morrySnow commented on code in PR #44726:
URL: https://github.com/apache/doris/pull/44726#discussion_r1879883501


##########
fe/fe-core/src/main/java/org/apache/doris/datasource/iceberg/IcebergExternalTable.java:
##########
@@ -51,9 +108,63 @@ protected synchronized void makeSureInitialized() {
         }
     }
 
+    @VisibleForTesting
+    public void setTable(Table table) {
+        this.table = table;
+    }
+
+    @VisibleForTesting
+    public void setPartitionColumns(List<Column> partitionColumns) {
+        this.partitionColumns = partitionColumns;
+    }
+
+    @VisibleForTesting
+    public List<Column> getSchema() {
+        Schema schema = table.schema();
+        List<Types.NestedField> columns = schema.columns();
+        List<Column> tmpSchema = 
Lists.newArrayListWithCapacity(columns.size());
+        for (Types.NestedField field : columns) {
+            tmpSchema.add(new Column(field.name().toLowerCase(Locale.ROOT),

Review Comment:
   why to lowercase?



##########
fe/fe-core/src/main/java/org/apache/doris/job/extensions/mtmv/MTMVTask.java:
##########
@@ -176,6 +177,11 @@ public void run() throws JobException {
             this.relation = MTMVPlanUtil.generateMTMVRelation(mtmv, ctx);
             beforeMTMVRefresh();
             if (mtmv.getMvPartitionInfo().getPartitionType() != 
MTMVPartitionType.SELF_MANAGE) {
+                MTMVRelatedTableIf relatedTable = 
mtmv.getMvPartitionInfo().getRelatedTable();
+                if (!relatedTable.isValidRelatedTable()) {
+                    throw new JobException("MTMV " + mtmv.getName() + "'s 
related table " + relatedTable.getName()
+                        + " is not a valid related table anymore, stop 
refreshing.");

Review Comment:
   could we also print invalid reason here?



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