xloya commented on code in PR #4335:
URL: https://github.com/apache/gravitino/pull/4335#discussion_r1700202897


##########
core/src/main/java/org/apache/gravitino/storage/relational/service/CommonMetaService.java:
##########
@@ -37,22 +37,20 @@ public Long getParentEntityIdByNamespace(Namespace 
namespace) {
         !namespace.isEmpty() && namespace.levels().length <= 3,
         "Namespace should not be empty and length should be less than or equal 
to 3.");
     Long parentEntityId = null;
-    for (int level = 0; level < namespace.levels().length; level++) {
-      String name = namespace.level(level);
-      switch (level) {
-        case 0:
-          parentEntityId = 
MetalakeMetaService.getInstance().getMetalakeIdByName(name);
-          continue;
-        case 1:
-          parentEntityId =
-              CatalogMetaService.getInstance()
-                  .getCatalogIdByMetalakeIdAndName(parentEntityId, name);
-          continue;
-        case 2:
-          parentEntityId =
-              
SchemaMetaService.getInstance().getSchemaIdByCatalogIdAndName(parentEntityId, 
name);
-          break;
-      }
+    if (namespace.levels().length > 0) {

Review Comment:
   > @xloya
   > 
   > Thank you for your suggestion. I guess I missed something.
   > 
   > ```
   > if (namespace.levels().length >= 1) {
   >       parentEntityId = 
MetalakeMetaService.getInstance().getMetalakeIdByName(namespace.level(0));
   > }
   > 
   > if (namespace.levels().length >= 2) {
   >       parentEntityId =
   >           CatalogMetaService.getInstance()
   >               .getCatalogIdByMetalakeIdAndName(parentEntityId, 
namespace.level(1));
   > }
   > 
   > if (namespace.levels().length >= 3) {
   >       parentEntityId =
   >           SchemaMetaService.getInstance()
   >               .getSchemaIdByCatalogIdAndName(parentEntityId, 
namespace.level(2));
   > }
   > ```
   > 
   > Is it correct that you mentioned changing it like this? If it is, we will 
proceed with the change like this.
   
   Yes, I think this can better express the Namespace levels:
   ```
   if (namespace.levels().length >= 1) {
         ......
   }
   
   if (namespace.levels().length >= 2) {
         ......
   }
   
   if (namespace.levels().length == 3) {
         ......
   }
   ```



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