diff --git a/be/src/util/jsonb_document.h b/be/src/util/jsonb_document.h
index b0a725e3819d66c..368088230359d2b 100644
--- a/be/src/util/jsonb_document.h
+++ b/be/src/util/jsonb_document.h
@@ -555,7 +555,7 @@ class JsonbValue {
     int length() const;
 
     //Get the depth of jsonbvalue
-    int base_depth() const;
+    int depth() const;
 
     //Whether to include the jsonbvalue rhs
     bool contains(JsonbValue* rhs) const;
@@ -1272,7 +1272,7 @@ inline int JsonbValue::length() const {
     }
 }
 
-inline int JsonbValue::base_depth() const {
+inline int JsonbValue::depth() const {
     switch (type_) {
     case JsonbType::T_Int8:
     case JsonbType::T_Int16:
@@ -1289,27 +1289,27 @@ inline int JsonbValue::base_depth() const {
         return 1;
     }
     case JsonbType::T_Object: {
-        int depth = 1;
+        int base_depth = 1;
         int numElem = ((ObjectVal*)this)->numElem();
-        if (numElem == 0) return depth;
+        if (numElem == 0) return base_depth;
 
-        int max_depth = depth;
+        int max_depth = base_depth;
 
         for (int i = 0; i < numElem; ++i) {
             JsonbKeyValue* key = ((ObjectVal*)this)->getJsonbKeyValue(i);
             JsonbValue* value = ((ObjectVal*)this)->find(key->getKeyStr(), key->klen());
-            int current_depth = depth + value->base_depth();
+            int current_depth = base_depth + value->depth();
             if (current_depth > max_depth) max_depth = current_depth;
         }
         return max_depth;
     }
     case JsonbType::T_Array: {
-        int depth = 1;
+        int base_depth = 1;
         int numElem = ((ArrayVal*)this)->numElem();
-        if (numElem == 0) return depth;
-        int max_depth = depth + ((ArrayVal*)this)->get(0)->base_depth();
-        for (int i = 1; i < numElem; ++i) {
-            int current_depth = depth + ((ArrayVal*)this)->get(i)->base_depth();
+        if (numElem == 0) return base_depth;
+        int max_depth = base_depth;
+        for (int i = 0; i < numElem; ++i) {
+            int current_depth = base_depth + ((ArrayVal*)this)->get(i)->depth();
             if (current_depth > max_depth) max_depth = current_depth;
         }
         return max_depth;
diff --git a/be/src/vec/functions/function_jsonb.cpp b/be/src/vec/functions/function_jsonb.cpp
index ff7cfac09401acf..9a1716136b0700f 100644
--- a/be/src/vec/functions/function_jsonb.cpp
+++ b/be/src/vec/functions/function_jsonb.cpp
@@ -1329,8 +1329,7 @@ class FunctionJsonbDepth : public IFunction {
                 res_data[i] = 0;
                 continue;
             }
-            auto depth = value->base_depth();
-            res_data[i] = depth;
+            res_data[i] = value->depth();
         }
 
         block.replace_by_position(