[fix](cloud) Fix regression case test_nereids_row_policy run in clo…

…ud mode (apache#31726)

regression-test/suites/account_p0/test_nereids_row_policy.groovy

@@ -21,6 +21,18 @@ suite("test_nereids_row_policy") {
     def user='row_policy_user'
     def tokens = context.config.jdbcUrl.split('/')
     def url=tokens[0] + "//" + tokens[2] + "/" + dbName + "?"
+    def isCloudMode = {
+        def ret = sql_return_maparray  """show backends"""
+        ret.Tag[0].contains("cloud_cluster_name")
+    }
+    def cloudMode = isCloudMode.call()
+    //cloud-mode
+    if (cloudMode) {
+        def clusters = sql " SHOW CLUSTERS; "
+        assertTrue(!clusters.isEmpty())
+        def validCluster = clusters[0][0]
+        sql """GRANT USAGE_PRIV ON CLUSTER ${validCluster} TO ${user}""";
+    }
 
     def assertQueryResult = { size ->
         def result1 = connect(user=user, password='123abc!@#', url=url) {
@@ -83,6 +95,14 @@ suite("test_nereids_row_policy") {
 
     sql 'sync'
 
+    //cloud-mode
+    if (cloudMode) {
+        def clusters = sql " SHOW CLUSTERS; "
+        assertTrue(!clusters.isEmpty())
+        def validCluster = clusters[0][0]
+        sql """GRANT USAGE_PRIV ON CLUSTER ${validCluster} TO ${user}""";
+    }
+
     // no policy
     assertQueryResult 3