morningman commented on code in PR #63505:
URL: https://github.com/apache/doris/pull/63505#discussion_r3295807527


##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/AlterWorkloadGroupCommand.java:
##########
@@ -82,21 +82,21 @@ public void doRun(ConnectContext ctx, StmtExecutor 
executor) throws Exception {
             throw new AnalysisException(WorkloadGroup.COMPUTE_GROUP + " can 
not be set in property.");
         }
 
-        ComputeGroup cg = null;
+        ComputeGroup cg;
         if (Config.isCloudMode()) {
             if (StringUtils.isEmpty(computeGroup)) {
-                computeGroup = Tag.VALUE_DEFAULT_COMPUTE_GROUP_NAME;
+                throw new UserException("Must specify compute group via 'FOR 
<compute_group>' "
+                        + "in cloud mode.");
             }
-            String cgName = computeGroup;
-            cg = 
Env.getCurrentEnv().getComputeGroupMgr().getComputeGroupByName(cgName);
+            cg = 
Env.getCurrentEnv().getComputeGroupMgr().getComputeGroupByName(computeGroup);
             if (cg == null) {
-                throw new UserException("Can not find compute group:" + 
cgName);
+                throw new UserException("Can not find compute group:" + 
computeGroup);
             }
         } else {
-            if (StringUtils.isEmpty(computeGroup)) {
-                computeGroup = Tag.DEFAULT_BACKEND_TAG.value;
+            if (!StringUtils.isEmpty(computeGroup)) {

Review Comment:
   fixed



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