presto-main/src/main/java/io/prestosql/type/TimestampWithTimeZoneOperators.java/TimestampWithTimeZoneOperators/hashCode
class TimestampWithTimeZoneOperators:    @ScalarOperator(HASH_CODE)
    @SqlType(StandardTypes.BIGINT)
    public static long hashCode(@SqlType(StandardTypes.TIMESTAMP_WITH_TIME_ZONE) long value)
    {
        return AbstractLongType.hash(unpackMillisUtc(value));
    }