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