docs: private void scheduleBatchLoadIfNeeded(Serializable id, SharedSessionContractImplementor session) throws MappingException {
  		//cannot batch fetch by unique key (property-ref associations)
  		if ( StringHelper.isEmpty( delegate.getRHSUniqueKeyPropertyName() ) && id != null ) {
  			EntityPersister persister = session.getFactory().getMetamodel().entityPersister( delegate.getAssociatedEntityName() );
  			EntityKey entityKey = session.generateEntityKey( id, persister );
  			if ( !session.getPersistenceContext().containsEntity( entityKey ) ) {
  				session.getPersistenceContext().getBatchFetchQueue().addBatchLoadableEntityKey( entityKey );
  			}
  		}
  	}