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