message: Tweak Query_OptimalNode
diff: @@ -5434,6 +5434,7 @@ TEST(Query_OptimalNode)
  }
  auto q1 = table->where().equal(col_type, "todo0", false);
  + q1.count(); // Warm up
  auto t1 = steady_clock::now();
  auto cnt = q1.count();
  auto t2 = steady_clock::now();
  @@ -5442,6 +5443,7 @@ TEST(Query_OptimalNode)
  // std::cout << "cnt: " << cnt << " dur1: " << dur1 << " us" << std::endl;
  auto q2 = table->where().contains(col_tags, "tag0", false);
  + q2.count(); // Warm up
  t1 = steady_clock::now();
  cnt = q2.count();
  t2 = steady_clock::now();
  @@ -5450,6 +5452,7 @@ TEST(Query_OptimalNode)
  // std::cout << "cnt: " << cnt << " dur2: " << dur2 << " us" << std::endl;
  Query q = q1.and_query(q2);
  + q.count(); // Warm up
  t1 = steady_clock::now();
  cnt = q.count();
  t2 = steady_clock::now();
  