根据文档,设置join_algorithm='auto' 以启用自动切换JOIN算法的模式,ClickHouse先尝试用hash join算法,然后在内存超过阈值的情况下切换到partial merge join算法。阈值有两个:max_bytes_in_join和max_rows_in_join,指定hash join算法创建的hash table的最大的占用内存字节数
void std::__function::__policy_invoker<void ()>::__call_impl<std::__function::__default_alloc_func<DB::PipelineExecutor::spawnThreads()::$_0, void ()>>(std::__function::__policy_storage const*) @ 0x000000001280965b in /home/ubuntu/depot/ch-pro/build-release/programs/clickhouse 19...
例如: ```cpp #include <iostream> #include <thread> class Printer { public: void print(const std::string& msg) { std::cout << msg << std::endl; } }; int main() { Printer printer; std::thread t(&Printer::print, &printer, "Hello from member function!"); if (t.joinable()) ...
prog.cc:In function'int main()': prog.cc:13:30:error:no matchfor'operator|'(operand types are'const std::string [2]'{aka'const std::__cxx11::basic_string<char> [2]'}and'std::ranges::views::__adaptor::_Partial<std::ranges::views::_JoinWith, const char*>')13| const string...
Function Approximation Entry Point Device Support Supported Types Template Parameters Access Functions Ports Design Notes Input Data Configuring the Lookup Table Input Domain Modes Lookup Utility Functions Code Example Hadamard Product Entry Point Device Support Supported Types Template...
\n";// checking if it isjoinableif(t1.joinable())cout<<"YES\n";elsecout<<"NO\n";// calling the function threadFunc// to put thread to sleept1 =std::thread(threadFunc);cout<<"t1joinablewhen put to sleep? \n";// checking if t1 isjoinableif(t1.joinable())cout<<"YES\n";...
第二类是无结果输出的查询,可以在源代码ParserQuery.cpp中看到:InsertQuery、UseQuery、SetQuery、SystemQuery、CreateUserQuery、CreateRoleQuery、CreateQuotaQuery、CreateRowPolicyQuery、CreateSettingsProfileQuery、CreateFunctionQuery、DropFunctionQuery、DropAccessEntityQuery、GrantQuery、SetRoleQuery、ExternalDDLQuery、Back...
#11 0x0000000000401313 in std::vector<int, std::allocator<int> >::at (this=0x7f35b2851e60, __n=1) at /usr/include/c++/4.8.2/bits/stl_vector.h:812 #12 0x0000000000400fde in thread_func at demo.cpp:9 #13 0x000000000040262f in std::_Bind_simple<void (*)>::_M_invoke<>(std::...
cpp std::mutex mtx; void threadFunction() { std::lock_guard<std::mutex> lock(mtx); // 访问共享资源的代码 } 错误的对象生命周期管理: 原因:如果std::thread对象在创建后立即超出作用域,而线程函数尚未执行完毕,也可能导致崩溃。 解决方法:确保std::thread对象的生命周期覆盖整个线程执行周期。
A handy function that works with such iterables is thejoin()function. This function can combine the elements of an iterable into a single string, and we can specify the separator of the elements in the string with the function. This tutorial will discuss theTypeError: can only join an itera...