 loosen the  defintion of  trivial''-varibale, allow internal use of formulas for the fast dataset  creation
 loosen the  defintion of  trivial''-varibale, allow internal use of formulas for the fast dataset  creation

OstapHEP/ostap,OstapHEP/ostap,OstapHEP/ostap,OstapHEP/ostap