Method addFunction

bolt/vector/FunctionVector.h:154–168

Implements evaluation of the lambda function literal special form. This assigns a function to a specified set of rows. This supports a situation of returning different lambdas from different cases of a conditional. FunctionVectors enforce single assignment. A lambda cannot be for example a loop variable.

  // different cases of a conditional. FunctionVectors enforce single
  // assignment. A lambda cannot be for example a loop variable.
  void addFunction(
      std::shared_ptr<Callable> callable,
      const SelectivityVector& rows) {
    for (auto& otherRows : rowSets_) {
      auto begin = std::max(rows.begin(), otherRows.begin());
      auto end = std::min(rows.end(), otherRows.end());
      BOLT_CHECK(
          !bits::hasIntersection(
              otherRows.asRange().bits(), rows.asRange().bits(), begin, end),
          "Functions in a FunctionVector may not have intersecting SelectivityVectors");
    }

    rowSets_.push_back(rows);
    functions_.push_back(callable);
  }

  bool containsNullAt(vector_size_t idx) const override {
    return false;