MS-151 Fix topk problem

Former-commit-id: 40f952e4c6e1ed9f5ca3a300601c51d410c8e86b

cpp/src/db/FaissExecutionEngine.cpp

@@ -138,7 +138,6 @@ Status FaissExecutionEngine::Search(long n,
     auto start_time = METRICS_NOW_TIME;
 
     std::shared_ptr<faiss::IndexIVF> ivf_index = std::dynamic_pointer_cast<faiss::IndexIVF>(pIndex_);
-    //ENGINE_LOG_DEBUG << "Index nlist: " << ivf_index->nlist << ", ntotal: "<< ivf_index->ntotal;
     if(ivf_index) {
         ENGINE_LOG_DEBUG << "Index type: IVFFLAT nProbe: " << nprobe_;
         ivf_index->nprobe = nprobe_;

cpp/src/db/scheduler/task/SearchTask.cpp

@@ -167,14 +167,6 @@ std::shared_ptr<IScheduleTask> SearchTask::Execute() {
             ClusterResult(output_ids, output_distence, context->nq(), inner_k, result_set);
             rc.Record("cluster result");
 
-
-            SERVER_LOG_DEBUG << "Query Result: ";
-            for(auto& id2score_vector: result_set) {
-                for(auto& pair: id2score_vector) {
-                    SERVER_LOG_DEBUG << "id: " << pair.first << ", distance: " << pair.second;
-                }
-            }
-
             //step 4: pick up topk result
             TopkResult(result_set, inner_k, context->GetResult());
             rc.Record("reduce topk");