From 43b99ddd7a346b5a936bddfcdf7b56b40c370d3b Mon Sep 17 00:00:00 2001
From: seawinde <wusi@selectdb.com>
Date: Wed, 25 Jun 2025 14:50:47 +0800
Subject: [PATCH] [fix](mtmv) Fix compensate union all wrongly when partition
 mv use partition external table (#52218)

Fix compensate union all wrongly when partition mv use partition
external table

in test mv/external_table/part_partition_invalid.groovy
order_qt_after_modify_data_and_refresh_catalog data should be as
following:
```
1	2	1	2023-10-17	2023-10-17
2	2	2	2023-10-18	2023-10-18
3	2	3	2023-10-19	2023-10-19
```


### What problem does this PR solve?

Issue Number: close #xxx

Related PR: #49514

Problem Summary:

### Release note

None

### Check List (For Author)

- Test <!-- At least one of them must be included. -->
    - [ ] Regression test
    - [ ] Unit Test
    - [ ] Manual test (add detailed scripts or steps below)
    - [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
        - [x] Previous test can cover this change.
        - [ ] No code files have been changed.
        - [ ] Other reason <!-- Add your reason?  -->

- Behavior changed:
    - [ ] No.
    - [ ] Yes. <!-- Explain the behavior change -->

- Does this need documentation?
    - [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
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### Check List (For Reviewer who merge this PR)

- [ ] Confirm the release note
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---
 .../nereids/rules/exploration/mv/PartitionCompensator.java    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/exploration/mv/PartitionCompensator.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/exploration/mv/PartitionCompensator.java
index 0ee88ce82a..ecb3c1d6cb 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/exploration/mv/PartitionCompensator.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/exploration/mv/PartitionCompensator.java
@@ -85,8 +85,10 @@ public class PartitionCompensator {
         }
         MTMVPartitionInfo mvCustomPartitionInfo = mtmv.getMvPartitionInfo();
         BaseTableInfo relatedPartitionTable = mvCustomPartitionInfo.getRelatedTableInfo();
-        if (relatedPartitionTable == null || queryUsedBaseTablePartitionNameSet.isEmpty()) {
+        if (relatedPartitionTable == null || queryUsedBaseTablePartitionNameSet.isEmpty()
+                || !relatedPartitionTable.isInternalTable()) {
             // if mv is not partitioned or query not query any partition, doesn't compensate
+            // in 2.1, external table should not compensate union all
             return Pair.of(ImmutableMap.of(), ImmutableMap.of());
         }
         Collection<Partition> mvValidPartitions = cascadesContext.getStatementContext()