Method size

cpp/src/arrow/util/hashing.h:487–489

The number of entries in the memo table +1 if null was added. (which is also 1 + the largest memo index)

  // The number of entries in the memo table +1 if null was added.
  // (which is also 1 + the largest memo index)
  int32_t size() const override {
    return static_cast<int32_t>(hash_table_.size()) + (GetNull() != kKeyNotFound);
  }

  // Copy values starting from index `start` into `out_data`
  template <typename Value>