presto-main/src/main/java/io/prestosql/operator/scalar/QuarterOfYearDateTimeField.java/QuarterOfYearDurationFieldType/getField
class QuarterOfYearDurationFieldType:        @Override
        public DurationField getField(Chronology chronology)
        {
            return new ScaledDurationField(chronology.months(), QUARTER_OF_YEAR_DURATION_FIELD_TYPE, 3);
        }