enhance: Add nilness linter and fix some small issues (#34049)

Add `nilness` for govet linter and fixed some detected issues

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

.golangci.yml

@@ -41,6 +41,9 @@ linters-settings:
       - default
       - prefix(github.com/milvus-io)
     custom-order: true
+  govet:
+    enable: # add extra linters
+      - nilness 
   gofumpt:
     lang-version: "1.18"
     module-path: github.com/milvus-io

internal/indexnode/task_analyze.go

@@ -74,10 +74,6 @@ func (at *analyzeTask) Execute(ctx context.Context) error {
 		zap.Int64("partitionID", at.req.GetPartitionID()), zap.Int64("fieldID", at.req.GetFieldID()))
 
 	log.Info("Begin to build analyze task")
-	if err != nil {
-		log.Warn("create analyze info failed", zap.Error(err))
-		return err
-	}
 
 	storageConfig := &clusteringpb.StorageConfig{
 		Address:          at.req.GetStorageConfig().GetAddress(),
@@ -103,19 +99,11 @@ func (at *analyzeTask) Execute(ctx context.Context) error {
 		numRows := stats.GetNumRows()
 		numRowsMap[segID] = numRows
 		log.Info("append segment rows", zap.Int64("segment id", segID), zap.Int64("rows", numRows))
-		if err != nil {
-			log.Warn("append segment num rows failed", zap.Error(err))
-			return err
-		}
 		insertFiles := make([]string, 0, len(stats.GetLogIDs()))
 		for _, id := range stats.GetLogIDs() {
 			path := metautil.BuildInsertLogPath(at.req.GetStorageConfig().RootPath,
 				at.req.GetCollectionID(), at.req.GetPartitionID(), segID, at.req.GetFieldID(), id)
 			insertFiles = append(insertFiles, path)
-			if err != nil {
-				log.Warn("append insert binlog path failed", zap.Error(err))
-				return err
-			}
 		}
 		segmentInsertFilesMap[segID] = &clusteringpb.InsertFiles{InsertFiles: insertFiles}
 	}

internal/proxy/simple_rate_limiter.go

@@ -92,7 +92,7 @@ func (m *SimpleLimiter) Check(dbID int64, collectionIDToPartIDs map[int64][]int6
 	}
 
 	// 2. check database level rate limits
-	if ret == nil && dbID != util.InvalidDBID {
+	if dbID != util.InvalidDBID {
 		dbRateLimiters := m.rateLimiter.GetOrCreateDatabaseLimiters(dbID, newDatabaseLimiter)
 		ret = dbRateLimiters.Check(rt, n)
 		if ret != nil {

internal/querynodev2/segments/mock_data.go

@@ -465,7 +465,7 @@ func SaveBinLog(ctx context.Context,
 
 		k := JoinIDPath(collectionID, partitionID, segmentID, fieldID)
 		key := path.Join(chunkManager.RootPath(), "stats-log", k)
-		kvs[key] = blob.Value[:]
+		kvs[key] = blob.Value
 		statsBinlog = append(statsBinlog, &datapb.FieldBinlog{
 			FieldID: fieldID,
 			Binlogs: []*datapb.Binlog{{LogPath: key}},
@@ -653,7 +653,7 @@ func SaveDeltaLog(collectionID int64,
 	key := JoinIDPath(collectionID, partitionID, segmentID, pkFieldID)
 	// keyPath := path.Join(defaultLocalStorage, "delta-log", key)
 	keyPath := path.Join(cm.RootPath(), "delta-log", key)
-	kvs[keyPath] = blob.Value[:]
+	kvs[keyPath] = blob.Value
 	fieldBinlog = append(fieldBinlog, &datapb.FieldBinlog{
 		FieldID: pkFieldID,
 		Binlogs: []*datapb.Binlog{{

internal/storage/azure_object_storage.go

@@ -174,13 +174,6 @@ func (b *BlobReader) Seek(offset int64, whence int) (int64, error) {
 }
 
 func (AzureObjectStorage *AzureObjectStorage) GetObject(ctx context.Context, bucketName, objectName string, offset int64, size int64) (FileReader, error) {
-	opts := azblob.DownloadStreamOptions{}
-	if offset > 0 {
-		opts.Range = azblob.HTTPRange{
-			Offset: offset,
-			Count:  size,
-		}
-	}
 	return NewBlobReader(AzureObjectStorage.Client.NewContainerClient(bucketName).NewBlockBlobClient(objectName), offset)
 }
 

internal/storage/print_binlog_test.go

@@ -441,10 +441,10 @@ func TestPrintDDFiles(t *testing.T) {
 	dropPartitionString, err := proto.Marshal(&dropPartitionReq)
 	assert.NoError(t, err)
 	ddRequests := []string{
-		string(createCollString[:]),
+		string(createCollString),
-		string(dropCollString[:]),
+		string(dropCollString),
-		string(createPartitionString[:]),
+		string(createPartitionString),
-		string(dropPartitionString[:]),
+		string(dropPartitionString),
 	}
 	eventTypeCodes := []EventTypeCode{
 		CreateCollectionEventType,