From b9912c904516163626a9ee2392b10a8310e9bb22 Mon Sep 17 00:00:00 2001
From: shuke <37901441+shuke987@users.noreply.github.com>
Date: Sun, 12 Jul 2026 11:08:58 +0800
Subject: [PATCH] [fix](regression) Stabilize sync MV selection in MTMV test

### What problem does this PR solve?

Issue Number: close #xxx

Related PR: #37396

Problem Summary: The test verifies that an async MTMV can read a sync rollup and resolve its partition column back to the base table. After the old non-cost-based sync MV control was removed, TRY_IN_RBO could successfully generate the rollup candidate while cost-based planning still selected the base index. Add USE_MV to both the precondition query and the MTMV definition so the test deterministically exercises the intended sync-rollup path.

### Release note

None

### Check List (For Author)

- Test: Groovy parse and git diff --check
    - Regression test syntax validation
- Behavior changed: No
- Does this need documentation: No
---
 .../suites/rollup_p0/test_create_mv_and_mtmv.groovy        | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/regression-test/suites/rollup_p0/test_create_mv_and_mtmv.groovy b/regression-test/suites/rollup_p0/test_create_mv_and_mtmv.groovy
index b8c3639fb42841..1efa00f71be4ee 100644
--- a/regression-test/suites/rollup_p0/test_create_mv_and_mtmv.groovy
+++ b/regression-test/suites/rollup_p0/test_create_mv_and_mtmv.groovy
@@ -52,9 +52,10 @@ suite("test_create_mv_and_mtmv") {
                  dt;
 
     """)
+    // The MTMV must read the sync MV to cover partition-column resolution through the rollup.
     explain {
         sql("""
-                    SELECT dt,advertiser,
+                    SELECT /*+ use_mv(${tableName}.${mvName}) */ dt,advertiser,
                           count(DISTINCT user_id)
                     FROM ${tableName}
                     GROUP BY dt,advertiser""")
@@ -68,7 +69,7 @@ suite("test_create_mv_and_mtmv") {
             DISTRIBUTED BY RANDOM BUCKETS 1
             PROPERTIES ('replication_num' = '1') 
             AS 
-            select dt, advertiser, count(distinct user_id)
+            select /*+ use_mv(${tableName}.${mvName}) */ dt, advertiser, count(distinct user_id)
                 from ${tableName}
                 group by dt, advertiser;
     """
@@ -109,4 +110,4 @@ AND RefreshMode = '${refreshMode}';"""
     sql """ DROP TABLE IF EXISTS ${tableName} """
     sql """ DROP MATERIALIZED VIEW IF EXISTS ${mtmvName} """
 
-}
\ No newline at end of file
+}