presto-main/src/main/java/io/prestosql/type/IntervalYearMonthOperators.java/IntervalYearMonthOperators/doubleMultiply
class IntervalYearMonthOperators:    @ScalarOperator(MULTIPLY)
    @SqlType(StandardTypes.INTERVAL_YEAR_TO_MONTH)
    public static long doubleMultiply(@SqlType(StandardTypes.DOUBLE) double left, @SqlType(StandardTypes.INTERVAL_YEAR_TO_MONTH) long right)
    {
        return (long) (left * right);
    }