Method MergeUnchecked

pkg/segment/set.go:706–718

MergeUnchecked attempts to merge two neighboring segments. If successful, MergeUnchecked returns an iterator to the merged segment, and all existing iterators are invalidated. Otherwise, MergeUnchecked returns a terminal iterator. Precondition: first is the predecessor of second: first.NextSegment(

(first, second Iterator)

// Precondition: first is the predecessor of second: first.NextSegment() ==
// second, first == second.PrevSegment().
func (s *Set) MergeUnchecked(first, second Iterator) Iterator {
	if first.End() == second.Start() {
		if mval, ok := (Functions{}).Merge(first.Range(), first.Value(), second.Range(), second.Value()); ok {
			// N.B. This must be unchecked because until s.Remove(second), first
			// overlaps second.
			first.SetEndUnchecked(second.End())
			first.SetValue(mval)
			// Remove will handle the maxGap update if necessary.
			return s.Remove(second).PrevSegment()
		}
	}
	return Iterator{}
}

// MergePrev attempts to merge the given segment with its predecessor if
// possible, and returns an updated iterator to the extended segment. All