caiconghui commented on a change in pull request #5395:
URL: https://github.com/apache/incubator-doris/pull/5395#discussion_r584452306



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File path: fe/fe-core/src/main/java/org/apache/doris/alter/Alter.java
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@@ -230,16 +230,6 @@ public void processAlterTable(AlterTableStmt stmt) throws 
UserException {
         List<AlterClause> alterClauses = Lists.newArrayList();
         // some operations will take long time to process, need to be done 
outside the table lock
         boolean needProcessOutsideTableLock = false;
-
-        // check conflict alter ops first

Review comment:
       > Why do we needn't check conflict alter ops first?
   
   alterClauses is always empty here, so check conflict alter ops makes no 
sense here.  in processAlterOlapTable and processAlterExternalTable will check 
conflict alter ops




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