code: func (pdb *BrokerCassa) Delete(fromWhere sql.Expression) error {
  	statement, bindings, err := ExpToString(fromWhere)
  	if err != nil {
  		return err
  	}
  	return pdb.session.Exec("DELETE"+statement, bindings...)
  }
docs: // Delete - see the description in interface sql.Broker.ExecPut()
  // Delete generates statement & binding for gocql Exec()