message: Add unordered_map to symbols
diff: @@ -191,8 +191,13 @@ template class std::bitset<STORAGE_CHUNK_SIZE>;
  template class std::unordered_map<PhysicalOperator *, QueryProfiler::TreeNode *>;
  template class std::stack<PhysicalOperator *>;
  -// template class std::unordered_map<string,
  -// std::unique_ptr<CatalogEntry>>;
  +#define INSTANTIATE_UNORDERED_MAP(MAP_DEFINITION) \
  + template MAP_DEFINITION::mapped_type& MAP_DEFINITION::operator[](MAP_DEFINITION::key_type&& k); \
  + template MAP_DEFINITION::mapped_type& MAP_DEFINITION::operator[](const MAP_DEFINITION::key_type& k);
  +
  +using catalog_map = std::unordered_map<string,unique_ptr<CatalogEntry>>;
  +INSTANTIATE_UNORDERED_MAP(catalog_map);
  +
  template class std::unordered_map<string, uint64_t>;
  template class std::unordered_map<string, std::vector<string>>;
  template class std::unordered_map<string, std::pair<uint64_t, Expression *>>;
  