seawinde commented on code in PR #59594:
URL: https://github.com/apache/doris/pull/59594#discussion_r2666928919


##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/exploration/mv/AbstractMaterializedViewRule.java:
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@@ -371,7 +373,7 @@ protected List<Plan> doRewrite(StructInfo queryStructInfo, 
CascadesContext casca
                     return rewriteResults;
                 }
                 boolean partitionNeedUnion = 
PartitionCompensator.needUnionRewrite(invalidPartitions, cascadesContext);
-                boolean canUnionRewrite = canUnionRewrite(queryPlan,
+                canUnionRewrite = canUnionRewrite && canUnionRewrite(queryPlan,

Review Comment:
   Hi, Using materialized views for transparent query rewriting should ensure 
data correctness unless the user explicitly specifies that incorrect data is 
allowed. This behavior change is reasonable. Also, a side question: Why is 
union rewrite disabled for materialized views using external tables?



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