resolve the remaining comments in PR#25295

Author: JkSelf

sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeLocalShuffleReader.scala

@@ -61,7 +61,7 @@ case class OptimizeLocalShuffleReader(conf: SQLConf) extends Rule[SparkPlan] {
     val numExchangeAfter = numExchanges(EnsureRequirements(conf).apply(optimizedPlan))
 
     if (numExchangeAfter > numExchangeBefore) {
-      logWarning("OptimizeLocalShuffleReader rule is not applied due" +
+      logDebug("OptimizeLocalShuffleReader rule is not applied due" +
         " to additional shuffles will be introduced.")
       plan
     } else {

sql/core/src/test/scala/org/apache/spark/sql/execution/adaptive/AdaptiveQueryExecSuite.scala

@@ -229,6 +229,8 @@ class AdaptiveQueryExecSuite
       assert(smj.size == 3)
       val bhj = findTopLevelBroadcastHashJoin(adaptivePlan)
       assert(bhj.size == 2)
+      checkNumLocalShuffleReaders(adaptivePlan, 1)
+      // Even with local shuffle reader, the query statge reuse can also work.
       val ex = findReusedExchange(adaptivePlan)
       assert(ex.size == 1)
     }