MS-416 ExecutionEngineImpl::GpuCache has not return value cause crash

Former-commit-id: 298969de85a0a8cb4a4e48da21d45fde30df64d1

cpp/CHANGELOG.md

@@ -7,6 +7,7 @@ Please mark all change in change log and use the ticket from JIRA.
 ## Bug
 - MS-411 - Fix metric unittest linking error
 - MS-412 - Fix gpu cache logical error
+- MS-416 - ExecutionEngineImpl::GpuCache has not return value cause crash
 
 ## Improvement
 - MS-327 - Clean code for milvus

cpp/src/db/engine/ExecutionEngineImpl.cpp

@@ -273,6 +273,8 @@ Status ExecutionEngineImpl::Cache() {
 
 Status ExecutionEngineImpl::GpuCache(uint64_t gpu_id) {
     zilliz::milvus::cache::GpuCacheMgr::GetInstance(gpu_id)->InsertItem(location_, index_);
+
+    return Status::OK();
 }
 
 // TODO(linxj): remove.