Method GetProperty

src/leveldb/db/db_test.cc:2076–2078

  }

  bool GetProperty(const Slice& property, std::string* value) override {
    return false;
  }
  void GetApproximateSizes(const Range* r, int n, uint64_t* sizes) override {
    for (int i = 0; i < n; i++) {
      sizes[i] = 0;