Function hashes

cpp/src/arrow/compute/key_map_internal.h:85–87

  void num_inserted(uint32_t i) { num_inserted_ = i; }

  uint32_t* hashes() const {
    return reinterpret_cast<uint32_t*>(hashes_->mutable_data());
  }

  /// \brief Extract group id for a given slot in a given block using aligned 32-bit read
  /// regardless of the number of group id bits.