• Массивы, кортежи, лямбда функции • Комбинаторы агрегатных функций • LIMIT BY, ASOF JOIN, ANY/SEMI JOIN, argMin/argMax Функции для предметной области из коробки: • Click-stream: функции обработки оптимизаций JOIN 18 • Не учитывается сортировка таблицы для JOIN • Нет cost based optimizer для переупорядочивания JOIN • Нет grace hash алгоритма для JOIN • Нет shuffle для распределённых JOIN • И вообще вообще распределённые JOIN плохо работают Отсутствие UPSERT 19 • Отсутствие точечных UPDATE и DELETE, а также UNIQUE KEY CONSTRAINT • Реализовать unique key в распределённой системе — нетривиальная

val{0}, y{0}; y < 29;) { if (atom.compare_exchange_weak(val, val + 1)) { ++y; }}}}; t1.join(); t2.join(); } cout << i << endl; // ordinary read, 1729 }21 span22 span Encapsulates Ptr-Len Pairs Code Reviews (primary dashboard!) • Work In Progress  Initial Review  Final Review  Ready To Merge  Done • GitHub Migration • C++20 Features • Available  Investigating  Reviewing PR  Done • commit history between releases • Old process: Record commits, write them up later • New process: Merge PR, add Changelog entry immediately • Advice for Reviewing Pull Requests • MSVC STL Contributors

他的确及时地和我交互了。但是用户交互 所在的主线程退出后，文件下载所在的子 线程，因为从属于这个主线程，也被迫退 出了。 主线程等待子线程结束： t1.join() • 因此，我们想要让主线程不要急着退出， 等子线程也结束了再退出。 • 可以用 std::thread 类的成员函数 join() 来等待该进程结束。 std::thread 的解构函数会销毁线程 • 作为一个 C++ 类， std::thread 这样就可以等下载完再退出了。 main 函数退出后自动 join 全部线程 • 但是需要在 main 里面手动 join 全部线 程还是有点麻烦，我们可以自定义一个类 ThreadPool ，并用他创建一个全局变量， 其解构函数会在 main 退出后自动调用。 std::jthread ：符合 RAII 思想，解构时自动 join() • C++20 引入了 std::jthread std::jthread 类，和 std::thread 不同在于：他的解构函数里会 自动调用 join() 函数，从而保证 pool 解 构时会自动等待全部线程执行完毕。 小彭老师快乐吐槽时间 • 多线程、异步、无阻塞、并发，能提升程序响应速度，对现实世界中的软件工程至关重要 。 • 反面教材： blender 在运行物理解算的时候，界面会卡住，算完一帧后窗口才能刷新一遍 ，导致解算过程中基本别想做事，这一定程度上归功于

Cancellation 生产实践 – Cancellation try_join_all!(a,b,c…) https://docs.rs/futures/latest/futures/future/fn.try_join_all.html 生产实践 – Cancellation try_join_all!(a,b,c…) join_all!(a,b,c…) https://github.com

 Supports cooperative cancellation  Destructor automatically  Asks thread to cancel  Calls join()38 Joining & Cancellable Threads  Cancelling threads  std::stop_token  Supports actively checking . */ } }; try { // ... Do something else ... } catch (...) { job.join(); throw; // rethrow } job.join(); } void DoWork() { std::jthread job { [] { /* ... */ } }; // ... Do something something else ... } // jthread destructor automatically cancels thread and calls join()40 Joining & Cancellable Threads  Example cooperative cancellation: std::jthread job { [](std::stop_token token)

Experts ? Slack channel stats ? Join us! http://tinyurl.com/nativeScriptSlack Slack channel standouts ? 1,900+ members! With Top Contributors: Join us! http://tinyurl.com/nativeScriptSlack Edwards (15) - 8) ? Osei Fortune (22) - 7) ? Peter Staev (32) - 6) ? Nikolay Tsonev (42) Join us! http://stackoverflow.com/tags/nativescript/ - 5) ? Todd Anglin (52) - 4) ? Brad Martin (61)

Path-Sensitive Static Analysis Gábor Horváth Gabor.Horvath@microsoft.com @XazaxHunWelcome to CppCon 2021! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ • Making intent explicit can help analysis, improve readabilityEnjoy the rest of the conference! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++

(they/them) @TartanLlama C++ Product Team, Microsoft @VisualC https://aka.ms/cpp Welcome to CppCon 2021! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team experience for Visual Studio Code CppCon 2021 Happy Coding! Thank you Enjoy the rest of the conference! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team

Not-soo-HAR-uh") Miya.Natsuhara@microsoft.com Software Engineer, Visual C++ LibrariesWelcome to CppCon 2021! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ complicated than you ever could have imagined :)53 Questions?Enjoy the rest of the conference! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++

Library  views::join_with(): Joins elements of a range using a given separator  E.g.: std::vector v { "Hello", "World", "!" }; for (auto c : v | std::views::join_with('\n')) { std::print("{}"