message: to speed up the query for (distinct) predicate
diff: @@ -132,7 +132,10 @@ bool GeneralEvaluation::doQuery()
  }
  this->strategy = Strategy(this->kvstore, this->vstree, this->pre2num,this->pre2sub, this->pre2obj,
  - this->limitID_predicate, this->limitID_literal, this->limitID_entity);
  + this->limitID_predicate, this->limitID_literal, this->limitID_entity,
  + this->query_tree.Modifier_Distinct== QueryTree::Modifier_Distinct);
  +
  +
  if (this->query_tree.checkWellDesigned())
  {
  printf("=================\n");
  