Method find_operator

schema.hh:69–76

    aggregates.push_back(r);
  }
  virtual op_iterator find_operator(sqltype *left, sqltype *right, sqltype *res) {
    typekey t(left, right, res);
    auto cons = index.equal_range(t);
    if (cons.first == cons.second)
      return index.end();
    else
      return random_pick<>(cons.first, cons.second);
  }
  schema() { }
  void generate_indexes();
};