Class NestedExtensionIdRegistryProvider

cpp/src/arrow/engine/substrait/ext_test.cc:65–69

};

struct NestedExtensionIdRegistryProvider : public ExtensionIdRegistryProvider {
  virtual ~NestedExtensionIdRegistryProvider() {}
  std::shared_ptr<ExtensionIdRegistry> registry_ = MakeExtensionIdRegistry();
  ExtensionIdRegistry* get() const override { return &*registry_; }
};

bool operator==(const Id& id1, const Id& id2) {
  return id1.uri == id2.uri && id1.name == id2.name;