To use these functions, the Interval Feature is required.

The interval feature provides arbitrary functions to work with intervals in a data stream and algebraic operator (+, *, -, /, ^) to perform interval addition, subtraction, multiplication, division, and exponentiation.

 ```SELECT toInterval(1.0,5.0) + toInterval(-2.0,3.0) FROM stream => [-1.0,8.0] SELECT toInterval(1.0,5.0) - toInterval(-2.0,3.0) FROM stream => [-2.0,7.0] SELECT toInterval(1.0,5.0) * toInterval(-2.0,3.0) FROM stream => [-10.0,15.0] SELECT toInterval(1.0,5.0) / toInterval(-2.0,3.0) FROM stream => [-2.5,Infinity]```

### Union(Interval i1, Interval i2)

Computes the union of the two intervals.

 ```SELECT union(toInterval(1.0,5.0), toInterval(-2.0,3.0)) FROM stream => [-2.0,5.0]```

### Difference(Interval i1, Interval i2)

Computes the difference of the two intervals

 ```SELECT difference(toInterval(1.0,5.0), toInterval(-2.0,3.0)) FROM stream => [3.0,5.0]```

### Intersection(Interval i1, Interval i2)

Computes the intersection of the two intervals

 ```SELECT intersection(toInterval(1.0,5.0), toInterval(-2.0,3.0)) FROM stream => [1.0,3.0]```

### ToInterval(Number inf, Number sup)

Converts the given value to an interval value.