shuke987 commented on code in PR #65453:
URL: https://github.com/apache/doris/pull/65453#discussion_r3567690367


##########
regression-test/plugins/plugin_index_change.groovy:
##########
@@ -51,20 +55,24 @@ Suite.metaClass.build_index_on_table = {index_name, 
table_name ->
 }
 
 Suite.metaClass.wait_for_last_col_change_finish = { table_name, OpTimeout ->
-    def useTime = 0
+    def finished = false
+    def alter_res = ""
 
-    for (int t = delta_time; t <= OpTimeout; t += delta_time) {
-        def alter_res = sql """SHOW ALTER TABLE COLUMN WHERE TableName = 
"${table_name}" ORDER BY CreateTime DESC LIMIT 1;"""
+    for (int t = 0; t <= OpTimeout; t += delta_time) {
+        alter_res = sql """SHOW ALTER TABLE COLUMN WHERE TableName = 
"${table_name}" ORDER BY CreateTime DESC LIMIT 1;"""
         alter_res = alter_res.toString()
         if (alter_res.contains("FINISHED")) {
             sleep(3000) // wait change table state to normal
             logger.info(table_name + " latest alter job finished, detail: " + 
alter_res)
+            finished = true
+            break
+        }
+        if (t >= OpTimeout) {
             break
         }
-        useTime = t
         sleep(delta_time)
     }
-    assertTrue(useTime <= OpTimeout, "wait_for_last_col_change_finish timeout")
+    assertTrue(finished, "wait_for_last_col_change_finish timeout, latest 
result: ${alter_res}")
 }
 
 Suite.metaClass.wait_for_last_schema_change_finish = {table_name, OpTimeout ->

Review Comment:
   Follow-up fixed in 3cd514f11ef after inspecting P0 991501 and Cloud P0 
991624. Direct shared-helper callers also legitimately see an empty SHOW BUILD 
INDEX result when no build-index job exists. The helper now returns immediately 
for an empty result, while remaining strict for existing nonterminal jobs. Mock 
coverage includes the empty-result path.



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