Method DoImport

cpp/src/arrow/c/bridge.cc:1036–1084

  }

  Status DoImport() {
    // First import children (required for reconstituting parent type)
    child_importers_.resize(c_struct_->n_children);
    for (int64_t i = 0; i < c_struct_->n_children; ++i) {
      DCHECK_NE(c_struct_->children[i], nullptr);
      RETURN_NOT_OK(child_importers_[i].ImportChild(this, c_struct_->children[i]));
    }

    // Import main type
    RETURN_NOT_OK(ProcessFormat());
    DCHECK_NE(type_, nullptr);

    // Import dictionary type
    if (c_struct_->dictionary != nullptr) {
      // Check this index type
      if (!is_integer(type_->id())) {
        return Status::Invalid(
            "ArrowSchema struct has a dictionary but is not an integer type: ",
            type_->ToString());
      }
      SchemaImporter dict_importer;
      RETURN_NOT_OK(dict_importer.ImportDict(this, c_struct_->dictionary));
      bool ordered = (c_struct_->flags & ARROW_FLAG_DICTIONARY_ORDERED) != 0;
      type_ = dictionary(type_, dict_importer.type_, ordered);
    }

    // Import metadata
    ARROW_ASSIGN_OR_RAISE(metadata_, DecodeMetadata(c_struct_->metadata));

    // Detect extension type
    if (!metadata_.extension_name.empty()) {
      const auto registered_ext_type = GetExtensionType(metadata_.extension_name);
      if (registered_ext_type) {
        ARROW_ASSIGN_OR_RAISE(
            type_, registered_ext_type->Deserialize(std::move(type_),
                                                    metadata_.extension_serialized));
        // If metadata is present, delete both metadata keys (otherwise, just remove
        // the extension name key)
        if (metadata_.extension_serialized_index >= 0) {
          RETURN_NOT_OK(metadata_.metadata->DeleteMany(
              {metadata_.extension_name_index, metadata_.extension_serialized_index}));
        } else {
          RETURN_NOT_OK(metadata_.metadata->Delete(metadata_.extension_name_index));
        }
      }
    }

    return Status::OK();
  }

  Status ProcessFormat() {
    f_parser_ = FormatStringParser(c_struct_->format);