presto-main/src/main/java/io/prestosql/operator/scalar/SequenceFunction.java/SequenceFunction/sequenceDefaultStep
class SequenceFunction:    @ScalarFunction("sequence")
    @SqlType("array(bigint)")
    public static Block sequenceDefaultStep(
            @SqlType(StandardTypes.BIGINT) long start,
            @SqlType(StandardTypes.BIGINT) long stop)
    {
        return fixedWidthSequence(start, stop, stop >= start ? 1 : -1, BIGINT);
    }