto-main/src/main/java/io/prestosql/type/RealOperators.java/RealOperators/xxHash64
class RealOperators:    @ScalarOperator(XX_HASH_64)
    @SqlType(StandardTypes.BIGINT)
    public static long xxHash64(@SqlType(StandardTypes.REAL) long value)
    {
        return XxHash64.hash(floatToIntBits(intBitsToFloat((int) value)));
    }