presto-spi/src/main/java/io/prestosql/spi/predicate/Range.java/Range/span
class Range:    public Range span(Range other)
    {
        checkTypeCompatibility(other);
        Marker lowMarker = Marker.min(low, other.getLow());
        Marker highMarker = Marker.max(high, other.getHigh());
        return new Range(lowMarker, highMarker);
    }