212       mutable_iter_(nullptr),  in ForwardIterator()
292   if (mutable_iter_ != nullptr) {  in Cleanup()
293     DeleteIterator(mutable_iter_, true /* is_arena */);  in Cleanup()
352   assert(mutable_iter_);  in SeekInternal()
354   seek_to_first ? mutable_iter_->SeekToFirst() :  in SeekInternal()
355                   mutable_iter_->Seek(internal_key);  in SeekInternal()
375       seek_to_first ? mutable_iter_->SeekToFirst()  in SeekInternal()
376                     : mutable_iter_->Seek(internal_key);  in SeekInternal()
475   } else if (current_ && current_ != mutable_iter_) {  in SeekInternal()
502   } else if (current_ != mutable_iter_) {  in Next()
523   if (current_ != mutable_iter_) {  in Next()
535         mutable_iter_->Seek(prev_key_.GetInternalKey());  in Next()
556   } else if (!mutable_iter_->status().ok()) {  in status()
557     return mutable_iter_->status();  in status()
580   if (mutable_iter_) {  in UpdateChildrenPinnedItersMgr()
581     mutable_iter_->SetPinnedItersMgr(pinned_iters_mgr_);  in UpdateChildrenPinnedItersMgr()
625   mutable_iter_ = sv_->mem->NewIterator(read_options_, &arena_);  in RebuildIterators()
677   if (mutable_iter_ != nullptr) {  in RenewIterators()
678     DeleteIterator(mutable_iter_, true /* is_arena */);  in RenewIterators()
685   mutable_iter_ = svnew->mem->NewIterator(read_options_, &arena_);  in RenewIterators()
814   if (immutable_min_heap_.empty() && !mutable_iter_->Valid()) {  in UpdateCurrent()
817     current_ = mutable_iter_;  in UpdateCurrent()
818   } else if (!mutable_iter_->Valid()) {  in UpdateCurrent()
826         mutable_iter_->key(), current_->key());  in UpdateCurrent()
831       current_ = mutable_iter_;  in UpdateCurrent()
868   if (immutable_min_heap_.empty() && current_ == mutable_iter_) {  in NeedToSeekImmutable()
873         target, current_ == mutable_iter_ ? immutable_min_heap_.top()->key()  in NeedToSeekImmutable()