message: Fix(Database): fix bug of removing duplicates when unnecessary
diff: @@ -686,12 +686,12 @@ Strategy::handler2(BasicQuery* _bq, vector<unsigned*>& _result_list)
  if (var1_id == 0) //subject var selected
  {
  //use p2s directly
  - this->kvstore->getsubIDlistBypreID(pre_id, id_list, id_list_len, true, txn);
  + this->kvstore->getsubIDlistBypreID(pre_id, id_list, id_list_len, false, txn);
  }
  else if (var2_id == 0) //object var selcted
  {
  //use p2o directly
  - this->kvstore->getobjIDlistBypreID(pre_id, id_list, id_list_len, true, txn);
  + this->kvstore->getobjIDlistBypreID(pre_id, id_list, id_list_len, false, txn);
  }
  else
  {
  