Function addFields

bolt/core/PlanNode.cpp:229–236

          source,
          isSortBased) {}

namespace {
void addFields(
    std::stringstream& stream,
    const std::vector<FieldAccessTypedExprPtr>& keys) {
  for (auto i = 0; i < keys.size(); ++i) {
    appendComma(i, stream);
    stream << keys[i]->name();
  }
}