84    for (iter.Seek(dummy_slice, k.memtable_key().data());  in Get()
129     void Seek(const Slice& user_key, const char* memtable_key) override {  in Seek()  argument
130       if (memtable_key != nullptr) {  in Seek()
131         iter_.Seek(memtable_key);  in Seek()
138     void SeekForPrev(const Slice& user_key, const char* memtable_key) override {  in SeekForPrev()  argument
139       if (memtable_key != nullptr) {  in SeekForPrev()
140         iter_.SeekForPrev(memtable_key);  in SeekForPrev()
207     void Seek(const Slice& internal_key, const char* memtable_key) override {  in Seek()  argument
209         (memtable_key != nullptr) ?  in Seek()
210             memtable_key : EncodeKey(&tmp_, internal_key);  in Seek()
231                      const char* memtable_key) override {  in SeekForPrev()  argument
232       const char* encoded_key = (memtable_key != nullptr)  in SeekForPrev()
233                                     ? memtable_key  in SeekForPrev()