message: feat(Query): expand max query var num
diff: @@ -175,7 +175,8 @@ private:
  map<int, int> selected_var_position;
  public:
  - static const int MAX_VAR_NUM = 20;
  + // static const int MAX_VAR_NUM = 20;
  + static const int MAX_VAR_NUM = 50;
  static const int MAX_PRE_VAR_NUM = 20;
  static const char NOT_JUST_SELECT = 'a';
  static const char SELECT_VAR = 's';
  