Merge branch 'branch-0.5.0' into 'branch-0.5.0'

Branch 0.5.0

See merge request megasearch/milvus!679

Former-commit-id: 2666d839cd4e4eb1f68b18f6ca1c614612a28b91

cpp/README.md

@@ -121,9 +121,15 @@ $ sudo apt-get install clang-tidy clang-format
 
 $ rm cmake_build/CMakeCache.txt
 ```  
+Check code style
 ```shell
 $ ./build.sh -l
 ```
+To format the code
+```shell
+$ cd cmake_build
+$ make clang-format
+```
 
 ##### Run unit test
 

cpp/build-support/lint_exclusions.txt

@@ -5,4 +5,5 @@
 *thirdparty*
 *easylogging++*
 *SqliteMetaImpl.cpp
-*src/grpc*
\ No newline at end of file
+*src/grpc*
+*milvus/include*
\ No newline at end of file

cpp/src/utils/ValidationUtil.cpp

@@ -99,7 +99,7 @@ ValidationUtil::ValidateTableIndexType(int32_t index_type) {
 Status
 ValidationUtil::ValidateTableIndexNlist(int32_t nlist) {
     if (nlist <= 0) {
-        std::string msg = "Invalid nlist value: " + std::to_string(nlist);
+        std::string msg = "nlist value should be greater than 0";
         SERVER_LOG_ERROR << msg;
         return Status(SERVER_INVALID_INDEX_NLIST, msg);
     }
@@ -132,7 +132,7 @@ ValidationUtil::ValidateTableIndexMetricType(int32_t metric_type) {
 Status
 ValidationUtil::ValidateSearchTopk(int64_t top_k, const engine::meta::TableSchema& table_schema) {
     if (top_k <= 0 || top_k > 2048) {
-        std::string msg = "Invalid top k value: " + std::to_string(top_k);
+        std::string msg = "Invalid top k value: " + std::to_string(top_k) + ", rational range [1, 2048]";
         SERVER_LOG_ERROR << msg;
         return Status(SERVER_INVALID_TOPK, msg);
     }
@@ -143,7 +143,8 @@ ValidationUtil::ValidateSearchTopk(int64_t top_k, const engine::meta::TableSchem
 Status
 ValidationUtil::ValidateSearchNprobe(int64_t nprobe, const engine::meta::TableSchema& table_schema) {
     if (nprobe <= 0 || nprobe > table_schema.nlist_) {
-        std::string msg = "Invalid nprobe value: " + std::to_string(nprobe);
+        std::string msg = "Invalid nprobe value: " + std::to_string(nprobe) + ", rational range [1, " +
+                          std::to_string(table_schema.nlist_) + "]";
         SERVER_LOG_ERROR << msg;
         return Status(SERVER_INVALID_NPROBE, msg);
     }