diff --git a/internal/storage/stats.go b/internal/storage/stats.go
index ba0a05180c..3ce7c3f972 100644
--- a/internal/storage/stats.go
+++ b/internal/storage/stats.go
@@ -24,9 +24,7 @@ const (
 	maxBloomFalsePositive float64 = 0.005
 )
 
-type Stats interface {
-}
-
+// Int64Stats contains statistics data for int64 column
 type Int64Stats struct {
 	FieldID int64              `json:"fieldID"`
 	Max     int64              `json:"max"`