improve is_spawnable

Author: aalkin

Framework/Core/include/Framework/ASoA.h

@@ -390,8 +390,8 @@ concept is_metadata_trait = framework::specialization_of_template<aod::MetadataT
 template <typename T>
 concept has_metadata = is_metadata_trait<T> && not_void<typename T::metadata>;
 
-// template <typename T>
-// concept has_sources = is_metadata<T> && not_void<typename T::sources>;
+template <typename T>
+concept has_extension = is_metadata<T> && not_void<typename T::extension_table_t>;
 
 template <typename T>
 concept is_spawnable_column = std::same_as<typename T::spawnable_t, std::true_type>;

Framework/Core/include/Framework/AnalysisHelpers.h

@@ -229,7 +229,7 @@ struct TableTransform {
 /// This helper struct allows you to declare extended tables which should be
 /// created by the task (as opposed to those pre-defined by data model)
 template <typename T>
-concept is_spawnable = soa::is_table<T> && soa::has_metadata<aod::MetadataTrait<T>> && !soa::is_index_table<T>;
+concept is_spawnable = soa::has_metadata<aod::MetadataTrait<o2::aod::Hash<T::ref.desc_hash>>> && soa::has_extension<typename aod::MetadataTrait<o2::aod::Hash<T::ref.desc_hash>>::metadata>;
 
 template <is_spawnable T>
 constexpr auto transformBase()