[CARMEL-6532] Fix NoSuchElementException in HandleOuterJoinBuildSideSkew (#1220)

Author: wangyum

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

@@ -69,7 +69,7 @@ object HandleOuterJoinBuildSideSkew extends Rule[LogicalPlan]
       case join @ ExtractEquiJoinKeys(LeftOuter, leftKeys, rightKeys, _,
           left @ LogicalQueryStage(_, stage1: ShuffleQueryStageExec),
           right @ LogicalQueryStage(_, stage2: ShuffleQueryStageExec), _)
-        if stage1.isMaterialized && stage2.isMaterialized &&
+        if stage1.isMaterialized && stage2.isMaterialized && stage2.mapStats.nonEmpty &&
           !canPlanAsBroadcastHashJoin(join, conf) && !containsBloomFilter(right) =>
         val rightSize = stage2.mapStats.get.bytesByPartitionId
         val rightSideMaxSize = rightSize.max