liuzqt commented on code in PR #49715:
URL: https://github.com/apache/spark/pull/49715#discussion_r1944199164


##########
sql/core/src/test/scala/org/apache/spark/sql/execution/adaptive/AdaptiveQueryExecSuite.scala:
##########
@@ -3048,6 +3047,49 @@ class AdaptiveQueryExecSuite
     checkAnswer(unionDF.select("id").distinct(), Seq(Row(null)))
   }
 
+  test("Collect twice on the same dataframe with no AQE plan changes") {
+    val df = spark.sql("SELECT * FROM testData join testData2 ON key = a")
+    df.collect()
+    val plan1 = 
df.queryExecution.executedPlan.asInstanceOf[AdaptiveSparkPlanExec].executedPlan
+    df.collect()
+    val plan2 = 
df.queryExecution.executedPlan.asInstanceOf[AdaptiveSparkPlanExec].executedPlan
+    assert(plan1.isInstanceOf[ResultQueryStageExec])
+    assert(plan2.isInstanceOf[ResultQueryStageExec])
+    assert(plan1 ne plan2)
+    assert(plan1.asInstanceOf[ResultQueryStageExec].plan
+      .fastEquals(plan2.asInstanceOf[ResultQueryStageExec].plan))
+  }
+
+  test("Two different collect actions on same dataframe") {
+    val df = spark.sql("SELECT * FROM testData join testData2 ON key = a")
+    val adaptivePlan = 
df.queryExecution.executedPlan.asInstanceOf[AdaptiveSparkPlanExec]
+    val res1 = adaptivePlan.execute().collect()
+    val plan1 = adaptivePlan.executedPlan
+    val res2 = adaptivePlan.executeTake(1)
+    val plan2 = adaptivePlan.executedPlan
+    assert (res1.length != res2.length)
+    assert(plan1.isInstanceOf[ResultQueryStageExec])
+    assert(plan2.isInstanceOf[ResultQueryStageExec])
+    assert(plan1 ne plan2)
+    assert(plan1.asInstanceOf[ResultQueryStageExec].plan
+      .fastEquals(plan2.asInstanceOf[ResultQueryStageExec].plan))
+  }
+
+  test("Collect twice on AQE plan change from SMJ to BHJ") {

Review Comment:
   I think this test is irrelevant...removed it



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