Merge branch 'branch-0.4.0' into 'branch-0.4.0'

add back knowhere

See merge request megasearch/milvus!322

Former-commit-id: f247a9710d8574268296b2825199c7411b84cf9e

.gitignore

@@ -3,6 +3,7 @@ cpp/cmake-build-debug/
 cpp/cmake-build-release/
 cpp/cmake_build
 cpp/.idea/
+cpp/thirdparty/knowhere_build
 
 .idea/
 .ycm_extra_conf.py

cpp/src/server/grpc_impl/RequestTask.cpp

@@ -107,6 +107,8 @@ CreateTableTask::CreateTableTask(const ::milvus::grpc::TableSchema& schema)
 
 BaseTaskPtr
 CreateTableTask::Create(const ::milvus::grpc::TableSchema& schema) {
+//    BaseTaskPtr create_table_task_ptr = std::make_shared<CreateTableTask>(schema);
+//    return create_table_task_ptr;
     return std::shared_ptr<BaseTask>(new CreateTableTask(schema));
 }
 

knowhere @ 98c56500

+Subproject commit 98c56500b5b26a3502e2fea474586267ac6625f0