Method buildReplayLayout

app/src/CSV/Player.cpp:891–924

* @brief Builds the replay column layout from the export schema (uniqueId-ordered, virtual * datasets included) and installs the per-source FrameBuilder lookup map. */

 * datasets included) and installs the per-source FrameBuilder lookup map.
 */
void CSV::Player::buildReplayLayout()
{
  m_sourceColumnsByIndex.clear();

  DataModel::Frame frame;
  frame.groups       = DataModel::ProjectModel::instance().groups();
  frame.sources      = DataModel::ProjectModel::instance().sources();
  const auto schema  = DataModel::buildExportSchema(frame);
  const int colCount = static_cast<int>(schema.columns.size());

  QSet<int> sources;
  for (const auto& col : schema.columns)
    sources.insert(col.sourceId);

  m_multiSource = sources.size() > 1;

  std::unordered_map<int, std::unordered_map<int, int>> replay;

  if (!m_multiSource) {
    for (int i = 0; i < colCount; ++i)
      replay[0][schema.columns[static_cast<size_t>(i)].uniqueId] = i;
  }

  else {
    std::unordered_map<int, int> nextLocal;
    for (int i = 0; i < colCount; ++i) {
      const auto& col = schema.columns[static_cast<size_t>(i)];
      m_sourceColumnsByIndex[col.sourceId].append(i);
      replay[col.sourceId][col.uniqueId] = nextLocal[col.sourceId]++;
    }
  }

  DataModel::FrameBuilder::instance().setReplayColumnMap(std::move(replay));
}

/**
 * @brief Injects a CSV frame, splitting per source when in multi-source mode.