presto-main/src/main/java/io/prestosql/type/DateTimeOperators.java/DateTimeOperators/timestampPlusIntervalYearToMonth
class DateTimeOperators:    @ScalarOperator(ADD)
    @SqlType(StandardTypes.TIMESTAMP)
    public static long timestampPlusIntervalYearToMonth(ConnectorSession session, @SqlType(StandardTypes.TIMESTAMP) long left, @SqlType(StandardTypes.INTERVAL_YEAR_TO_MONTH) long right)
    {
        if (session.isLegacyTimestamp()) {
            return getChronology(session.getTimeZoneKey()).monthOfYear().add(left, right);
        }
        return MONTH_OF_YEAR_UTC.add(left, right);
    }