seawinde commented on code in PR #49041:
URL: https://github.com/apache/doris/pull/49041#discussion_r2043387886


##########
fe/fe-core/src/main/java/org/apache/doris/alter/Alter.java:
##########
@@ -828,9 +847,10 @@ private void replaceTableInternal(Database db, OlapTable 
origTable, OlapTable ne
             } else {
                 Env.getCurrentRecycleBin().recycleTable(db.getId(), origTable, 
isReplay, isForce, 0);
             }
-
             if (origTable.getType() == TableType.MATERIALIZED_VIEW) {
-                Env.getCurrentEnv().getMtmvService().deregisterMTMV((MTMV) 
origTable);
+                if (!isReplay) {

Review Comment:
   what is the reason that only drop mtmv when isReplay is false.



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