Method ReadDescriptors

src/colmap/scene/database_sqlite.cc:841–859

  }

  FeatureDescriptors ReadDescriptors(const image_t image_id) const override {
    Sqlite3StmtContext context(sql_stmt_read_descriptors_);

    SQLITE3_CALL(sqlite3_bind_int64(sql_stmt_read_descriptors_, 1, image_id));

    const int rc = SQLITE3_CALL(sqlite3_step(sql_stmt_read_descriptors_));
    FeatureDescriptors descriptors;
    descriptors.data = ReadDynamicMatrixBlob<FeatureDescriptorsData>(
        sql_stmt_read_descriptors_, rc, 0);

    // Read feature type from column 3 (0-indexed after rows, cols, data).
    if (rc == SQLITE_ROW &&
        sqlite3_column_type(sql_stmt_read_descriptors_, 3) != SQLITE_NULL) {
      descriptors.type = static_cast<FeatureExtractorType>(
          sqlite3_column_int(sql_stmt_read_descriptors_, 3));
    }

    return descriptors;
  }

  FeatureMatchesBlob ReadMatchesBlob(image_t image_id1,
                                     image_t image_id2) const override {