y/iterator.go
func (s *MergeIterator) Seek(key []byte) {
	for _, itr := range s.all {
		itr.Seek(key)
	}
	s.initHeap()
}
func (s *MergeIterator) Seek(key []byte) {
	for _, itr := range s.all {
		itr.Seek(key)
	}
	s.initHeap()
}
func ( s * MergeIterator ) Seek ( key [ ] byte ) { for _ , itr := range s . all { itr . Seek ( key ) } s . initHeap ( ) }
// Seek brings us to element with key >= given key.
Seek brings us to element with key > = given key .